CN112851277A - Magnesium-cinder-based novel paving and mining filling material and preparation method thereof - Google Patents

Magnesium-cinder-based novel paving and mining filling material and preparation method thereof Download PDF

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CN112851277A
CN112851277A CN202110328722.XA CN202110328722A CN112851277A CN 112851277 A CN112851277 A CN 112851277A CN 202110328722 A CN202110328722 A CN 202110328722A CN 112851277 A CN112851277 A CN 112851277A
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slag
magnesium
optimized
magnesium slag
cinder
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刘浪
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Xi'an Fuer Lvchuang Mining Technology Co Ltd
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Xi'an Fuer Lvchuang Mining Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/08—Slag cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
    • C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Road Paving Structures (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a magnesium-cinder-based novel paving and mining filling material and a preparation method thereof, wherein the material comprises the following raw materials in percentage by weight: 15-50% of magnesium-cinder-based cementing material, 50-85% of aggregate and 0-5% of additive; the magnesium-cinder-based cementing material is a cementing material which is prepared by taking magnesium cinder as a basic raw material and adding one or two of fly ash and gasified cinder; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer. The invention provides a new utilization approach for solid waste disposal in two major pillar industries of coal chemical industry and magnesium smelting, and realizes solid waste recycling.

Description

Magnesium-cinder-based novel paving and mining filling material and preparation method thereof
Technical Field
The invention belongs to the technical field of solid waste recycling, and particularly relates to a magnesium-coal slag-based novel paving and mining filling material and a preparation method thereof.
Background
The magnesium metal and the alloy thereof as 'green engineering materials in the 21 st century' have important positions in the economic development of China. By 2019, the raw magnesium yield in China is 96.9 ten thousand tons, but the magnesium metal production in China mainly adopts the Pidgeon method, 6-8 tons of magnesium slag waste is generated when 1 ton of magnesium is produced, and hot magnesium slag expands and pulverizes in the cooling process to generate a large amount of dust, thereby seriously polluting the local environment. The existing patents all use the unmodified magnesium slag, and the problems of complex magnesium slag activity excitation process, high transportation cost and the like generally exist. Although the pulverization problem of the Chinese patent CN103011472 is solved by optimizing the magnesium slag, how to utilize the resource is urgently needed to be solved.
In the prior art, the magnesium slag disposal mode is mainly landfill, and generally a slag yard is built after anti-seepage treatment by utilizing natural gullies, landfill is carried out, and the surface is reclaimed after landfill; occupies a large amount of land, has the hidden trouble of seriously polluting atmosphere, water source and earth surface ecology, and simultaneously, a large amount of magnesium slag is buried, thus causing great waste of resources.
Cement is the most mature cementing material in technical development and the most used amount in the world today, but the high cost of cement limits its popularization in some industries with low strength requirements or low profit margins, such as filling mining of cheap metal ores and coal filling mining, etc. In order to reduce the cost, the industry uses the industrial waste residues such as fly ash, magnesium slag, gasified slag, steel slag and the like as mixed materials and admixtures to replace part of cement, but still has the problem of high cost.
The magnesium slag contains high MgO, and after the magnesium slag is mixed into cement, high-content unhydrated free MgO, namely unstable components, can remain, and the free MgO gradually hydrates and expands along with the passage of time, so that a solidified body cracks and even falls off, and the strength is obviously reduced.
In order to reduce the cost of cement raw materials, some waste residues are often blended as raw materials.
Chinese patent CN101492260A discloses a magnesium slag portland cement and its manufacturing method, the main ingredients are cement clinker, gypsum, magnesium slag, and its disadvantage is that magnesium slag can only be used as admixture, and can not be completely separated from cement clinker.
Chinese patent CN1715232 discloses a method for producing cement clinker by using waste slag from magnesium smelting, the main ingredients are gypsum, magnesium slag, limestone, clay, iron ore, anthracite and fluorite, but the method requires a cement firing process, has high energy consumption, and has the defect that the content of MgO in the magnesium waste slag is limited to 6-10% of the total weight, and other raw materials are not industrial solid wastes.
Chinese patent CN101417867 discloses a method for manufacturing magnesium silicate slag cement by using magnesium slag, which still uses magnesium slag as admixture to be mixed into cement clinker.
Chinese patent CN103435281A discloses a cement clinker and its preparation process, the main raw materials include limestone, sandstone powder, magnesium slag, fly ash and copper slag, but the patent also needs a cement firing process, and the energy consumption is large.
Chinese patent CN102432206A discloses a chemical excitation magnesium slag-based geopolymer cementing material and a preparation method thereof, wherein magnesium slag and slag which can provide aluminosilicate components are used as raw materials, and a chemical excitation agent sodium silicate is added to prepare the cementing material.
Chinese patent CN110318802A discloses a magnesium slag cementing material and a forming process method thereof, wherein the raw materials comprise water, sodium bicarbonate and magnesium slag, but the magnesium slag cementing material is used for independently binding and forming the magnesium slag, so that the porosity of the material is reduced, and the strength is not high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel magnesium-coal slag-based paving and mining filling material which can provide a new utilization way for solid waste disposal in two major pillar industries of coal chemical industry and magnesium smelting and a preparation method thereof aiming at the defects in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following raw materials in percentage by weight: 15-50% of magnesium-cinder-based cementing material, 50-85% of aggregate and 0-5% of additive; the magnesium-cinder-based cementing material is a cementing material which is prepared by taking magnesium cinder as a basic raw material and adding one or two of fly ash and gasified cinder; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
The magnesium-cinder-based novel paving and mining filling material is characterized in that: the magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%.
The invention also provides a preparation method of the magnesium-cinder-based novel paving and mining filling material, which is characterized by comprising the following steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material; the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
202, mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
and step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: in step 202, the specific process of mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance and grinding into the magnesium-coal slag-based novel paving and mining filling material comprises the following steps:
2021, weighing and optimizing the magnesium slag, the fly ash and the activator in proportion and mixing; the optimized magnesium slag, the fly ash and the activator comprise the following components in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step 2022, pouring the mixture into a ball mill for grinding to obtain the magnesium-coal slag-based novel paving and mining filling material.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: before the step 202, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance is specifically as follows:
step A1, selecting optimized magnesium slag, fly ash and an activating agent with different weight percentage contents within the optimized magnesium slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the fly ash and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step A2, inputting optimized magnesium slag, fly ash and activating agent with different weight percentages into a Tensorflow network according to a pre-trained optimal proportion by combining different days to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
and A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the fly ash and the activator.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: before the step 202, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance is specifically as follows:
step B1, obtaining the predicted strength parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B11, selecting optimized magnesium slag, fly ash and activating agent with different weight percentage contents within the optimized magnesium slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the fly ash and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step B12, inputting optimized magnesium slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
step B13, according to the formula
Figure BDA0002995546990000031
Normalizing the predicted strength of the magnesium-cinder-based novel paving and mining filling material obtained in the step B12 to obtain a normalized strength value y1nor(ii) a Wherein, y1For the predicted intensity of different days under the mixture ratio of the material, min y1For minimum prediction intensity, max y1Is the maximum predicted intensity;
step B2, obtaining economic index parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B21, respectively setting the unit prices of the optimized magnesium slag, the fly ash and the activator as a1、a2、a3Constructing an economic indicator function as y2＝a1x1+a2x2+a3x3(ii) a Wherein, y2Is an economic indicator, x1Is a coefficient related to the content of the optimized magnesium slag and x1∈(0.5,0.9)，x2Is a coefficient related to the content of fly ash and x2∈(0.1,0.4)，x3Is a coefficient related to the content of the activator and x3∈(0,0.2)；
Step B22, according to the economic index function y2＝a1x1+a2x2+a3x3And x1、x2And x3To solve the maximum value max y of the economic index2And minimum value min y of economic index2；
Step B23, according to the formula
Figure BDA0002995546990000032
Normalizing the economic index obtained in the step B22 to obtain a normalized economic index y2nor；
Step B3, according to the intensity value y after normalization processing1norAnd the normalized economic index y2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure BDA0002995546990000033
Determining the ratio corresponding to the maximum value of the objective function y as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the optimized fly ash and the optimized activator; wherein alpha is1Is a weight coefficient of intensity, alpha2Weight coefficient of economic nature, TH1Is the lowest up-to-standard intensity value of intensity, TH2Is the highest price threshold acceptable in economic indicators.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: the training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 4 nodes, the middle two layers comprise 5 nodes in each layer, and the output layer comprises 1 node; wherein, the 4 nodes of the input layer are respectively the optimized magnesium slag content, the fly ash content, the activator content and the days; 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the fly ash and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
step C3, normalizing the days in the sample data;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
The invention also provides a magnesium-coal slag-based novel paving and mining filling material which is characterized in that the magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by naturally aging or thermally pouring modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintenance and stability maintenance treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30 wt%, gasified slag 50-80 wt% and activator 0-20 wt%.
The invention also provides a preparation method of the magnesium-cinder-based novel paving and mining filling material, which is characterized by comprising the following steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material; the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
step 203, mixing the optimized magnesium slag, the gasified slag and the activating agent according to the content designed in advance, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
and step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: in step 203, the specific process of mixing the optimized magnesium slag, the gasified slag and the activator according to the content designed in advance and grinding the mixture into the magnesium-coal slag-based novel paving and mining filling material comprises the following steps:
step 2031, weighing and optimizing the magnesium slag, the gasified slag and the activator in proportion and mixing; the optimized magnesium slag, the gasified slag and the activator comprise the following components in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
and 2032, pouring the mixture into a ball mill for grinding to obtain the novel magnesium-cinder-based paving and mining filling material.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag and the activator in advance is specifically as follows:
step A1, selecting optimized magnesium slag, gasified slag and activating agent with different weight percentage contents in the optimized magnesium slag, gasified slag and activating agent optimized formula range; the optimized magnesium slag, the gasified slag and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
step A2, inputting optimized magnesium slag, gasified slag and activating agent with different weight percentages into a Tensorflow network according to pre-trained optimal proportion by combining different days to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
and A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the gasified slag and the activator.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag and the activator in advance is specifically as follows:
step B1, obtaining the predicted strength parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B11, selecting optimized magnesium slag, gasified slag and activating agent with different weight percentage contents in the optimized magnesium slag, gasified slag and activating agent optimized formula range; the optimized magnesium slag, the gasified slag and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
step B12, inputting optimized magnesium slag, gasified slag and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
step B13, according to the formula
Figure BDA0002995546990000051
Normalizing the predicted strength of the magnesium-cinder-based novel paving and mining filling material obtained in the step B12 to obtain a normalized strength value y'1nor(ii) a Wherein, y'1Is the predicted intensity in min y 'for different days at the mix ratio of the material'1Is the minimum predicted intensity, max y'1Is the maximum predicted intensity;
step B2, obtaining economic index parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B21, respectively setting the unit prices of the optimized magnesium slag, the gasified slag and the activator as a'1、a′2、a′3Constructing an economic indicator function of y'2＝a′1x′1+a′2x′2+a′3x′3(ii) a Wherein, y'2Is an economic indicator of x'1For and optimizing the content of magnesium slagQuantity related coefficients and x'1∈(0.05,0.3)，x′2Is a coefficient related to the content of gasified slag and x'2∈(0.5,0.8)，x′3Is a coefficient related to the content of activator and x'3∈(0,0.2)；
Step B22, according to an economic indicator function y'2＝a′1x′1+a′2x′2+a′3x′3And x'1、x′2And x'3Obtaining the maximum value max y 'of the economic indicator'2And minimum value of economic indicator min y'2；
Step B23, according to the formula
Figure BDA0002995546990000052
Normalizing the economic indicator obtained in the step B22 to obtain a normalized economic indicator y'2nor；
Step B3, obtaining the normalized intensity value y'1norAnd the economic indicator y 'after normalization treatment'2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure BDA0002995546990000053
Determining the corresponding ratio when the value of the objective function y' is maximum as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the gasified slag and the activator; wherein, alpha'1Is a weight coefficient of intensity, alpha'2Is an economic weight coefficient, TH'1Is the lowest up-to-standard strength value of strength, TH'2Is the highest price threshold acceptable in economic indicators.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: the training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 4 nodes, the middle two layers comprise 5 nodes in each layer, and the output layer comprises 1 node; wherein, the 4 nodes of the input layer respectively optimize the content of magnesium slag, the content of gasified slag, the content of an activating agent and the number of days; 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the gasified slag and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
step C3, normalizing the days in the sample data;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
The invention also provides a magnesium-coal slag-based novel paving and mining filling material which is characterized in that the magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by naturally aging or thermally pouring modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintenance and stability maintenance treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and flyash 5-30%.
The invention also provides a preparation method of the magnesium-cinder-based novel paving and mining filling material, which is characterized by comprising the following steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
step 203, mixing the optimized magnesium slag, the gasified slag and the fly ash according to the content designed in advance to form a waste slag mixture, adding an activating agent, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
and step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
The preparation method of the magnesium-cinder-based novel cementing material is characterized by comprising the following steps of: the specific process of mixing the gasified slag, the optimized magnesium slag and the fly ash, adding the activator and grinding into the magnesium-coal slag-based novel cementing material in the step 203 is as follows:
step 2031, weighing gasified slag, optimizing magnesium slag and fly ash according to a proportion, and mixing to form a waste slag mixture; the coal gasification coarse slag, the optimized magnesium slag and the fly ash comprise the following components in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step 2032, weighing and mixing the waste residue mixture and the activating agent in proportion; the weight percentage content of the waste residue mixture and the activating agent is as follows: 85-100% of waste residue mixture and 0-15% of activating agent;
and 2033, pouring the mixture into a ball mill for grinding to obtain the novel magnesium-coal slag-based paving and mining filling material.
The preparation method of the magnesium-cinder-based novel cementing material is characterized by comprising the following steps of: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag, the fly ash and the activator in advance is specifically as follows:
step A1, selecting optimized magnesium slag, gasified slag, fly ash and an activator with different weight percentage contents within the optimized magnesium slag, gasified slag, fly ash and activator optimized formula range; the optimized magnesium slag, the gasified slag, the fly ash and the activator are preferably prepared from the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step A2, inputting optimized magnesium slag, gasified slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
and A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the gasified slag, the fly ash and the activator.
The preparation method of the magnesium-cinder-based novel cementing material is characterized by comprising the following steps of: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag, the fly ash and the activator in advance is specifically as follows:
step B1, obtaining the predicted strength parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B11, selecting optimized magnesium slag, gasified slag, fly ash and an activating agent with different weight percentage contents within the optimized magnesium slag, gasified slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the gasified slag, the fly ash and the activator are preferably prepared from the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step B12, inputting optimized magnesium slag, gasified slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
step B13, according to the formula
Figure BDA0002995546990000071
Normalizing the predicted strength of the magnesium-cinder-based novel paving and mining filling material obtained in the step B12 to obtain a normalized strength value y ″1nor(ii) a Wherein, y ″)1The predicted intensity of the material in different days, min y ″, is1For minimum prediction intensity, max y ″)1Is the maximum predicted intensity;
step B2, obtaining economic index parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B21, setting the unit prices of the optimized magnesium slag, the gasified slag, the fly ash and the activator as a ″, respectively1、a″2、a″3、a″4Constructing an economic indicator function as y ″)2＝a″1x″1+a″2x″2+a″3x″3+a″4x″4(ii) a Wherein, y ″)2Is an economic indicator, x ″)1Is a coefficient related to the content of the optimized magnesium slag and x ″)1∈(0.05,0.3)，x″2Is a coefficient related to the content of gasified slag and x'2∈(0.6,0.9)，x″3Is a coefficient related to the content of fly ash and x'3∈(0.05,0.3)，x″4Is a coefficient related to the content of activator and x'4∈(0,0.15)；
Step B22, according to an economic indicator function y'2＝a″1x″1+a″2x″2+a″3x″3+a″4x″4And x ″)1、x″2、x″3And x ″)4The maximum value max y of the economic index is solved2And the minimum value min y of the economic indicator2；
Step B23, according to the formula
Figure BDA0002995546990000072
Normalizing the economic indicator obtained in the step B22 to obtain a normalized economic indicator y ″2nor；
Step B3, according to the intensity value y' after normalization processing1norAnd the economic index y' after normalization processing2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure BDA0002995546990000073
Determining the ratio corresponding to the maximum value of the objective function y' as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the gasified slag, the fly ash and the activator; wherein, α ″)1Weight coefficient of intensity, alpha ″)2Is an economic weight coefficient, TH ″)1Is the lowest standard strength value of strength, TH2Is the highest price threshold acceptable in economic indicators.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: the training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 5 nodes, the middle layer comprises two layers, each layer comprises 5 nodes, and the output layer comprises 1 node; wherein, the 5 nodes of the input layer respectively optimize the content of magnesium slag, the content of gasified slag, the content of fly ash, the content of an activator and the number of days; 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the gasified slag, the fly ash and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
step C3, normalizing the days in the sample data;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
The magnesium-cinder-based novel paving and mining filling material is characterized in that: the method for performing activity retention and stability retention treatment on magnesium slag generated by Pidgeon magnesium smelting adopts a method for refining crude magnesium ingots by using modified magnesium smelting pellets to generate modified magnesium slag, wherein the modified magnesium smelting pellets comprise the following raw materials in percentage by weight: 81 to 82.8 percent of calcined dolomite, 15 to 16.6 percent of ferrosilicon, 1.25 to 2.71 percent of fluorite and 0.23 to 0.29 percent of ferroboron; the ferroboron alloy comprises the following elements in percentage by weight: 16 to 20.5 percent of B, 0.5 to 1.0 percent of C, 1.5 to 2.5 percent of Si, 0.05 to 0.5 percent of Al and the balance of Fe.
The magnesium-cinder-based novel paving and mining filling material is characterized in that: the method for producing the modified magnesium slag by using the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
d1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely grinding the raw materials, then passing through a 100-mesh sieve, and pressing undersize materials to obtain the modified magnesium-smelting pellets;
and D2, loading the modified magnesium smelting pellets in the step D1 into a reduction tank, reducing for 7-8 h under the conditions that the vacuum degree is 5-10 Pa and the temperature is 1200-1220 ℃, opening the reduction tank after the reduction is finished, taking out a crude magnesium ingot, and removing magnesium slag in the reduction tank to obtain blocky modified magnesium slag.
The magnesium-cinder-based novel paving and mining filling material is characterized in that: the method for performing activity retention and stability retention treatment on magnesium slag generated by Pidgeon magnesium smelting adopts a method for refining crude magnesium ingots by using modified magnesium smelting pellets to generate modified magnesium slag, wherein the modified magnesium smelting pellets comprise the following raw materials in percentage by weight: 12 to 18 percent of ferrosilicon, 0.5 to 3 percent of fluorite, 0.3 to 3.1 percent of boric acid or borax, and the balance of calcined dolomite.
The magnesium-cinder-based novel paving and mining filling material is characterized in that: the method for producing the modified magnesium slag by using the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
e1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely grinding the raw materials, then passing through a 100-mesh sieve, and pressing undersize materials to obtain the modified magnesium-smelting pellets;
and E2, loading the modified magnesium smelting pellets in the step E2 into a reduction tank, reducing for 6-10 h under the conditions that the vacuum degree is 5-20 Pa and the temperature is 1150-1250 ℃, opening the reduction tank after the reduction is finished, taking out a crude magnesium ingot, and removing magnesium slag in the reduction tank to obtain blocky modified magnesium slag.
The magnesium-cinder-based novel paving and mining filling material is characterized in that: the activating agent is one or more of gypsum, anhydrous sodium sulphate, calcium hydroxide, lime, soda, baking soda, heavy calcium, sodium silicate, polymeric salt, sodium chloride and caustic soda; the gypsum is natural gypsum, phosphogypsum, fluorgypsum or industrial desulfurization gypsum.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: in step 202, the pretreatment of screening, coarse crushing and fine crushing of the coal gasification slag to obtain the coal gasification slag comprises the following specific processes:
step 2021, screening: screening the coal gasification coarse slag by using a vibrating screen to obtain a predetermined grain size meeting the requirement;
step 2022, coarse crushing: coarsely crushing the screened gasified slag by using a jaw crusher;
step 2023, fine crushing: and (4) finely crushing the screened gasified slag by using a double-roller crusher.
The preparation method of the magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following steps of: the specific method for predetermining the particle size meeting the requirement in step 2021 is:
20211, screening the coal gasification coarse slag by using a multistage vibrating screen into multiple stages; the coal gasification coarse slag is coal gasification slag raw slag generated after the coal chemical industry enterprise produces synthesis gas;
20212, measuring the quality and carbon content of the coal gasification coarse slag with different particle size ranges;
step 20213, using the mass as weight, according to the formula
Figure BDA0002995546990000081
Calculating the weighted carbon content omega of the coal gasification coarse slag, determining the particle size range of the coal gasification coarse slag meeting the carbon content requirement according to the national standard GB/T1596-2017 that the ignition loss of the fly ash used for cement or concrete is less than or equal to 8 percent, and determining the particle size range as the particle size meeting the requirement; wherein j is the stage number corresponding to the maximum grain diameter meeting the requirement of carbon content, i is a natural number from 1 to j, and miIs the quality of i-th-stage coal gasification coarse slag, wiThe carbon content of the i-th-stage coal gasification coarse slag is shown.
The invention also provides application of the magnesium-coal slag-based novel paving and mining filling material in paving and mine filling.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, various magnesium-cinder-based cementing materials are prepared by utilizing the mutual excitation effects between the fly ash and the optimized magnesium cinder, between the gasified cinder and the optimized magnesium cinder, and between the fly ash, the gasified cinder and the optimized magnesium cinder, so that the hidden troubles that later-stage concretions crack and fall off and the strength is obviously reduced due to the independent mixing of the magnesium cinder are solved, high-cost cement can be completely replaced, and the cost of the cementing material is greatly reduced; by mixing the magnesium-cinder-based cementing material, the aggregate and the additive, the magnesium-cinder-based novel paving and mining filling material for paving or filling can be prepared, and solid waste recycling is realized.
2. The invention utilizes fly ash and optimized magnesium slag, or gasified slag and optimized magnesium slag, or fly ash, gasified slag and optimized magnesium slag as main materials, and a small amount of activating agent is matched to prepare various magnesium-cinder-based cementing materials, the novel cementing material preparation method takes industrial solid wastes as main materials, and utilizes the mutual excitation effect between fly ash and optimized magnesium slag, between gasified slag and optimized magnesium slag, and between fly ash, gasified slag and optimized magnesium slag to realize the cementing effect of cement-like, eliminate the influence of unstable components (free MgO), and can completely replace cement; in addition, the adopted activator is a common non-toxic and harmless chemical reagent with low price and little addition amount, so the magnesium-coal slag-based cementing material has low cost, can greatly reduce the cost by replacing cement, and simultaneously provides a new utilization way for solid waste disposal in the coal chemical industry and the magnesium smelting industry.
3. According to the invention, the activator is used for inducing the mutual excitation effect between the fly ash and the optimized magnesium slag, between the gasified slag and the optimized magnesium slag, and between the fly ash, the gasified slag and the optimized magnesium slag, so that the hydration speed and the consolidation strength of the mixture are improved, and the problems of long time and low consolidation strength in the middle and early stages of the magnesium-coal slag-based cementing material are solved.
4. The magnesium-cinder based cementing material realizes the resource utilization of solid wastes of three industries of fly ash, gasified cinder and optimized magnesium cinder, and solves the environmental problems of land occupation, air pollution, underground water, surface ecology and the like caused by the treatment of the solid wastes generated in the modern coal chemical industry and magnesium smelting industry in the traditional landfill mode.
5. The preparation method of the magnesium-cinder-based novel paving and mining filling material takes three industrial solid wastes of fly ash, gasified cinder and optimized magnesium cinder as main materials, utilizes the characteristic of higher content of alkaline active substances in the optimized magnesium cinder to excite the activity of volcanic ash substances in the fly ash, also utilizes the characteristic of higher content of aluminosilicate in the fly ash to neutralize the alkaline substances in the optimized magnesium cinder, forms a chain reaction, eliminates the influence of unstable components (free MgO), has high consolidation strength, and can completely replace cement.
6. The preparation method of the magnesium-coal slag-based novel paving and mining filling material realizes resource utilization of waste slag in the modern coal chemical industry and the magnesium smelting industry, and promotes sustainable development of the modern coal chemical industry and the magnesium smelting industry; the magnesium-coal slag-based novel paving and mining filling material has low cost, can be applied to industries such as mine filling, road building and the like, greatly reduces the cost of cementing materials (replacing cement), eliminates the pollution of waste slag stacking to the environment, and has excellent economic benefit and social benefit.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a photomicrograph of a sample of magnesium slag produced in comparative example 1;
FIG. 2 is a photomicrograph of a sample of magnesium slag produced in example 1 of the present invention;
FIG. 3 is an XRD diffraction pattern of a magnesium slag sample produced in example 1 of the present invention and comparative example 1;
FIG. 4 is a bar graph of compressive strength values of magnesium slag cement made from magnesium slag obtained in example 1 of the present invention and magnesium slag cement made from magnesium slag obtained in comparative example 1;
FIG. 5 is a flow chart of the preparation method of the magnesium-cinder-based novel paving and mining filling material.
Detailed Description
The formulation of the modified magnesium-smelting pellets used in the present invention for producing modified magnesium slag and the method for producing modified magnesium slag will be described below with reference to examples 1 to 7; the formulation of the first magnesium-cinder-based cementitious material of the present invention is illustrated by examples 8 to 19; the formulation of the second magnesium-cinder-based cementitious material of the present invention is illustrated by examples 20-30; the formulation of the third magnesium-cinder-based cementitious material of the present invention is illustrated by examples 31 to 41; the formulation of the novel magnesium-cinder-based paving and mining fill material of the present invention is illustrated by examples 42-47; example 48 illustrates a first process for the preparation of a novel magnesium-cinder-based paving and mineral filling material from a first magnesium-cinder-based cementitious material according to the invention; example 49 illustrates a second process for preparing a novel magnesium-cinder-based paving and mineral filling material from the first magnesium-cinder-based cementitious material of the invention; example 50 illustrates a third process for preparing a novel magnesium-cinder-based paving and mineral filling material from the first magnesium-cinder-based cementitious material of the present invention; example 51 illustrates a first process for preparing a novel magnesium-cinder-based paving and mineral filling material from the second magnesium-cinder-based cementitious material of the present invention; example 52 illustrates a second process for preparing a novel magnesium-cinder-based paving and mineral filling material from the second magnesium-cinder-based cementitious material of the present invention; example 53 illustrates a third process for preparing a novel magnesium-cinder-based paving and mineral filling material from the second magnesium-cinder-based cementitious material of the present invention; example 54 illustrates a first method of preparing a novel magnesium-cinder-based paving and mineral filling material from a third magnesium-cinder-based cementitious material in accordance with the present invention; example 55 illustrates a second process for preparing a novel magnesium-cinder-based paving and mineral filling material from a third magnesium-cinder-based cementitious material in accordance with the present invention; example 56 illustrates a third process for preparing a novel magnesium-cinder-based paving and mineral filling material from the third magnesium-cinder-based cementitious material of the present invention; example 57 illustrates the use of the invention in road paving, mine filling.
Example 1
The modified magnesium-smelting pellet of the embodiment comprises the following raw materials in percentage by weight: calcined dolomite (CaO/MgO molar ratio close to 1) 81%, ferrosilicon (Si content about 75%) 16.5%, and fluorite (CaF in fluorite)2Content not less than 95%) 2.25%, ferroboron alloy 0.25%; the weight percentages of all elements in the ferroboron alloy are as follows: b20%, C0.5%, Si 1.5%, Al 0.5%, S<0.01％，P<0.1% and the balance Fe; the granularity of the ferroboron alloy is not more than 5 mm. (refer to GB/T5682-2015 to select ferroboron with the grade of FeB2 0C0.5B.)
The method for producing the modified magnesium slag by adopting the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
d1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely milling, then passing through a 100-mesh sieve, adding the undersize into a ball press, and pressing to obtain the beta-C in the stable magnesium slag2S, modifying the magnesium-smelting pellets;
d2, loading the modified magnesium smelting pellets in the step D1 into a reduction tank, reducing for 7 hours under the conditions that the vacuum degree is 8Pa and the temperature is 1210 ℃, opening the tank after the reduction is finished, taking out a potassium-sodium catcher and a magnesium crystallizer, taking out a coarse magnesium ingot from the magnesium crystallizer, raking out magnesium slag in the reduction tank, and cooling the raked-out magnesium slag to room temperature in a magnesium slag bucket to obtain blocky modified magnesium slag subjected to activity retention and stability retention treatment; after the cover of the reduction tank is opened, air enters the tank, a plurality of micropores exist in the reduced pellets,oxygen in the air can immediately enter the pellet through the micropores to oxidize boron elements in ferroboron into B at the high temperature of about 1000 DEG C2O3. B formed by oxidation2O3Is very active at high temperature, can quickly contact nearby dicalcium orthosilicate and enter crystal lattices of the dicalcium orthosilicate, and then stabilizes beta-C through chemical reaction2S, which makes it unable to convert to gamma-C during cooling2S, such that beta-C is2S becomes a main crystal phase at room temperature and exists in the waste pellets after magnesium smelting. Due to the oxidation of boron element into B2O3And B2O3Stabilising beta-C2The chemical reaction of S is only carried out in the waste magnesium-smelting pellets, and all the production operations after opening the reduction tank, including the work of taking out the potassium-sodium catcher, the magnesium crystallizer, the heat insulation plate and the magnesium slag can be normally carried out without being influenced.
Comparative example 1
The comparative example adopts the traditional Pidgeon process to produce the magnesium pellets, and the weight percentages of the raw materials in the pellets are as follows: 81% forged steel (CaO/MgO molar ratio close to 1), 16.5% ferrosilicon (Si content about 75%), and fluorite (CaF in fluorite)2Content not less than 95%) 2.5%. A crude magnesium ingot was prepared according to the magnesium smelting method of example 1 and magnesium slag was tapped from the reduction vessel and cooled to room temperature in a magnesium slag hopper.
The magnesium slag of comparative example 1 was mostly pulverized as observed after cooling the tapped magnesium slag to room temperature, as shown in fig. 1. The magnesium slag of the embodiment 1 is massive, and the size of most of the magnesium slag is similar to that before the magnesium smelting of the pellets, which is shown in figure 2. XRD analysis was performed on samples of magnesium slag from the two pellet smelting groups of example 1 and comparative example 1, and the results are shown in FIG. 3. As can be seen from the PMS spectrum of FIG. 3(b), the main mineral phase in the magnesium slag produced in comparative example 1 was γ -C2S, this analysis confirmed C2The volume expansion caused by the beta-gamma phase transformation of S (dicalcium orthosilicate) is the main cause of the pulverization of the magnesium slag shown in fig. 1. As can be seen from the MMS chart in FIG. 3(a), the main mineral phase in the magnesium slag produced in example 1 is β -C2And S. Such magnesium slag is not pulverized and substantially maintains its original lump shape (see fig. 2), and thus does not generate dust pollution during transportation and homogenization. By beta-C2The S is a main mineral phase at room temperature, so that the activity of the magnesium slag is greatly improved, and the modified and optimized magnesium slag can be widely applied to cement or concrete, thereby powerfully promoting the energy conservation, emission reduction and sustainable development of metal magnesium and building material production enterprises.
The stability and the compressive strength values of different ages of the magnesium slag cement prepared by using the magnesium slag obtained in the example 1 of the invention and the magnesium slag cement prepared by using the magnesium slag obtained in the comparative example 1 are respectively measured according to a standard method in GB75-2007, wherein the weight percentage of the cement and the magnesium slag in the magnesium slag cement is 65 percent, and the weight percentage of the magnesium slag in the magnesium slag cement is 35 percent. The stability tests of the two magnesium slag cements by the test cake method both obtain qualified results. The results of the compressive strength tests are shown in figure 4, which shows that the 3-day compressive strength values of 2 groups of magnesium slag cements are basically the same, the 28-90-day compressive strength of the magnesium slag cement in example 1 is higher than that of the magnesium slag cement in comparative example 1, especially in two ages of 60 days and 90 days, the compressive strength value of the magnesium slag cement in example 1 is greatly improved compared with that of the magnesium slag cement in comparative example 1, and the fact that the magnesium smelting pellet added with ferroboron can produce modified magnesium slag with high activity as a high-quality admixture for preparing the magnesium-coal slag-based cementing material is confirmed.
Example 2
The modified magnesium-smelting pellet of the embodiment comprises the following raw materials in percentage by weight: calcined dolomite (CaO/MgO molar ratio close to 1) 81.2%, ferrosilicon (Si content about 75%) 16.6%, and fluorite (CaF in fluorite)2Content not less than 95%) 1.94%, ferroboron alloy 0.26%; the weight percentages of all elements in the ferroboron alloy are as follows: 18% of B, 0.5% of C, 1.5% of Si, 0.5% of Al, and S<0.01％，P<0.1% and the balance Fe; the granularity of the ferroboron alloy is not more than 5 mm. (refer to GB/T5682-2015 to select ferroboron with the grade of FeB2 0C0.5B.)
The method for producing the modified magnesium slag by adopting the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
d1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely milling, then passing through a 100-mesh sieve, adding the undersize into a ball press, and pressing to obtain the stable magnesium-smelting pelletsbeta-C in magnesium slag2S, modifying the magnesium-smelting pellets;
d2, loading the modified magnesium smelting pellets in the step D1 into a reduction tank, reducing for 8 hours under the conditions that the vacuum degree is 10Pa and the temperature is 1200 ℃, opening the tank after the reduction is finished, taking out a potassium-sodium catcher and a magnesium crystallizer, taking out a coarse magnesium ingot from the magnesium crystallizer, raking out magnesium slag in the reduction tank, and cooling the raked-out magnesium slag to room temperature in a magnesium slag bucket to obtain blocky modified magnesium slag subjected to activity retention and stability retention treatment; after the cover of the reduction tank is opened, air enters the tank, a plurality of micropores exist in the reduced pellets, oxygen in the air can immediately enter the pellets through the micropores, and boron in ferroboron is oxidized into B at the high temperature of about 1000 DEG C2O3. B formed by oxidation2O3Is very active at high temperature, can quickly contact nearby dicalcium orthosilicate and enter crystal lattices of the dicalcium orthosilicate, and then stabilizes beta-C through chemical reaction2S, which makes it unable to convert to gamma-C during cooling2S, such that beta-C is2S becomes a main crystal phase at room temperature and exists in the waste pellets after magnesium smelting. Due to the oxidation of boron element into B2O3And B2O3Stabilising beta-C2The chemical reaction of S is only carried out in the waste magnesium-smelting pellets, and all the production operations after opening the reduction tank, including the work of taking out the potassium-sodium catcher, the magnesium crystallizer, the heat insulation plate and the magnesium slag can be normally carried out without being influenced.
Comparative example 2
The magnesium smelting pellets adopted in the comparative example comprise the following raw materials in percentage by weight: calcined dolomite (CaO/MgO molar ratio close to 1) 81.2%, ferrosilicon (Si content about 75%) 16.6%, and fluorite (CaF in fluorite)2Content of not less than 95%) 0.5%, anhydrous sodium tetraborate (Na)2B4O7)1.7 percent; a crude magnesium ingot was prepared and a magnesium slag was tapped according to the magnesium smelting method of example 2, and cooled to room temperature in a magnesium slag hopper.
Example 3
The modified magnesium-smelting pellet of the embodiment comprises the following raw materials in percentage by weight: calcined dolomite (CaO/MgO molar ratio close to 1) 82%, ferrosilicon (Si content about 75%) 15%, and fluorite (fluorite)Middle CaF2Content not less than 95%) 2.71%, ferroboron alloy 0.29%; the weight percentages of all elements in the ferroboron alloy are as follows: b16%, C1.0%, Si 2.5%, Al 0.5%, S<0.01％，P<0.1% and the balance Fe; the granularity of the ferroboron alloy is not more than 5 mm. (refer to GB/T5682-2015 for selection of ferroboron with the trademark of FeB 16C1.0.)
The method for producing the modified magnesium slag by adopting the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
d1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely milling, then passing through a 100-mesh sieve, adding the undersize into a ball press, and pressing to obtain the beta-C in the stable magnesium slag2S, modifying the magnesium-smelting pellets;
d2, loading the modified magnesium smelting pellets in the step D1 into a reduction tank, reducing for 7.5h under the conditions that the vacuum degree is 9Pa and the temperature is 1215 ℃, opening the tank after the reduction is finished, taking out a potassium-sodium catcher and a magnesium crystallizer, taking out a coarse magnesium ingot from the magnesium crystallizer, raking out magnesium slag in the reduction tank, and cooling the raked-out magnesium slag to room temperature in a magnesium slag bucket to obtain blocky modified magnesium slag subjected to activity maintaining and stability maintaining treatment; after the cover of the reduction tank is opened, air enters the tank, a plurality of micropores exist in the reduced pellets, oxygen in the air can immediately enter the pellets through the micropores, and boron in ferroboron is oxidized into B at the high temperature of about 1000 DEG C2O3. B formed by oxidation2O3Is very active at high temperature, can quickly contact nearby dicalcium orthosilicate and enter crystal lattices of the dicalcium orthosilicate, and then stabilizes beta-C through chemical reaction2S, which makes it unable to convert to gamma-C during cooling2S, such that beta-C is2S becomes a main crystal phase at room temperature and exists in the waste pellets after magnesium smelting. Due to the oxidation of boron element into B2O3And B2O3Stabilising beta-C2The chemical reaction of S is only carried out in the waste magnesium-smelting pellets, and all the production operations after opening the reduction tank, including the work of taking out the potassium-sodium catcher, the magnesium crystallizer, the heat insulation plate and the magnesium slag can be normally carried out without being influenced.
Comparative example 3
The magnesium smelting pellets adopted in the comparative example comprise the following raw materials in percentage by weight: calcined dolomite (CaO/MgO molar ratio is close to 1) 82%, ferrosilicon (Si content is about 75%) 15%, fluorite (CaF in fluorite)2Content not less than 95%) 1.1%, sodium borate (Na)2B4O7)1.9 percent; a crude magnesium ingot was prepared and a magnesium slag was tapped according to the magnesium smelting method of example 3, and cooled to room temperature in a magnesium slag hopper.
Example 4
The modified magnesium-smelting pellet of the embodiment comprises the following raw materials in percentage by weight: calcined dolomite (CaO/MgO molar ratio close to 1) 82.8%, ferrosilicon (Si content about 75%) 15.72%, and fluorite (CaF in fluorite)2Content not less than 95%) 1.25% and ferroboron alloy 0.23%; the weight percentages of all elements in the ferroboron alloy are as follows: 20.5% of B, 0.5% of C, 1.5% of Si, 0.05% of Al, and S<0.01％，P<0.1% and the balance Fe; the granularity of the ferroboron alloy is not more than 5 mm. (refer to GB/T5682-2015 to select ferroboron with the grade of FeB2 0C0.5A.)
The method for producing the modified magnesium slag by adopting the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
d1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely milling, then passing through a 100-mesh sieve, adding the undersize into a ball press, and pressing to obtain the beta-C in the stable magnesium slag2S, modifying the magnesium-smelting pellets;
d2, loading the modified magnesium smelting pellets in the step D1 into a reduction tank, reducing for 7.9h under the conditions that the vacuum degree is 5Pa and the temperature is 1220 ℃, opening the tank after the reduction is finished, taking out a potassium-sodium catcher and a magnesium crystallizer, taking out a coarse magnesium ingot from the magnesium crystallizer, raking out magnesium slag in the reduction tank, and cooling the raked-out magnesium slag to room temperature in a magnesium slag bucket to obtain blocky modified magnesium slag subjected to activity maintaining and stability maintaining treatment; after the cover of the reduction tank is opened, air enters the tank, a plurality of micropores exist in the reduced pellets, oxygen in the air can immediately enter the pellets through the micropores, and boron in ferroboron is oxidized into B at the high temperature of about 1000 DEG C2O3. B formed by oxidation2O3Is very active at high temperature, can quickly contact nearby dicalcium orthosilicate and enter crystal lattices of the dicalcium orthosilicate, and then stabilizes beta-C through chemical reaction2S, which makes it unable to convert to gamma-C during cooling2S, such that beta-C is2S becomes a main crystal phase at room temperature and exists in the waste pellets after magnesium smelting. Due to the oxidation of boron element into B2O3And B2O3Stabilising beta-C2The chemical reaction of S is only carried out in the waste magnesium-smelting pellets, and all the production operations after opening the reduction tank, including the work of taking out the potassium-sodium catcher, the magnesium crystallizer, the heat insulation plate and the magnesium slag can be normally carried out without being influenced.
Measured beta-C in the Stable magnesium slag of examples 1-3 of the present invention2The modified magnesium-smelting pellets of S and the pellets of comparative examples 1 to 3 were subjected to magnesium-smelting to obtain a feed magnesium ratio (feed magnesium ratio: the weight of the magnesium-smelting pellets/the weight of crude magnesium obtained), and the magnesium slags obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to chemical analysis to obtain analysis values of the magnesium oxide content in these magnesium slag samples. The results are shown in Table 1. (the comparison parameter values used in the following discussion are the average of more than 3 measured or analyzed values under the same conditions.)
TABLE 1 analysis value of MgO (%)
Magnesium smelting pellet Ratio of material to magnesium MgO in the magnesium slag Additive for smelting magnesium pellets
Example 1 5.92 5.21 Ferroboron gold
Comparative example 1 6.23 7.06 Is free of
Example 2 6.05 5.93 Ferroboron gold
Comparative example 2 6.31 6.51 Anhydrous sodium tetraborate
Example 3 6.12 5.65 Ferroboron gold
Comparative example 3 6.28 6.83 Boric acid
As can be seen from the table, the magnesium ratio (5.92-6.12) of the modified magnesium-smelting pellets in the 3 examples is lower than that (6.23-6.31) of the pellets in the comparative example after smelting magnesium. The magnesium oxide content (5.21% to 5.92%) in the magnesium slag samples discharged from the magnesium pelletizing in examples 1 to 3 was also low. The comparison of these parameters shows that ferroboron as additive for smelting magnesium pellets and other materials containing Na which is harmful to Pidgeon magnesium smelting2Of O and water of crystallizationCompared with the additive, the additive can obtain higher MgO reduction rate and Si utilization rate, so that the additive can help reduce cost and improve efficiency, save energy and reduce emission in the Pidgeon magnesium production; in addition, the blocky modified magnesium slag obtained by performing activity maintaining and stability maintaining treatment on the magnesium slag generated by smelting magnesium by the Pidgeon process can be better used for preparing the magnesium-coal slag-based cementing material.
Example 5
The modified magnesium-smelting pellet of the embodiment comprises the following raw materials in percentage by weight: 84.7 percent of forged steel (the molar ratio of CaO/MgO is close to 1), 12 percent of ferrosilicon (the Si content is about 75 percent), 3 percent of fluorite (the content of CaF2 in fluorite is not less than 95 percent) and 0.3 percent of boric acid or borax.
The method for producing the modified magnesium slag by adopting the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
e1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely grinding the raw materials, then passing through a 100-mesh sieve, and pressing undersize materials to obtain the modified magnesium-smelting pellets;
and E2, loading the modified magnesium smelting pellets in the step E2 into a reduction tank, reducing for 8 hours under the conditions that the vacuum degree is 12.5Pa and the temperature is 1200 ℃, opening the reduction tank after the reduction is finished, taking out a crude magnesium ingot, and removing magnesium slag in the reduction tank to obtain blocky modified magnesium slag.
Example 6
The modified magnesium-smelting pellet of the embodiment comprises the following raw materials in percentage by weight: 78.4 percent of forged steel (the molar ratio of CaO/MgO is close to 1), 18 percent of ferrosilicon (the Si content is about 75 percent), 0.5 percent of fluorite (the content of CaF2 in fluorite is not less than 95 percent) and 3.1 percent of boric acid or borax.
The method for producing the modified magnesium slag by adopting the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
e1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely grinding the raw materials, then passing through a 100-mesh sieve, and pressing undersize materials to obtain the modified magnesium-smelting pellets;
and E2, loading the modified magnesium smelting pellets in the step E2 into a reduction tank, reducing for 10 hours under the conditions that the vacuum degree is 5Pa and the temperature is 1150 ℃, opening the reduction tank after the reduction is finished, taking out a crude magnesium ingot, and removing magnesium slag in the reduction tank to obtain blocky modified magnesium slag.
Example 7
The modified magnesium-smelting pellet of the embodiment comprises the following raw materials in percentage by weight: 81.55% of forged white (the molar ratio of CaO/MgO is close to 1), 15% of ferrosilicon (the Si content is about 75%), 1.75% of fluorite (the content of CaF2 in fluorite is not less than 95%) and 1.7% of boric acid or borax.
The method for producing the modified magnesium slag by adopting the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
e1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely grinding the raw materials, then passing through a 100-mesh sieve, and pressing undersize materials to obtain the modified magnesium-smelting pellets;
and E2, loading the modified magnesium smelting pellets in the E2 into a reduction tank, reducing for 6 hours under the conditions that the vacuum degree is 20Pa and the temperature is 1250 ℃, opening the reduction tank after the reduction is finished, taking out a crude magnesium ingot, and removing magnesium slag in the reduction tank to obtain blocky modified magnesium slag.
Example 8
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 90%, fly ash 10% and activator 0%; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
The modified magnesium slag generally has 5 percent or more of free MgO, and the free MgO in the modified magnesium slag is slowly hydrated and can be directly used as a cementing material for preparing magnesium-coal slag base without treatmentAfter forming a cemented filling body or a concrete member, Mg (OH) is formed with the slow hydration of MgO2The volume of the cemented filling body or the concrete member expands, so that the cemented filling body or the concrete member cracks and falls off, the strength of the cemented filling body or the concrete member is obviously reduced, and potential production safety hazards exist; the problems can be effectively avoided by performing natural aging or hot pouring treatment on the modified magnesium slag to form optimized magnesium slag and preparing the magnesium-cinder-based cementing material from the optimized magnesium slag.
In this embodiment, the activator is gypsum, and the gypsum is natural gypsum, phosphogypsum, fluorgypsum or industrial desulfurization gypsum.
Example 9
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 70% of optimized magnesium slag, 20% of fly ash and 10% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is anhydrous sodium sulphate (mirabilite).
Example 10
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 50%, fly ash 30% and activator 20%; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is calcium hydroxide.
Example 11
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 55% of optimized magnesium slag, 40% of fly ash and 5% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is lime.
Example 12
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 60% of optimized magnesium slag, 25% of fly ash and 15% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is soda.
Example 13
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 80% of optimized magnesium slag, 15% of fly ash and 5% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is baking soda.
Example 14
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 72.5 percent of optimized magnesium slag, 17.5 percent of fly ash and 10 percent of activator; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is triple superphosphate.
Example 15
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimizing 65% of magnesium slag, 20% of fly ash and 15% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is sodium silicate.
Example 16
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimizing 65% of magnesium slag, 30% of fly ash and 5% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is a polymeric salt.
Example 17
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 65% of optimized magnesium slag, 22.5% of fly ash and 12.5% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is a polymeric salt.
Example 18
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 65% of optimized magnesium slag, 22.5% of fly ash and 12.5% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is sodium chloride.
Example 19
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimizing 75% of magnesium slag, 25% of fly ash and 10% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is caustic soda.
In the above examples 8 to 19, the activator may be any combination of two or more of gypsum, anhydrous sodium sulphate (mirabilite), calcium hydroxide, lime, soda, baking soda, heavy calcium, sodium silicate, polymeric salt, sodium chloride and caustic soda.
In specific implementation, the proportion of each component for forming the magnesium-cinder-based cementing material can be adjusted according to cost, fluidity, strength, environment and the like.
In order to verify the performance of the magnesium-cinder-based cementitious materials in examples 8 to 19, standard samples were prepared according to the ingredients in the examples, and the formulation compositions are shown in table 2;
table 2 formulation table of magnesium-cinder-based cement in example 8 to example 19
Figure BDA0002995546990000161
Figure BDA0002995546990000171
Curing the magnesium-coal slag-based cementing material in a standard curing box for 28 days (the curing temperature is 20 ℃ and the humidity is 95%), and testing the compressive strength of the magnesium-coal slag-based cementing material according to a related method specified in the Cement mortar Strength test method GB/T17671-1999 to obtain a table 3;
TABLE 3 table of results of performance test of magnesium-clinker-based cement in examples 8 to 19
Figure BDA0002995546990000172
Example 20
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 5% of optimized magnesium slag, 80% of coal gasification slag and 15% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
The modified magnesium slag generally has 5 percent or more of free MgO, and because the free MgO in the modified magnesium slag is slowly hydrated and can be directly used as a magnesium-cinder-based cementing material if not processed, after a cemented filling body or a concrete member is constructed and formed, Mg (OH) is generated along with the slow hydration of the MgO2The volume of the cemented filling body or the concrete member expands, so that the cemented filling body or the concrete member cracks and falls off, the strength of the cemented filling body or the concrete member is obviously reduced, and potential production safety hazards exist; the problems can be effectively avoided by performing natural aging or hot pouring treatment on the modified magnesium slag to form optimized magnesium slag and preparing the magnesium-cinder-based cementing material from the optimized magnesium slag.
In this embodiment, the activator is gypsum.
Example 21
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 30% of optimized magnesium slag, 50% of gasified slag and 20% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is anhydrous sodium sulphate (mirabilite).
Example 22
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 17.5 percent of optimized magnesium slag, 65.5 percent of gasified slag and 7 percent of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is calcium hydroxide.
Example 23
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 20%, gasified slag 80% and activator 0%; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is lime.
Example 24
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 12.5%, gasified slag 67.5% and activator 10%; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is soda.
Example 25
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimizing 15% of magnesium slag, 70% of gasified slag and 15% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is baking soda.
Example 26
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 25% of optimized magnesium slag, 60% of coal gasification slag and 15% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is triple superphosphate.
Example 27
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 25% of optimized magnesium slag, 62.5% of coal gasification slag and 12.5% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is sodium silicate.
Example 28
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 20%, gasified slag 65.5% and activator 14.5%; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is a polymeric salt.
Example 29
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 25% of optimized magnesium slag, 70% of coal gasification slag and 5% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is sodium chloride.
Example 30
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimizing 22% of magnesium slag, 68% of coal gasification slag and 10% of activating agent; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is caustic soda.
In the above examples 23 to 33, the activator may be any combination of two or more of gypsum, anhydrous sodium sulphate (mirabilite), calcium hydroxide, lime, soda, baking soda, heavy calcium, sodium silicate, polymeric salt, sodium chloride and caustic soda.
In specific implementation, the proportion of each component for forming the magnesium-cinder-based cementing material can be adjusted according to cost, fluidity, strength, environment and the like.
In order to verify the properties of the magnesium-cinder-based cementitious materials of examples 23 to 33, standard samples were prepared according to the formulations of the examples, the formulation composition of which is shown in table 4;
table 4 formulation table of magnesium-cinder-based cement in examples 23 to 33
Figure BDA0002995546990000191
Figure BDA0002995546990000201
Curing the magnesium-coal slag-based cementing material in a standard curing box for 28 days (the curing temperature is 20 ℃ and the humidity is 95%), and testing the compressive strength of the magnesium-coal slag-based cementing material according to a related method specified in the Cement mortar Strength test method GB/T17671-1999 to obtain a table 5;
TABLE 5 table of results of performance test of magnesium-clinker-based cement in examples 23 to 33
Figure BDA0002995546990000202
Example 31
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 85% of waste residue mixture and 15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: 5% of optimized magnesium slag, 90% of gasified slag and 5% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
The modified magnesium slag generally has a residual of 5% or moreHigh free MgO, because of slow hydration of free MgO in the modified magnesium slag, if not processed, the modified magnesium slag can be directly used for preparing magnesium-cinder-based cementing materials, after a cemented filling body or a concrete member is constructed and formed, Mg (OH) is generated along with slow hydration of MgO2The volume of the cemented filling body or the concrete member expands, so that the cemented filling body or the concrete member cracks and falls off, the strength of the cemented filling body or the concrete member is obviously reduced, and potential production safety hazards exist; the problems can be effectively avoided by performing natural aging or hot pouring treatment on the modified magnesium slag to form optimized magnesium slag and preparing the magnesium-cinder-based cementing material from the optimized magnesium slag.
In this embodiment, the activator is gypsum, and the gypsum is natural gypsum, phosphogypsum, fluorgypsum or industrial desulfurization gypsum.
Example 32
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 100% of waste residue mixture and 0% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: 30% of optimized magnesium slag, 60% of gasified slag and 10% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is anhydrous sodium sulphate (mirabilite).
Example 33
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 92.5% of waste residue mixture and 7.5% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 17.5%, gasified slag 75.5% and fly ash 7%; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is calcium hydroxide.
Example 34
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 87% of waste residue mixture and 13% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimizing 7% of magnesium slag, 63% of gasified slag and 30% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is lime.
Example 35
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 88.5 percent of waste residue mixture and 11.5 percent of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 12.5%, gasified slag 70% and fly ash 17.5%; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is soda.
Example 36
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 90% of waste residue mixture and 10% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimizing 13% of magnesium slag, 65% of gasified slag and 22% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is baking soda.
Example 37
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 97% of waste residue mixture and 3% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimizing 22% of magnesium slag, 68% of gasified slag and 10% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is triple superphosphate.
Example 38
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 95% of waste residue mixture and 5% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimizing 16% of magnesium slag, 72.5% of gasified slag and 11.5% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this example, the activator is sodium silicate.
Example 39
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 91% of waste residue mixture and 9% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimizing 10% of magnesium slag, 80% of gasified slag and 10% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is a polymeric salt.
Example 40
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 88% of waste residue mixture and 12% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimizing 19% of magnesium slag, 65% of gasified slag and 16% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is sodium chloride.
EXAMPLE 41
The magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based novel cementing material comprises the following raw materials in percentage by weight: 88% of waste residue mixture and 12% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimizing 18% of magnesium slag, 67% of gasified slag and 15% of fly ash; the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is produced by using the modified magnesium smelting pellets in any one of the embodiments 1 to 7 to produce crude magnesium ingots, and the modified magnesium slag is produced by performing activity maintaining and stability maintaining treatment on magnesium slag produced by smelting magnesium by a Pidgeon process.
In this embodiment, the activator is caustic soda.
In the above examples 37 to 47, the activator may be any combination of two or more of gypsum, anhydrous sodium sulphate (mirabilite), calcium hydroxide, lime, soda, baking soda, heavy calcium, sodium silicate, polymeric salt, sodium chloride and caustic soda.
In specific implementation, the proportion of each component for forming the magnesium-cinder-based cementing material can be adjusted according to cost, fluidity, strength, environment and the like.
In order to verify the performance of the magnesium-cinder-based cementitious materials in examples 37 to 47, standard samples were prepared according to the ingredients in each example, and cured in a standard curing oven for 120 days (curing temperature of 20 ℃ and humidity of 95%), and the compressive strength of the magnesium-cinder-based cementitious materials was tested according to the relevant method specified in cement mortar strength test method GB/T17671-1999 to obtain table 7;
TABLE 7 table of results of performance test of magnesium-clinker-based cements in examples 37 to 47
Figure BDA0002995546990000231
Example 42
The magnesium-cinder-based novel paving and mining filling material comprises the following raw materials in percentage by weight: 15% of magnesium-cinder-based cementing material, 85% of aggregate and 0% of additive; the magnesium-cinder-based cementing material is any one of the embodiments 8 to 19; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
Example 43
The magnesium-cinder-based novel paving and mining filling material comprises the following raw materials in percentage by weight: 50% of magnesium-cinder-based cementing material, 50% of aggregate and 0% of additive; the magnesium-cinder-based cementing material is any one of the embodiments 8 to 19; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
Example 44
The magnesium-cinder-based novel paving and mining filling material comprises the following raw materials in percentage by weight: 37.5 percent of magnesium-cinder-based cementing material, 60 percent of aggregate and 2.5 percent of additive; the magnesium-cinder-based cementing material is any one of the embodiments 20-30; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
Example 45
The magnesium-cinder-based novel paving and mining filling material comprises the following raw materials in percentage by weight: 27.5 percent of magnesium-cinder-based cementing material, 67.5 percent of aggregate and 5 percent of additive; the magnesium-cinder-based cementing material is any one of the embodiments 20-30; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
Example 46
The magnesium-cinder-based novel paving and mining filling material comprises the following raw materials in percentage by weight: 32.5% of magnesium-cinder-based cementing material, 64% of aggregate and 3.5% of additive; the magnesium-cinder-based cementing material is any one of the embodiments 31-41; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
Example 47
The magnesium-cinder-based novel paving and mining filling material comprises the following raw materials in percentage by weight: 25% of magnesium-cinder-based cementing material, 70% of aggregate and 5% of additive; the magnesium-cinder-based cementing material is any one of the embodiments 31-41; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
Example 48
As shown in fig. 5, a method for preparing the magnesium-cinder-based novel paving and mining filling material in example 42 or 43 includes the following steps:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material; the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
in specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
in step 202, the specific process of mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance and grinding into the magnesium-coal slag-based novel paving and mining filling material comprises the following steps:
2021, weighing and optimizing the magnesium slag, the fly ash and the activator in proportion and mixing; the optimized magnesium slag, the fly ash and the activator comprise the following components in percentage by weight: optimizing 50-90% of magnesium slag, 10-40% of fly ash and 0-20% of activator (specifically, the formula of any one of the magnesium-coal slag-based cementing materials in the embodiments 8-19);
step 2022, pouring the mixture into a ball mill for grinding to obtain the magnesium-coal slag-based novel paving and mining filling material.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 49
A method of making the magnesium-cinder-based novel paving and mining fill material of either example 42 or example 43, comprising the steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material; the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
in specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
wherein, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance comprises the following steps:
step A1, selecting optimized magnesium slag, fly ash and an activating agent with different weight percentage contents within the optimized magnesium slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the fly ash and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step A2, inputting optimized magnesium slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal ratio to obtain the predicted strength of the magnesium-coal slag-based cementing material;
in specific implementation, the different days comprise 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, the optimized magnesium slag, the fly ash and the activator in different weight percentages are in the optimized formula range of the optimized magnesium slag, the fly ash and the activator, each step size is 0.01, and all the possible situations are changed circularly.
And A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the fly ash and the activator.
In step 202, the specific process of mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance and grinding the mixture into the magnesium-coal slag-based cementing material comprises the following steps:
2021, weighing and optimizing the magnesium slag, the fly ash and the activator in proportion and mixing;
step 2022, pouring the mixture into a ball mill for grinding to obtain the magnesium-cinder-based cementing material.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
The training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 4 nodes, the middle two layers comprise 5 nodes in each layer, and the output layer comprises 1 node; wherein 4 nodes of the input layer respectively comprise the content (50-90%) of optimized magnesium slag, the content (10-40%) of fly ash, the content (0-20%) of an activator and days (3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days); 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the fly ash and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
in specific implementation, the number of the sample data is 200-1000 groups;
step C3, normalizing the days in the sample data;
the number of days is mapped between 0 and 1, and in the specific implementation, the number of days is respectively 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, 3 days are mapped to be 0, and 120 days are mapped to be 1;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
The pseudo code is as follows:
Figure BDA0002995546990000251
the ratio corresponding to the maximum intensity value in the training network is
Figure BDA0002995546990000252
Derived in pseudo-code
Figure BDA0002995546990000253
Namely the optimal proportion.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 50
A method of making the magnesium-cinder-based novel paving and mining fill material of either example 42 or example 43, comprising the steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material; the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
in specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
wherein, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance comprises the following steps:
step B1, obtaining the predicted strength parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B11, selecting optimized magnesium slag, fly ash and activating agent with different weight percentage contents within the optimized magnesium slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the fly ash and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step B12, inputting optimized magnesium slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
in specific implementation, the different days comprise 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, the optimized magnesium slag, the fly ash and the activator in different weight percentages are in the optimized formula range of the optimized magnesium slag, the fly ash and the activator, each step size is 0.01, and all the possible situations are changed circularly.
Step B13, according to the formula
Figure BDA0002995546990000261
Normalizing the predicted strength of the magnesium-cinder-based novel paving and mining filling material obtained in the step B12 to obtain a normalized strength value y1nor(ii) a Wherein, y1For the predicted intensity of different days under the mixture ratio of the material, min y1For minimum prediction intensity, max y1Is the maximum predicted intensity;
step B2, obtaining economic index parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B21, respectively setting the unit prices of the optimized magnesium slag, the fly ash and the activator as a1、a2、a3Constructing an economic indicator function as y2＝a1x1+a2x2+a3x3(ii) a Wherein, y2Is an economic indicator, x1Is a coefficient related to the content of the optimized magnesium slag and x1∈(0.5,0.9)，x2Is a coefficient related to the content of fly ash and x2∈(0.1,0.4)，x3Is a coefficient related to the content of the activator and x3∈(0,0.2)；
Step B22, according to the economic index function y2＝a1x1+a2x2+a3x3And x1、x2And x3To solve the maximum value max y of the economic index2And minimum value min y of economic index2；
Step B23, according to the formula
Figure BDA0002995546990000262
Normalizing the economic index obtained in the step B22 to obtain a normalized economic index y2nor；
Step B3, according to the intensity value y after normalization processing1norAnd the normalized economic index y2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure BDA0002995546990000271
Determining the ratio corresponding to the maximum value of the objective function y as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the optimized fly ash and the optimized activator; wherein alpha is1Is a weight coefficient of intensity, alpha2Weight coefficient of economic nature, TH1Is the lowest up-to-standard intensity value of intensity, TH2Is the highest price threshold acceptable in economic indicators.
In step 202, the specific process of mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance and grinding the mixture into the magnesium-coal slag-based cementing material comprises the following steps:
2021, weighing and optimizing the magnesium slag, the fly ash and the activator in proportion and mixing;
step 2022, pouring the mixture into a ball mill for grinding to obtain the magnesium-cinder-based cementing material.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
The training process of selecting a Tensorflow network according to the optimal ratio is the same as that of the embodiment 49;
and step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 51
As shown in fig. 5, a method for preparing the magnesium-cinder-based cementitious material of example 44 or example 45 includes the steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in step 201 to obtain the optimized magnesium slag material specifically comprises the following steps:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: and (4) finely crushing the coarsely crushed optimized magnesium slag by using a double-roll crusher to obtain an optimized magnesium slag material.
In specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
in this embodiment, the pretreatment of screening, coarse crushing and fine crushing of the coal gasification slag in step 202 to obtain the coal gasification slag material specifically comprises the following steps:
step 2021, screening: screening the coal gasification coarse slag by using a vibrating screen to obtain a predetermined grain size meeting the requirement;
in this embodiment, the specific method for determining the particle size meeting the requirement in step 2021 includes:
20211, screening the coal gasification coarse slag by using a multistage vibrating screen into multiple stages; the coal gasification coarse slag is coal gasification slag raw slag generated after the coal chemical industry enterprise produces synthesis gas;
in the embodiment, a multistage vibrating screen is adopted to screen the coal gasification coarse slag according to the mesh number, the screen is 10 grades, and the 10 grades are respectively smaller than 8 meshes, 8 meshes to 10 meshes, 10 meshes to 14 meshes, 14 meshes to 18 meshes, 18 meshes to 24 meshes, 24 meshes to 35 meshes, 35 meshes to 50 meshes, 50 meshes to 120 meshes, 120 meshes to 200 meshes and larger than 200 meshes;
20212, measuring the quality and carbon content of the coal gasification coarse slag with different particle size ranges;
in this example, the coal gasification coarse slag with a particle size of less than 8 meshes calculated by the total amount of 1000g of the sample is m1(m1 is 253.1g), and the carbon content is w1(w1 is 0.37%); the coal gasification coarse slag with 8 meshes to 10 meshes has the mass of m2(m2 is 39.6g), and the carbon content is w2(w2 is 0.81%); the coal gasification coarse slag with 10 meshes to 14 meshes has the mass of m3(m3 is 82.5g), and the carbon content is w3(w3 is 2.18%); the coal gasification coarse slag with 14 meshes to 18 meshes is m4(m4 is 46.8g), the carbon content is w4(w4 is 6.25%), the coal gasification coarse slag with 18 meshes to 24 meshes is m5(m5 is 96.4g), and the carbon content is w5(w5 is 12.88%); the coal gasification coarse slag with 24 meshes to 35 meshes is m6(m6 is 147.4g), the carbon content is w6(w6 is 26.49%), the coal gasification coarse slag with 35 meshes to 50 meshes is m7(m7 is 164.2g), and the carbon content is w7(w7 is 24.48%); the coal gasification coarse slag with 50 meshes to 120 meshes has the mass of m8(m8 is 113.9g), the carbon content of w8(w8 is 34.46%), the coal gasification coarse slag with 120 meshes to 200 meshes has the mass of m9(m9 is 34.3g), and the carbon content of w9(w9 is 17.55%); the coal gasification coarse slag with the grain size of more than 200 meshes has the mass of m10(m10 is 21.8g), and the carbon content is w10(w10 is 20.68%); the results of measuring the mass and carbon content of the coal gasification coarse slag with different particle size ranges are shown in table 6;
TABLE 6 table of the results of measuring the quality and carbon content of the coal gasification coarse slag having different particle size ranges
Figure BDA0002995546990000281
Step 20213, using the mass as weight, according to the formula
Figure BDA0002995546990000282
Calculating the weighted carbon content omega of the coal gasification coarse slag, determining the particle size range of the coal gasification coarse slag meeting the requirement of the carbon content according to the 'loss on ignition of fly ash for cement or concrete is less than or equal to 8%' in national standard GB/T1596-2017 (fly ash for cement and concrete), and determining the particle size range as the particle size meeting the requirement; wherein j is the stage number corresponding to the maximum grain diameter meeting the requirement of carbon content, i is a natural number from 1 to j, and miIs the quality of i-th-stage coal gasification coarse slag, wiThe carbon content of the i-th-stage coal gasification coarse slag is shown.
In the embodiment, the grain size range of the coal gasification coarse slag meeting the carbon content requirement is determined to be that the mesh number is less than 24 meshes (-the carbon content of 24 meshes is 3.54%, and the carbon content of 35 meshes of coal gasification coarse slag is 8.63%).
The specific calculation process is as follows:
-carbon content of 24 mesh gasified slag:
Figure BDA0002995546990000283
-carbon content of 35 mesh gasified slag:
Figure BDA0002995546990000284
step 2022, coarse crushing: coarsely crushing the screened gasified slag by using a jaw crusher;
step 2023, fine crushing: and (4) finely crushing the screened gasified slag by using a double-roller crusher.
And 203, mixing the optimized magnesium slag, the gasified slag and the activator according to the content designed in advance, and grinding the mixture into the magnesium-coal slag-based cementing material.
In this embodiment, the specific process of mixing the optimized magnesium slag, the gasified slag and the activator according to the content designed in advance and grinding into the magnesium-cinder-based cementitious material in step 203 is as follows:
step 2031, weighing and optimizing the magnesium slag, the gasified slag and the activator in proportion and mixing; the optimized magnesium slag, the gasified slag and the activator comprise the following components in percentage by weight: optimizing 5-30% of magnesium slag, 50-80% of gasified slag and 0-20% of activating agent (specifically, the formula of any one of the magnesium-coal slag-based cementing materials in the embodiment 20-30);
and step 2032, pouring the mixture into a ball mill for grinding to obtain the magnesium-cinder-based cementing material.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 52
As shown in fig. 5, a method for preparing the magnesium-cinder-based cementitious material of example 44 or example 45 includes the steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in the step one to obtain the optimized magnesium slag material specifically comprises the following steps:
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in step 201 to obtain the optimized magnesium slag material specifically comprises the following steps:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: and (4) finely crushing the coarsely crushed optimized magnesium slag by using a double-roll crusher to obtain an optimized magnesium slag material.
In specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
in this embodiment, the specific process of screening, coarse crushing and fine crushing the coal gasification slag in step 202 to obtain the coal gasification slag charge is the same as that in embodiment 51.
And 203, mixing the optimized magnesium slag, the gasified slag and the activator according to the content designed in advance, and grinding the mixture into the magnesium-coal slag-based cementing material.
Wherein, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance comprises the following steps:
step A1, selecting optimized magnesium slag, gasified slag and activating agent with different weight percentage contents in the optimized magnesium slag, gasified slag and activating agent optimized formula range; the optimized magnesium slag, the gasified slag and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
step A2, inputting optimized magnesium slag, gasified slag and activating agent with different weight percentages into a Tensorflow network according to a pre-trained optimal proportion by combining different days to obtain the predicted strength of the magnesium-coal slag-based cementing material;
in specific implementation, the different days comprise 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, the optimized magnesium slag, the gasified slag and the activator with different weight percentage contents are in the optimized formula range of the optimized magnesium slag, the gasified slag and the activator, each step length is 0.01, and all possible situations are changed circularly.
And A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the gasified slag and the activator.
The training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 4 nodes, the middle two layers comprise 5 nodes in each layer, and the output layer comprises 1 node; wherein 4 nodes of the input layer respectively comprise the content of optimized magnesium slag (5-30%), the content of gasified slag (50-80%), the content of an activator (0-20%) and days (3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days); 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the gasified slag and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
in specific implementation, the number of the sample data is 200-1000 groups;
step C3, normalizing the days in the sample data;
the number of days is mapped between 0 and 1, and in the specific implementation, the number of days is respectively 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, 3 days are mapped to be 0, and 120 days are mapped to be 1;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
The pseudo code is as follows:
Figure BDA0002995546990000301
the ratio corresponding to the maximum intensity value in the training network is
Figure BDA0002995546990000302
Derived in pseudo-code
Figure BDA0002995546990000303
Namely the optimal proportion.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 53
As shown in fig. 5, a method for preparing the magnesium-cinder-based cementitious material of example 44 or example 45 includes the steps of:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in the step one to obtain the optimized magnesium slag material specifically comprises the following steps:
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in step 201 to obtain the optimized magnesium slag material specifically comprises the following steps:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: and (4) finely crushing the coarsely crushed optimized magnesium slag by using a double-roll crusher to obtain an optimized magnesium slag material.
In specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
in this embodiment, the specific process of screening, coarse crushing and fine crushing the coal gasification slag in step 202 to obtain the coal gasification slag charge is the same as that in embodiment 51.
And 203, mixing the optimized magnesium slag, the gasified slag and the activator according to the content designed in advance, and grinding the mixture into the magnesium-coal slag-based cementing material.
Wherein, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance comprises the following steps:
step B1, obtaining the predicted strength parameter of the magnesium-cinder-based cementing material, and the specific process comprises the following steps:
step B11, selecting optimized magnesium slag, gasified slag and activating agent with different weight percentage contents in the optimized magnesium slag, gasified slag and activating agent optimized formula range; the optimized magnesium slag, the gasified slag and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
step B12, inputting optimized magnesium slag, gasified slag and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based cementing material;
the training process of selecting the Tensorflow network according to the optimal mixture ratio is the same as that of the embodiment 52.
In specific implementation, the different days comprise 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, the optimized magnesium slag, the gasified slag and the activator with different weight percentage contents are in the optimized formula range of the optimized magnesium slag, the gasified slag and the activator, each step length is 0.01, and all possible situations are changed circularly.
Step B13, according to the formula
Figure BDA0002995546990000311
Normalizing the predicted strength of the magnesium-cinder-based cementing material obtained in the step B12 to obtain a normalized strength value y'1nor(ii) a Wherein, y'1Is the predicted intensity in min y 'for different days at the mix ratio of the material'1Is the minimum predicted intensity, max y'1Is the maximum predicted intensity;
and step B2, obtaining economic index parameters of the magnesium-cinder-based cementing material, and the concrete process is as follows:
step B21, respectively setting the unit prices of the optimized magnesium slag, the gasified slag and the activator as a'1、a′2、a′3Constructing an economic indicator function of y'2＝a′1x′1+a′2x′2+a′3x′3(ii) a Wherein, y'2Is an economic indicator of x'1Is a coefficient and x 'related to the content of the optimized magnesium slag'1∈(0.05,0.3)，x′2Is a coefficient related to the content of gasified slag and x'2∈(0.5,0.8)，x′3Is a coefficient related to the content of activator and x'3∈(0,0.2)；
Step B22, according to an economic indicator function y'2＝a′1x′1+a′2x′2+a′3x′3And x'1、x′2And x'3Obtaining the maximum value max y 'of the economic indicator'2And minimum value of economic indicator min y'2；
Step B23, according to the formula
Figure BDA0002995546990000312
Normalizing the economic indicator obtained in the step B22 to obtain a normalized economic indicator y'2nor；
Step B3, obtaining the normalized intensity value y'1norAnd the economic indicator y 'after normalization treatment'2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure BDA0002995546990000313
Determining the corresponding ratio when the value of the objective function y' is maximum as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the gasified slag and the activator; wherein, alpha'1Is a weight coefficient of intensity, alpha'2Is an economic weight coefficient, TH'1Is the lowest up-to-standard strength value of strength, TH'2Is the highest price threshold acceptable in economic indicators.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 54
As shown in fig. 5, a method for preparing the magnesium-cinder-based cementitious material of example 46 or example 47 includes the following steps:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in step 201 to obtain the optimized magnesium slag material specifically comprises the following steps:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: and (4) finely crushing the coarsely crushed optimized magnesium slag by using a double-roll crusher to obtain an optimized magnesium slag material.
In specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
in this embodiment, the pretreatment of screening, coarse crushing and fine crushing of the coal gasification slag in step 202 to obtain the coal gasification slag material specifically comprises the following steps:
step 2021, screening: screening the coal gasification coarse slag by using a vibrating screen to obtain a predetermined grain size meeting the requirement;
in this embodiment, the specific method for determining the particle size meeting the requirement in step 2021 includes:
20211, screening the coal gasification coarse slag by using a multistage vibrating screen into multiple stages; the coal gasification coarse slag is coal gasification slag raw slag generated after the coal chemical industry enterprise produces synthesis gas;
in the embodiment, a multistage vibrating screen is adopted to screen the coal gasification coarse slag according to the mesh number, the screen is 10 grades, and the 10 grades are respectively smaller than 8 meshes, 8 meshes to 10 meshes, 10 meshes to 14 meshes, 14 meshes to 18 meshes, 18 meshes to 24 meshes, 24 meshes to 35 meshes, 35 meshes to 50 meshes, 50 meshes to 120 meshes, 120 meshes to 200 meshes and larger than 200 meshes;
20212, measuring the quality and carbon content of the coal gasification coarse slag with different particle size ranges;
in this example, the coal gasification coarse slag with a particle size of less than 8 meshes calculated by the total amount of 1000g of the sample is m1(m1 is 253.1g), and the carbon content is w1(w1 is 0.37%); the coal gasification coarse slag with 8 meshes to 10 meshes has the mass of m2(m2 is 39.6g), and the carbon content is w2(w2 is 0.81%); the coal gasification coarse slag with 10 meshes to 14 meshes has the mass of m3(m3 is 82.5g), and the carbon content is w3(w3 is 2.18%); the coal gasification coarse slag with 14 meshes to 18 meshes is m4(m4 is 46.8g), the carbon content is w4(w4 is 6.25%), the coal gasification coarse slag with 18 meshes to 24 meshes is m5(m5 is 96.4g), and the carbon content is w5(w5 is 12.88%); the coal gasification coarse slag with 24 meshes to 35 meshes is m6(m6 is 147.4g), the carbon content is w6(w6 is 26.49%), the coal gasification coarse slag with 35 meshes to 50 meshes is m7(m7 is 164.2g), and the carbon content is w7(w7 is 24.48%); the coal gasification coarse slag with 50 meshes to 120 meshes has the mass of m8(m8 is 113.9g), the carbon content of w8(w8 is 34.46%), the coal gasification coarse slag with 120 meshes to 200 meshes has the mass of m9(m9 is 34.3g), and the carbon content of w9(w9 is 17.55%); the coal gasification coarse slag with the grain size of more than 200 meshes has the mass of m10(m10 is 21.8g), and the carbon content is w10(w10 is 20.68%); the results of measuring the mass and carbon content of the coal gasification coarse slag with different particle size ranges are shown in table 6;
TABLE 6 table of the results of measuring the quality and carbon content of the coal gasification coarse slag having different particle size ranges
Figure BDA0002995546990000321
Figure BDA0002995546990000331
Step 20213, using the mass as weight, according to the formula
Figure BDA0002995546990000332
Calculating the weighted carbon content omega of the coal gasification coarse slag, determining the particle size range of the coal gasification coarse slag meeting the requirement of the carbon content according to the 'loss on ignition of fly ash for cement or concrete is less than or equal to 8%' in national standard GB/T1596-2017 (fly ash for cement and concrete), and determining the particle size range as the particle size meeting the requirement; wherein j is the stage number corresponding to the maximum grain diameter meeting the requirement of carbon content, i is a natural number from 1 to j, and miIs the quality of i-th-stage coal gasification coarse slag, wiThe carbon content of the i-th-stage coal gasification coarse slag is shown.
In the embodiment, the grain size range of the coal gasification coarse slag meeting the carbon content requirement is determined to be that the mesh number is less than 24 meshes (-the carbon content of 24 meshes is 3.54%, and the carbon content of 35 meshes of coal gasification coarse slag is 8.63%).
The specific calculation process is as follows:
-carbon content of 24 mesh gasified slag:
Figure BDA0002995546990000333
-carbon content of 35 mesh gasified slag:
Figure BDA0002995546990000334
step 2022, coarse crushing: coarsely crushing the screened gasified slag by using a jaw crusher;
step 2023, fine crushing: and (4) finely crushing the screened gasified slag by using a double-roller crusher.
Step 203, mixing the optimized magnesium slag, the gasified slag and the fly ash according to the content designed in advance to form a waste slag mixture, adding an activating agent, and grinding the mixture into the magnesium-coal slag-based cementing material.
In this embodiment, the specific process of mixing the gasified slag, the optimized magnesium slag, and the fly ash, adding the activator, and grinding into the magnesium-coal slag-based novel cementing material in step 203 is as follows:
step 2031, weighing gasified slag, optimizing magnesium slag and fly ash according to a proportion, and mixing to form a waste slag mixture; the coal gasification coarse slag, the optimized magnesium slag and the fly ash comprise the following components in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
in specific implementation, the proportion can be adjusted according to cost, fluidity, strength and environment;
step 2032, weighing and mixing the waste residue mixture and the activating agent in proportion; the weight percentage content of the waste residue mixture and the activating agent is as follows: 85-100% of waste residue mixture and 0-15% of activating agent;
and 2033, pouring the mixture into a ball mill for grinding to obtain the magnesium-cinder-based cementing material.
In this embodiment, when the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 μm and the specific surface area is 300m2/kg～350m2Up to/kg.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 55
As shown in fig. 5, a method for preparing the magnesium-cinder-based cementitious material of example 46 or example 47 includes the following steps:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in step 201 to obtain the optimized magnesium slag material specifically comprises the following steps:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: and (4) finely crushing the coarsely crushed optimized magnesium slag by using a double-roll crusher to obtain an optimized magnesium slag material.
In specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
in this embodiment, the specific process of screening, coarse crushing and fine crushing the coal gasification slag in step 202 to obtain the coal gasification slag charge is the same as that in embodiment 54.
Step 203, mixing the optimized magnesium slag, the gasified slag and the fly ash according to the content designed in advance to form a waste slag mixture, adding an activating agent, and grinding the mixture into the magnesium-coal slag-based cementing material.
Wherein, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance comprises the following steps:
step A1, selecting optimized magnesium slag, gasified slag, fly ash and an activator with different weight percentage contents within the optimized magnesium slag, gasified slag, fly ash and activator optimized formula range; the optimized magnesium slag, the gasified slag, the fly ash and the activator are preferably prepared from the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step A2, inputting optimized magnesium slag, gasified slag, fly ash and activating agent with different weight percentages into a Tensorflow network according to a pre-trained optimal proportion by combining different days to obtain the predicted strength of the magnesium-coal slag-based cementing material;
in specific implementation, the different days comprise 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, the optimized magnesium slag, the gasified slag, the fly ash and the activator in different weight percentage contents are in the optimized formula range of the optimized magnesium slag, the gasified slag, the fly ash and the activator, each step length is 0.01, and all possible situations are changed circularly.
And A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the gasified slag, the fly ash and the activator.
In the embodiment, the concrete process of mixing the gasified slag, the optimized magnesium slag and the fly ash, adding the activator, and grinding into the magnesium-coal slag-based novel cementing material in the third step is as follows:
301, weighing gasified slag, optimized magnesium slag and fly ash according to a proportion, and mixing to form a waste slag mixture; the coal gasification coarse slag, the optimized magnesium slag and the fly ash comprise the following components in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
in specific implementation, the proportion can be adjusted according to cost, fluidity, strength and environment;
step 302, weighing and mixing the waste residue mixture and the activating agent according to a proportion; the weight percentage content of the waste residue mixture and the activating agent is as follows: 85-100% of waste residue mixture and 0-15% of activating agent;
step 303, pouring the mixture into a ball mill for grinding to obtain the magnesium-coal slag-based cementing material.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
The training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 5 nodes, the middle layer comprises two layers, each layer comprises 5 nodes, and the output layer comprises 1 node; wherein, the 5 nodes of the input layer are respectively the optimized magnesium slag content, the gasified slag content, the fly ash content, the activator content and the days (3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days); 1 node of the output layer is the prediction strength;
in specific implementation, the optimized magnesium slag, the gasified slag, the fly ash and the activator are contained in the following weight percentage: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step C2, obtaining the strength of the optimized magnesium slag, the gasified slag, the fly ash and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
in specific implementation, the number of the sample data is 200-1000 groups;
step C3, normalizing the days in the sample data;
the number of days is mapped between 0 and 1, and in the specific implementation, the number of days is respectively 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, 3 days are mapped to be 0, and 120 days are mapped to be 1;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 56
As shown in fig. 5, a method for preparing the magnesium-cinder-based cementitious material of example 46 or example 47 includes the following steps:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
in this embodiment, the pretreatment of coarse crushing and fine crushing on the optimized magnesium slag raw material in step 201 to obtain the optimized magnesium slag material specifically comprises the following steps:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: and (4) finely crushing the coarsely crushed optimized magnesium slag by using a double-roll crusher to obtain an optimized magnesium slag material.
In specific implementation, the selection of the crusher is not limited to the two types, and a suitable crusher is selected by considering factors such as the particle size of the raw material, the strength, the grindability index, the humidity, the viscosity and the like.
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
in this embodiment, the specific process of screening, coarse crushing and fine crushing the coal gasification slag in the second step to obtain the coal gasification slag charge is the same as that in embodiment 54.
Step 203, mixing the optimized magnesium slag, the gasified slag and the fly ash according to the content designed in advance to form a waste slag mixture, adding an activating agent, and grinding the mixture into the magnesium-coal slag-based cementing material.
Wherein, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance comprises the following steps:
step B1, obtaining the predicted strength parameter of the magnesium-cinder-based cementing material, and the specific process comprises the following steps:
step B11, selecting optimized magnesium slag, gasified slag, fly ash and an activating agent with different weight percentage contents within the optimized magnesium slag, gasified slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the gasified slag, the fly ash and the activator are preferably prepared from the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step B12, inputting optimized magnesium slag, gasified slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based cementing material;
the training process of selecting the Tensorflow network according to the optimal ratio is the same as that of the embodiment 21.
In specific implementation, the different days comprise 3 days, 7 days, 14 days, 28 days, 56 days, 90 days and 120 days, the optimized magnesium slag, the gasified slag, the fly ash and the activator in different weight percentage contents are in the optimized formula range of the optimized magnesium slag, the gasified slag, the fly ash and the activator, each step length is 0.01, and all possible situations are changed circularly.
Step B13, according to the formula
Figure BDA0002995546990000361
Normalizing the predicted strength of the magnesium-cinder-based cementing material obtained in the step B12 to obtain a normalized strength value y ″1nor(ii) a Wherein, y ″)1The predicted intensity of the material in different days, min y ″, is1For minimum predicted intensity, max "y1Is the maximum predicted intensity;
and step B2, obtaining economic index parameters of the magnesium-cinder-based cementing material, and the concrete process is as follows:
step B21, setting the unit prices of the optimized magnesium slag, the gasified slag, the fly ash and the activator as a ″, respectively1、a″2、a″3、a″4Constructing an economic indicator function as y ″)2＝a″1x″1+a″2x″2+a″3x″3+a″4x″4(ii) a Wherein, y ″)2Is an economic indicator, x ″)1Is a coefficient related to the content of the optimized magnesium slag and x ″)1∈(0.05,0.3)，x″2Is a coefficient related to the content of gasified slag and x'2∈(0.6,0.9)，x″3Is a coefficient related to the content of fly ash and x'3∈(0.05,0.3)，x″4Is a coefficient related to the content of activator and x'4∈(0,0.15)；
Step B22, according to the economic index function y ″)2＝a″1x″1+a″2x″2+a″3x″3+a″4x″4And x ″)1、x″2、x″3And x ″)4To solve the maximum value max y of the economic index2"and minimum value of economic index miny2″；
Step B23, according to the formula
Figure BDA0002995546990000362
Normalizing the economic indicator obtained in the step B22 to obtain a normalized economic indicator y ″2nor；
Step B3, according to the intensity value y' after normalization processing1norAnd the economic index y' after normalization processing2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure BDA0002995546990000363
Determining the ratio corresponding to the maximum value of the objective function y' as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the gasified slag, the fly ash and the activator; wherein, α ″)1Weight coefficient of intensity, alpha ″)2Is an economic weight coefficient, TH ″)1Is the lowest standard strength value of strength, TH2Is the highest price threshold acceptable in economic indicators.
When the mixture is poured into a ball mill for grinding, the mixture is ground until the particle size is less than 40 mu m and the specific surface area range is 300m2/kg～350m2Up to/kg.
And step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
Example 57
The magnesium-coal slag-based novel paving and mining filling material is applied to paving and mine filling.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (27)

1. The magnesium-cinder-based novel paving and mining filling material is characterized by comprising the following raw materials in percentage by weight: 15-50% of magnesium-cinder-based cementing material, 50-85% of aggregate and 0-5% of additive; the magnesium-cinder-based cementing material is a cementing material which is prepared by taking magnesium cinder as a basic raw material and adding one or two of fly ash and gasified cinder; the aggregate comprises one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum; the additive comprises one or more of a retarder, a water reducer, an early strength agent and a drag reducer.
2. The magnesium-cinder-based novel paving and mining filling material as claimed in claim 1, wherein: the magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by performing natural aging or hot pouring treatment on modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintaining and stability maintaining treatment on magnesium slag generated by smelting magnesium by a Pidgeon process, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%.
3. The preparation method of the magnesium-cinder-based novel paving and mining filling material as claimed in claim 2, characterized by comprising the following steps:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material; the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
202, mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
and step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
4. The preparation method of the magnesium-coal slag-based novel paving and mining filling material according to claim 3, characterized by comprising the following steps: in step 202, the specific process of mixing the optimized magnesium slag, the fly ash and the activator according to the content designed in advance and grinding into the magnesium-coal slag-based novel paving and mining filling material comprises the following steps:
2021, weighing and optimizing the magnesium slag, the fly ash and the activator in proportion and mixing; the optimized magnesium slag, the fly ash and the activator comprise the following components in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step 2022, pouring the mixture into a ball mill for grinding to obtain the magnesium-coal slag-based novel paving and mining filling material.
5. The preparation method of the magnesium-coal slag-based novel paving and mining filling material according to claim 3, characterized by comprising the following steps: before the step 202, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance is specifically as follows:
step A1, selecting optimized magnesium slag, fly ash and an activating agent with different weight percentage contents within the optimized magnesium slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the fly ash and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step A2, inputting optimized magnesium slag, fly ash and activating agent with different weight percentages into a Tensorflow network according to a pre-trained optimal proportion by combining different days to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
and A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the fly ash and the activator.
6. The preparation method of the magnesium-coal slag-based novel paving and mining filling material according to claim 3, characterized by comprising the following steps: before the step 202, the process of designing and optimizing the content of the magnesium slag, the fly ash and the activator in advance is specifically as follows:
step B1, obtaining the predicted strength parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B11, selecting optimized magnesium slag, fly ash and activating agent with different weight percentage contents within the optimized magnesium slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the fly ash and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 50-90%, fly ash 10-40% and activator 0-20%;
step B12, inputting optimized magnesium slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
step B13, according to the formula
Figure FDA0002995546980000031
Normalizing the predicted strength of the magnesium-cinder-based novel paving and mining filling material obtained in the step B12 to obtain a normalized strength value y1nor(ii) a Wherein, y1For the predicted intensity of different days under the mixture ratio of the material, miny1For minimum predicted intensity, maxy1Is the maximum predicted intensity;
step B2, obtaining economic index parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B21, respectively setting the unit prices of the optimized magnesium slag, the fly ash and the activator as a1、a2、a3Constructing an economic indicator function as y2＝a1x1+a2x2+a3x3(ii) a Wherein, y2Is an economic indicator, x1Is a coefficient related to the content of the optimized magnesium slag and x1∈(0.5,0.9)，x2Is a coefficient related to the content of fly ash and x2∈(0.1,0.4)，x3Is a coefficient related to the content of the activator and x3∈(0,0.2)；
Step B22, according to the economic index function y2＝a1x1+a2x2+a3x3And x1、x2And x3To solve the maximum value maxy of the economic index2And minimum value miny of economic index2；
Step B23, according to the formula
Figure FDA0002995546980000032
Normalizing the economic index obtained in the step B22 to obtain a normalized economic index y2nor；
Step B3, according to the intensity value y after normalization processing1norAnd the normalized economic index y2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure FDA0002995546980000033
Determining the ratio corresponding to the maximum value of the objective function y as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the optimized fly ash and the optimized activator; wherein alpha is1Is a weight coefficient of intensity, alpha2Weight coefficient of economic nature, TH1Is the lowest up-to-standard intensity value of intensity, TH2Is the highest price threshold acceptable in economic indicators.
7. The preparation method of the magnesium-cinder-based novel paving and mining filling material according to claim 5 or 6, characterized in that: the training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 4 nodes, the middle two layers comprise 5 nodes in each layer, and the output layer comprises 1 node; wherein, the 4 nodes of the input layer are respectively the optimized magnesium slag content, the fly ash content, the activator content and the days; 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the fly ash and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
step C3, normalizing the days in the sample data;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
8. The magnesium-coal slag-based novel paving and mining filling material is characterized in that magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by naturally aging or thermally pouring modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintenance and stability maintenance treatment on magnesium slag generated by Pidgeon magnesium smelting, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30 wt%, gasified slag 50-80 wt% and activator 0-20 wt%.
9. The preparation method of the magnesium-cinder-based novel paving and mining filling material as claimed in claim 8, characterized by comprising the following steps:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material; the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
step 203, mixing the optimized magnesium slag, the gasified slag and the activating agent according to the content designed in advance, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
and step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
10. The method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 9, characterized in that: in step 203, the specific process of mixing the optimized magnesium slag, the gasified slag and the activator according to the content designed in advance and grinding the mixture into the magnesium-coal slag-based novel paving and mining filling material comprises the following steps:
step 2031, weighing and optimizing the magnesium slag, the gasified slag and the activator in proportion and mixing; the optimized magnesium slag, the gasified slag and the activator comprise the following components in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
and 2032, pouring the mixture into a ball mill for grinding to obtain the novel magnesium-cinder-based paving and mining filling material.
11. The method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 9, characterized in that: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag and the activator in advance is specifically as follows:
step A1, selecting optimized magnesium slag, gasified slag and activating agent with different weight percentage contents in the optimized magnesium slag, gasified slag and activating agent optimized formula range; the optimized magnesium slag, the gasified slag and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
step A2, inputting optimized magnesium slag, gasified slag and activating agent with different weight percentages into a Tensorflow network according to pre-trained optimal proportion by combining different days to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
and A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the gasified slag and the activator.
12. The method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 9, characterized in that: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag and the activator in advance is specifically as follows:
step B1, obtaining the predicted strength parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B11, selecting optimized magnesium slag, gasified slag and activating agent with different weight percentage contents in the optimized magnesium slag, gasified slag and activating agent optimized formula range; the optimized magnesium slag, the gasified slag and the activating agent are preferably prepared from the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 50-80% and activator 0-20%;
step B12, inputting optimized magnesium slag, gasified slag and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
step B13, according to the formula
Figure FDA0002995546980000051
Normalizing the predicted strength of the magnesium-cinder-based novel paving and mining filling material obtained in the step B12 to obtain a normalized strength value y'1nor(ii) a Wherein, y'1Is the predicted intensity, miny ', for different days at the mix ratio of the material'1Is minimum predicted intensity, maxy'1Is the maximum predicted intensity;
step B2, obtaining economic index parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B21, respectively setting the unit prices of the optimized magnesium slag, the gasified slag and the activator as a'1、a′2、a′3Constructing an economic indicator function of y'2＝a′1x′1+a′2x′2+a′3x′3(ii) a Wherein, y'2Is an economic indicator of x'1Is a coefficient and x 'related to the content of the optimized magnesium slag'1∈(0.05,0.3)，x′2Is a coefficient related to the content of gasified slag and x'2∈(0.5,0.8)，x′3Is a coefficient related to the content of activator and x'3∈(0,0.2)；
Step B22, according to an economic indicator function y'2＝a′1x′1+a′2x′2+a′3x′3To do so byAnd x'1、x′2And x'3Calculating to obtain the maximum value of the economic indicator maxy'2And minimum value of economic indicator miny'2；
Step B23, according to the formula
Figure FDA0002995546980000061
Normalizing the economic indicator obtained in the step B22 to obtain a normalized economic indicator y'2nor；
Step B3, obtaining the normalized intensity value y'1norAnd the economic indicator y 'after normalization treatment'2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure FDA0002995546980000062
Determining the corresponding ratio when the value of the objective function y' is maximum as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the gasified slag and the activator; wherein, alpha'1Is a weight coefficient of intensity, alpha'2Is an economic weight coefficient, TH'1Is the lowest up-to-standard strength value of strength, TH'2Is the highest price threshold acceptable in economic indicators.
13. The method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 11 or 12, characterized in that: the training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 4 nodes, the middle two layers comprise 5 nodes in each layer, and the output layer comprises 1 node; wherein, the 4 nodes of the input layer respectively optimize the content of magnesium slag, the content of gasified slag, the content of an activating agent and the number of days; 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the gasified slag and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
step C3, normalizing the days in the sample data;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
14. The magnesium-coal slag-based novel paving and mining filling material is characterized in that magnesium slag is optimized magnesium slag, the optimized magnesium slag is magnesium slag obtained by naturally aging or thermally pouring modified magnesium slag, the modified magnesium slag is magnesium slag obtained by performing activity maintenance and stability maintenance treatment on magnesium slag generated by Pidgeon magnesium smelting, and the magnesium-coal slag-based cementing material comprises the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and flyash 5-30%.
15. A method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 14, wherein the method comprises the following steps:
step one, aggregate pretreatment: when the particle size of the aggregate is larger than 10mm, finely crushing the aggregate by a crusher until the particle size reaches below 10 mm;
step two, preparing the magnesium-cinder based cementing material, which comprises the following specific processes:
step 201, obtaining modified magnesium slag in a magnesium smelting plant, and placing the modified magnesium slag in a slag field for natural aging or hot pouring treatment to obtain an optimized magnesium slag raw material; carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain an optimized magnesium slag material;
the method comprises the following specific steps of carrying out coarse crushing and fine crushing pretreatment on the optimized magnesium slag raw material to obtain the optimized magnesium slag material:
step 2011, coarse crushing: coarsely crushing blocky optimized magnesium slag in the optimized magnesium slag raw material by using a jaw crusher;
step 2012, fine crushing: finely crushing the coarsely crushed optimized magnesium slag by using a double-roller crusher to obtain an optimized magnesium slag material;
202, carrying out screening, coarse crushing and fine crushing pretreatment on the coal gasification coarse slag to obtain a coal gasification slag charge;
step 203, mixing the optimized magnesium slag, the gasified slag and the fly ash according to the content designed in advance to form a waste slag mixture, adding an activating agent, and grinding the mixture into a magnesium-coal slag-based novel paving and mining filling material;
and step three, mixing the magnesium-cinder-based cementing material, the aggregate and the additive according to the content designed in advance to form a mixture, adding water and stirring to ensure that the mass concentration of the mixture is 75-85 percent, and preparing the magnesium-cinder-based novel paving and mining filling material.
16. The method for preparing the magnesium-cinder-based novel cementing material according to claim 15, characterized in that: the specific process of mixing the gasified slag, the optimized magnesium slag and the fly ash, adding the activator and grinding into the magnesium-coal slag-based novel cementing material in the step 203 is as follows:
step 2031, weighing gasified slag, optimizing magnesium slag and fly ash according to a proportion, and mixing to form a waste slag mixture; the coal gasification coarse slag, the optimized magnesium slag and the fly ash comprise the following components in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step 2032, weighing and mixing the waste residue mixture and the activating agent in proportion; the weight percentage content of the waste residue mixture and the activating agent is as follows: 85-100% of waste residue mixture and 0-15% of activating agent;
and 2033, pouring the mixture into a ball mill for grinding to obtain the novel magnesium-coal slag-based paving and mining filling material.
17. The method for preparing the magnesium-cinder-based novel cementing material according to claim 15, characterized in that: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag, the fly ash and the activator in advance is specifically as follows:
step A1, selecting optimized magnesium slag, gasified slag, fly ash and an activator with different weight percentage contents within the optimized magnesium slag, gasified slag, fly ash and activator optimized formula range; the optimized magnesium slag, the gasified slag, the fly ash and the activator are preferably prepared from the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step A2, inputting optimized magnesium slag, gasified slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
and A3, selecting the mixture ratio corresponding to the highest strength for 28 days as the optimal mixture ratio, and determining the optimal mixture ratio as the content of the optimized magnesium slag, the gasified slag, the fly ash and the activator.
18. The method for preparing the magnesium-cinder-based novel cementing material according to claim 15, characterized in that: before the step 203, the process of designing and optimizing the content of the magnesium slag, the gasified slag, the fly ash and the activator in advance is specifically as follows:
step B1, obtaining the predicted strength parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B11, selecting optimized magnesium slag, gasified slag, fly ash and an activating agent with different weight percentage contents within the optimized magnesium slag, gasified slag, fly ash and activating agent optimized formula range; the optimized magnesium slag, the gasified slag, the fly ash and the activator are preferably prepared from the following raw materials in percentage by weight: 85-100% of waste residue mixture and 0-15% of activating agent; the waste residue mixture comprises the following raw materials in percentage by weight: optimized magnesium slag 5-30%, gasified slag 60-90% and fly ash 5-30%;
step B12, inputting optimized magnesium slag, gasified slag, fly ash and activating agent with different weight percentages in combination with different days into a Tensorflow network selected according to a pre-trained optimal proportion to obtain the predicted strength of the magnesium-coal slag-based novel paving and mining filling material;
step B13, according to the formula
Figure FDA0002995546980000091
Normalizing the predicted strength of the magnesium-cinder-based novel paving and mining filling material obtained in the step B12 to obtain a normalized strength value y ″1nor(ii) a Wherein, y ″)1For the predicted strength of different days under the mixture ratio of the material, miny1For minimum predicted intensity, maxy1Is the maximum predicted intensity;
step B2, obtaining economic index parameters of the magnesium-cinder-based novel paving and mining filling material, and the concrete process is as follows:
step B21, setting the unit prices of the optimized magnesium slag, the gasified slag, the fly ash and the activator as a ″, respectively1、a″2、a″3、a″4Constructing an economic indicator function as y ″)2＝a″1x″1+a″2x″2+a″3x″3+a″4x″4(ii) a Wherein, y ″)2Is an economic indicator, x ″)1Is a coefficient related to the content of the optimized magnesium slag and x ″)1∈(0.05,0.3)，x″2Is a coefficient related to the content of gasified slag and x'2∈(0.6,0.9)，x″3Is a coefficient related to the content of fly ash and x'3∈(0.05,0.3)，x″4Is a coefficient related to the content of activator and x'4∈(0,0.15)；
Step B22, according to the economic index function y ″)2＝a″1x″1+a″2x″2+a″3x″3+a″4x″4And x ″)1、x″2、x″3And x ″)4To solve the maximum value of the economic index maxy ″)2And the minimum value miny "of the economic indicator2；
Step B23, according to the formula
Figure FDA0002995546980000092
Normalizing the economic indicator obtained in the step B22 to obtain a normalized economic indicator y ″2nor；
Step B3, according to the intensity value y' after normalization processing1norAnd the economic index y' after normalization processing2norConstructing an objective function for determining an optimal ratio based on intensity and economy as
Figure FDA0002995546980000093
Determining the ratio corresponding to the maximum value of the objective function y' as the optimal ratio, and determining the optimal ratio as the content of the optimized magnesium slag, the gasified slag, the fly ash and the activator; wherein, α ″)1Weight coefficient of intensity, alpha ″)2Is an economic weight coefficient, TH ″)1Is the lowest standard strength value of strength, TH2Is the highest price threshold acceptable in economic indicators.
19. The method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 17 or 18, wherein the method comprises the following steps: the training process of selecting the Tensorflow network according to the optimal proportion is as follows:
step C1, establishing a four-layer Tensorflow network, wherein the input layer comprises 5 nodes, the middle layer comprises two layers, each layer comprises 5 nodes, and the output layer comprises 1 node; wherein, the 5 nodes of the input layer respectively optimize the content of magnesium slag, the content of gasified slag, the content of fly ash, the content of an activator and the number of days; 1 node of the output layer is the prediction strength;
step C2, obtaining the strength of the optimized magnesium slag, the gasified slag, the fly ash and the activator with different weight percentage contents obtained by a plurality of groups of experiments under different days as sample data;
step C3, normalizing the days in the sample data;
and step C4, training the Tensorflow network established in the step C1 by adopting the sample data after normalization processing, and iterating for multiple times to obtain the trained optimal mixture ratio selection Tensorflow network.
20. The magnesium-cinder-based novel paving and mining filling material according to any one of claims 2, 8 and 14, wherein: the method for performing activity retention and stability retention treatment on magnesium slag generated by Pidgeon magnesium smelting adopts a method for refining crude magnesium ingots by using modified magnesium smelting pellets to generate modified magnesium slag, wherein the modified magnesium smelting pellets comprise the following raw materials in percentage by weight: 81 to 82.8 percent of calcined dolomite, 15 to 16.6 percent of ferrosilicon, 1.25 to 2.71 percent of fluorite and 0.23 to 0.29 percent of ferroboron; the ferroboron alloy comprises the following elements in percentage by weight: 16 to 20.5 percent of B, 0.5 to 1.0 percent of C, 1.5 to 2.5 percent of Si, 0.05 to 0.5 percent of Al and the balance of Fe.
21. The magnesium-cinder-based novel paving and mining filling material of claim 20, wherein: the method for producing the modified magnesium slag by using the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
d1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely grinding the raw materials, then passing through a 100-mesh sieve, and pressing undersize materials to obtain the modified magnesium-smelting pellets;
and D2, loading the modified magnesium smelting pellets in the step D1 into a reduction tank, reducing for 7-8 h under the conditions that the vacuum degree is 5-10 Pa and the temperature is 1200-1220 ℃, opening the reduction tank after the reduction is finished, taking out a crude magnesium ingot, and removing magnesium slag in the reduction tank to obtain blocky modified magnesium slag.
22. The magnesium-cinder-based novel paving and mining filling material according to any one of claims 2, 8 and 14, wherein: the method for performing activity retention and stability retention treatment on magnesium slag generated by Pidgeon magnesium smelting adopts a method for refining crude magnesium ingots by using modified magnesium smelting pellets to generate modified magnesium slag, wherein the modified magnesium smelting pellets comprise the following raw materials in percentage by weight: 12 to 18 percent of ferrosilicon, 0.5 to 3 percent of fluorite, 0.3 to 3.1 percent of boric acid or borax, and the balance of calcined dolomite.
23. The magnesium-cinder-based novel paving and mining fill material of claim 22, wherein: the method for producing the modified magnesium slag by using the modified magnesium smelting pellets to smelt the crude magnesium ingot comprises the following steps:
e1, according to the weight percentage of each raw material in the modified magnesium-smelting pellets, sending the raw materials into a mill, uniformly mixing and finely grinding the raw materials, then passing through a 100-mesh sieve, and pressing undersize materials to obtain the modified magnesium-smelting pellets;
and E2, loading the modified magnesium smelting pellets in the step E2 into a reduction tank, reducing for 6-10 h under the conditions that the vacuum degree is 5-20 Pa and the temperature is 1150-1250 ℃, opening the reduction tank after the reduction is finished, taking out a crude magnesium ingot, and removing magnesium slag in the reduction tank to obtain blocky modified magnesium slag.
24. The magnesium-cinder-based novel paving and mining filling material according to any one of claims 2, 8 and 14, wherein: the activating agent is one or more of gypsum, anhydrous sodium sulphate, calcium hydroxide, lime, soda, baking soda, heavy calcium, sodium silicate, polymeric salt, sodium chloride and caustic soda; the gypsum is natural gypsum, phosphogypsum, fluorgypsum or industrial desulfurization gypsum.
25. The method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 9 or 15, characterized in that: in step 202, the pretreatment of screening, coarse crushing and fine crushing of the coal gasification slag to obtain the coal gasification slag comprises the following specific processes:
step 2021, screening: screening the coal gasification coarse slag by using a vibrating screen to obtain a predetermined grain size meeting the requirement;
step 2022, coarse crushing: coarsely crushing the screened gasified slag by using a jaw crusher;
step 2023, fine crushing: and (4) finely crushing the screened gasified slag by using a double-roller crusher.
26. The method for preparing the magnesium-cinder-based novel paving and mining filling material according to claim 25, wherein the method comprises the following steps: the specific method for predetermining the particle size meeting the requirement in step 2021 is:
20211, screening the coal gasification coarse slag by using a multistage vibrating screen into multiple stages; the coal gasification coarse slag is coal gasification slag raw slag generated after the coal chemical industry enterprise produces synthesis gas;
20212, measuring the quality and carbon content of the coal gasification coarse slag with different particle size ranges;
step 20213, using the mass as weight, according to the formula
Figure FDA0002995546980000111
Calculating the weighted carbon content omega of the coal gasification coarse slag, determining the particle size range of the coal gasification coarse slag meeting the carbon content requirement according to the national standard GB/T1596-2017 that the ignition loss of the fly ash used for cement or concrete is less than or equal to 8 percent, and determining the particle size range as the particle size meeting the requirement; wherein j is the stage number corresponding to the maximum grain diameter meeting the requirement of carbon content, i is a natural number from 1 to j, and miIs the quality of i-th-stage coal gasification coarse slag, wiThe carbon content of the i-th-stage coal gasification coarse slag is shown.
27. Use of the magnesium-cinder-based novel paving and mine filling material according to any one of claims 1, 2, 8 and 14 in paving and mine filling.
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CN114477932A (en) * 2022-02-18 2022-05-13 北京科技大学 Road engineering product made of cement-free low-carbon cementing material
CN114591055A (en) * 2022-02-18 2022-06-07 涉县清漳水泥制造有限公司 Steel slag aggregate low-carbon road concrete doped with coal-to-oil residue and preparation method thereof
CN114988750A (en) * 2022-05-30 2022-09-02 浙江振鑫新材料科技有限公司 Retarded cement mixture and preparation method thereof
CN115073114A (en) * 2022-06-15 2022-09-20 舒新前 Cement-free cementing material with large magnesium slag mixing amount and preparation method and application thereof
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Publication number Priority date Publication date Assignee Title
CN113831036A (en) * 2021-09-17 2021-12-24 西安科技大学 High-free calcium oxide solid waste base gelling material and preparation and application thereof
CN114477932A (en) * 2022-02-18 2022-05-13 北京科技大学 Road engineering product made of cement-free low-carbon cementing material
CN114591055A (en) * 2022-02-18 2022-06-07 涉县清漳水泥制造有限公司 Steel slag aggregate low-carbon road concrete doped with coal-to-oil residue and preparation method thereof
CN114988750A (en) * 2022-05-30 2022-09-02 浙江振鑫新材料科技有限公司 Retarded cement mixture and preparation method thereof
CN115073114A (en) * 2022-06-15 2022-09-20 舒新前 Cement-free cementing material with large magnesium slag mixing amount and preparation method and application thereof
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