CN112897971A - Self-flowing cemented filling material containing superfine tail mud and preparation method and application thereof - Google Patents
Self-flowing cemented filling material containing superfine tail mud and preparation method and application thereof Download PDFInfo
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- CN112897971A CN112897971A CN202110050510.XA CN202110050510A CN112897971A CN 112897971 A CN112897971 A CN 112897971A CN 202110050510 A CN202110050510 A CN 202110050510A CN 112897971 A CN112897971 A CN 112897971A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a self-flowing cementing filling material containing superfine tail mud, a preparation method and application thereof, wherein the cementing filling material comprises a cementing material, aggregate and water as raw materials; the cementing material comprises the following components in parts by weight: 40-80 parts of converter steel slag, 5-30 parts of desulfurized gypsum and 0-20 parts of desulfurized ash; the aggregate comprises superfine tail mud; the mass ratio of the cementing material to the aggregate is 1: 4-6; the concentration of the slurry is 55-70%. The filling material effectively utilizes a large amount of superfine tailing mud, does not mix cement clinker and slag powder, can show good compression strength capable of being industrially applied without adding additives such as an exciting agent, an early strength agent and the like, and can be used for mining filling materials.
Description
Technical Field
The invention relates to the field of mine filling materials, in particular to a self-flowing cemented filling material containing superfine tailing mud, and a preparation method and application thereof.
Background
A large amount of tailings produced in the mining production are piled on the ground, so that potential safety hazards and ecological environment problems are easily caused. The filling mining technology backfills tailings and other wastes into the goaf, plays an increasingly important role in improving the resource recovery rate, protecting the environment and guaranteeing the safety of mining, and the filling mining method is increasingly widely applied.
However, as the grade of mined ore is reduced, the grinding granularity of the ore is gradually reduced to ensure the mineral separation index, so that the fraction of tailings produced by a separation plant is increasingly finer, which brings new changes and requirements for concentration, preparation, transportation and strength formation of a filling body related to a filling system. Moreover, the mineral components in the superfine tailing sand and the tailing mud are complex, the utilization value is low, the utilization difficulty is high, the requirement of environmental protection and the like indicates that the occupation of a refuse dump is increasingly difficult for mine enterprises, and the number of tailings ponds used is reduced year by year. How to reasonably utilize the superfine tailing sand and the tailing mud is a difficult problem of waste recovery.
In addition, on one hand, with the continuous rising of the cement price, the proportion of the filling cost of enterprises to the mining cost is continuously increased; on the other hand, in recent years, the utilization rates of converter steel slag, desulfurized gypsum and desulfurized fly ash are low. Therefore, how to reasonably utilize the superfine tail mud and find a filling cementing material suitable for replacing cement so as to reduce the mining cost of a filling method and greatly reduce the filling cost and the environmental protection pressure is a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a self-flowing cementing filling material containing superfine tail mud, a preparation method and application thereof, wherein the filling material effectively utilizes a large amount of superfine tail mud, does not mix cement clinker and slag powder, can show good compression strength capable of being industrially applied without adding additives such as an excitant, an early strength agent and the like, is used for mining filling materials, fully utilizes the tail mud, reasonably solves the problem of solid waste stockpiling of the superfine tail mud, steel slag, desulfurization byproducts and the like, and greatly reduces the industrial application cost.
To this end, in a first aspect, the invention provides a self-flowing cemented filling material containing superfine tail mud, wherein the raw materials of the cemented filling material comprise a cementing material, an aggregate and water;
the cementing material comprises the following components in parts by weight: 40-80 parts of converter steel slag, 5-30 parts of desulfurized gypsum and 0-20 parts of desulfurized ash;
the aggregate comprises superfine tail mud;
the mass ratio of the cementing material to the aggregate is 1: 4-6;
the slurry concentration of the cemented filling material is 55-70%.
The superfine tailing is tailing with the particle size of less than 200 mu m; in particular to the tailings of the products of the ore dressing plant in the mining industry production, which is not limited by the source or the type and has the grain diameter of less than 200 mu m.
The desulfurization ash refers to desulfurization ash obtained by semi-dry sintering, and is semi-hydrated gypsum.
The main component of the desulfurized gypsum of the invention is similar to natural gypsum and is calcium sulfate dihydrate CaSO4·2H2O。
The invention also optimizes the proportion and the chemical composition of each component on the basis of the formula so as to improve the gelling property to a greater extent or reduce the industrial cost.
Further, the aggregate is only composed of superfine tail mud, the cementing material is composed of three components of converter steel slag, desulfurized ash and desulfurized gypsum, and the proportion is as described in the invention, and each component can take any value within the range described in the invention. For example, the desulfurized fly ash can be taken at 0 part, 5 parts, 10 parts, 15 parts, 20 parts, etc.; the desulfurized gypsum can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts and the like; the converter steel slag can be 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts and the like.
In a specific embodiment, the cementing material comprises the following components in parts by weight: 40-80 parts of converter steel slag, 5-30 parts of desulfurized gypsum and 5-20 parts of desulfurized ash.
In another embodiment, the cementitious material comprises the following ingredients in parts by weight: 40-80 parts of converter steel slag and 5-30 parts of desulfurized gypsum.
Further, the superfine tail mud comprises the following components in parts by weight: SiO 2230-35 parts of MgO 9-14 parts of Fe2O312-17 parts of CaO, 8-15 parts of Al2O35-10 parts of, P2O51-4 parts.
Further, the converter steel slag comprises the following components in parts by weight: 50-55 parts of CaO, SiO21-2 parts of Al2O335-40 parts of MgO 4-6 parts of SO31-2 parts.
Further, the desulfurized fly ash comprises the following components in parts by weight: 52-57 parts of CaO, SiO20 to 1 part of Al2O30-1 part of MgO, 0-1 part of SO313-18 parts of Fe2O30-1 part.
Further, the desulfurized gypsum is packaged according to the parts by weightComprises the following steps: 42-47 parts of CaO, SiO24-6 parts of Al2O31-2 parts of MgO, 1-2 parts of SO340-45 parts of Cl and 0-1 part of Cl.
The chemical composition of the superfine tail mud, the converter steel slag, the desulfurized ash and the desulfurized gypsum in the invention refers to the content of various metal or mineral elements in oxide, and does not refer to the content of compounds in the superfine tail mud, the steel slag, the desulfurized ash or the desulfurized gypsum in oxide. In addition, the above chemical composition results can be obtained by conventional detection methods known in the art, such as typical fluorescence detection after or without loss of ignition. The steel slag, the desulfurized ash, the desulfurized gypsum and the superfine tail mud used in the invention can be purchased from the market or prepared by self as long as the requirements of chemical compositions are met.
Further, the specific surface area of the desulfurized gypsum is 300m2More than kg;
further, the specific surface area of the converter steel slag is 400m2More than kg.
Further, the specific surface area of the desulfurized fly ash is 650m2More than kg.
The specific surface area of the raw materials is improved through grinding, so that the hydration difficulty is reduced on one hand, and the uniformity of the materials is improved on the other hand.
Furthermore, the grain diameter of the superfine tail mud is 2-200 μm, and the content of the superfine tail mud smaller than 20 μm accounts for more than 48 wt%. In a preferred embodiment, the D10 is 2.43 μm, the D50 is 16.9 μm, and the D90 is 121 μm in the ultra-fine tail mud.
In a second aspect of the present invention, there is provided a method for preparing the cementitious filler according to the present invention, comprising: and weighing the cementing material, the aggregate and water, and uniformly mixing.
At present, the treatment modes of the superfine tail mud in China are mainly divided into two types: earth surface stockpiling and goaf backfilling. According to the sedimentation characteristic of the superfine tail mud, the factors of safe maintenance of a tailing pond, comprehensive utilization of later tailings and the like are considered, and the conventional tailing pond is not suitable for piling in the superfine tail mud treatment. The invention utilizes industrial wastes such as converter steel slag, flue gas desulfurization gypsum, steel mill desulfurization ash and the like to replace common Portland cement adhesives, realizes the synergistic effect of the industrial wastes, and treats wastes with processes of wastes against one another.
Compared with the prior art, the technical scheme of the invention has the following progress:
(1) compared with the existing paste filling material, the invention has small aggregate particle size and high slurry concentration, fully improves the recovery utilization rate of the superfine tail mud, reasonably solves the problem of stacking the superfine tail mud, and ensures that the superfine tail mud is recycled to the maximum extent.
(2) Compared with the existing cement clinker or the cementing material containing steel slag and slag, the cementing material disclosed by the invention is simpler in composition, does not need to add an exciting agent, an early strength agent and other additives, consists of three components of converter steel slag, desulfurized ash and desulfurized gypsum, and does not add cement clinker and slag, so that the raw material cost is greatly reduced, the risk of metal leaching is avoided, and the safety is high.
(3) The cementing filler provided by the invention has simplified composition, and can still show good cementing performance and rheological property, including compressive strength and fluidity, due to the synergistic effect. According to GB17671-1999 cement mortar strength test method, the filling material provided by the invention is cured and tested after being prepared into a paste test block, and shows good compressive strength.
(4) The invention provides a better mixing amount of the superfine tail mud serving as the aggregate in a solid waste base cementing system, improves the strength, can solve the problems of reduction, harmlessness and recycling of industrial solid waste (superfine tail mud and steel and iron slag), promotes the synergistic utilization of the solid waste and the hazardous waste and environmental protection, provides the filling material by combining a cementing, filling and mining technology to solve the problems of low roof-contacting rate of a stope and tailing stockpiling, and lays the foundation of engineering application.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below. It should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The main chemical components (each element is calculated by oxide) of the raw material ultra-fine tail mud, converter steel slag, desulfurized fly ash and desulfurized gypsum used in the following examples are analyzed and shown in table 1, and the detection method comprises the following steps: x-ray fluorescence Spectroscopy (XRF), and substance composition analysis was performed by measuring secondary X-rays using an X-ray fluorescence spectrometer model XRF-1800.
TABLE 1 analysis of the main chemical composition of the raw materials
Example 1
The embodiment provides a cemented filling material, and the preparation method comprises the following steps:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 75 percent of converter steel slag and 25 percent of desulfurized gypsum, and grinding the desulfurized gypsum to the specific surface area of 350m2Per kg, the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 4;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 65%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Example 2
The embodiment provides a cemented filling material, and the preparation method comprises the following steps:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 70 percent of converter steel slag and 30 percent of desulfurized gypsum, and grinding the desulfurized gypsum to the specific surface area of 350m2Per kg, the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 6;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 65%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Example 3
The embodiment provides a cemented filling material, and the preparation method comprises the following steps:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 75 percent of converter steel slag, 20 percent of desulfurized gypsum and 5 percent of desulfurized ash, and the desulfurized gypsum is ground to the specific surface area of 350m2Per kg, the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 4;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 65%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Example 4
The embodiment provides a cemented filling material, and the preparation method comprises the following steps:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 65% of converter steel slag, 25% of desulfurized gypsum and 10% of desulfurized ash, and the desulfurized gypsum is ground to the specific surface area of 350m2Per kg, the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 6;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 60%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Example 5
The embodiment provides a cemented filling material, and the preparation method comprises the following steps:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 60% of converter steel slag, 20% of desulfurized gypsum and 20% of desulfurized ash, and the desulfurized gypsum is ground to the specific surface area of 350m2Per kg, the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 4;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 55%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Example 6
The embodiment provides a cemented filling material, and the preparation method comprises the following steps:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 50% of converter steel slag, 30% of desulfurized gypsum and 20% of desulfurized ash, and the desulfurized gypsum is ground to the specific surface area of 350m2Per kg, the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 6;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 65%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Comparative example 1
The comparative example provides a cementitious filler, the method of preparation comprising the steps of:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 75 percent of converter steel slag and 25 percent of desulfurized ash, and the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 4;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 65%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Comparative example 2
The comparative example provides a cementitious filler, the method of preparation comprising the steps of:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 75 percent of converter steel slag and 25 percent of desulfurized ash, and the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 6;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 65%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Comparative example 3
The comparative example provides a cementitious filler, the method of preparation comprising the steps of:
(1) weighing the raw materials of the cementing material according to the following mass percentage: 90 percent of converter steel slag, 5 percent of desulfurized gypsum and 5 percent of desulfurized ash, and the desulfurized gypsum is ground to the specific surface area of 350m2Per kg, the converter steel slag is ground to 400m of specific surface area2/kg；
(2) Weighing superfine tail mud according to the mass ratio of the cementing material to the superfine tail mud of 1: 4;
(3) mixing the raw materials weighed in the steps (1) and (2), adding water according to the slurry concentration of 65%, and uniformly stirring;
(4) and (3) curing to different ages after pouring and forming to test the compressive strength: the filler sample is prepared according to GB17671-1999 cement mortar strength test method, the sample size is 40mm multiplied by 160mm, and the maintenance and compression strength test is carried out at the temperature of 20 ℃ and the humidity of more than 99.5 percent.
Examples of the experiments
The test results of examples 1 to 6 and comparative examples 1 to 3 are shown in Table 2.
TABLE 2
The test results shown in table 2 show that the gravity-flow cemented filling material containing the superfine tail mud provided by the invention has good compressive strength, particularly the compressive strength is more than 1Mpa after 28 days of maintenance, the requirement of industrial application is met, the difficult problem of piling up solid wastes such as the superfine tail mud, steel slag, desulfurization byproducts and the like is solved, and the industrial application cost is greatly reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The self-flowing cemented filling material containing the superfine tail mud comprises raw materials of a cementing material, an aggregate and water;
the cementing material comprises the following components in parts by weight: 40-80 parts of converter steel slag, 5-30 parts of desulfurized gypsum and 0-20 parts of desulfurized ash;
the aggregate comprises superfine tail mud;
the mass ratio of the cementing material to the aggregate is 1: 4-6;
the slurry concentration of the cemented filling material is 55-70%.
2. The cementitious filler of claim 1, wherein the ultra-fine tailings comprise, in parts by weight: SiO 2230-35 parts of MgO 9-14 parts of Fe2O312-17 parts of CaO, 8-15 parts of Al2O35-10 parts of, P2O51-4 parts.
3. The cementitious filler material of claim 1, wherein the converter steel slag comprises, in parts by weight: 50-55 parts of CaO, SiO21-2 parts of Al2O335-40 parts of MgO 4-6 parts of SO31-2 parts.
4. The cementitious filler of claim 1, wherein the desulfurized ash comprises, in parts by weight: 52-57 parts of CaO, SiO20 to 1 part of Al2O30-1 part of MgO, 0-1 part of SO313-18 parts of Fe2O30-1 part.
5. The cementitious filler of claim 1, wherein the desulfurized gypsum comprises, in parts by weight: 42-47 parts of CaO, SiO24-6 parts of Al2O31-2 parts of MgO, 1-2 parts of SO340-45 parts of Cl and 0-1 part of Cl.
6. The cementitious filler according to claim 1, wherein the particle size of the ultra-fine tailings is 2 to 200 μm, and the content of less than 20 μm is 48 wt% or more;
preferably, the D10 in the superfine tail mud is 2.43 μm, the D50 is 16.9 μm, and the D90 is 121 μm.
7. The cementitious filler of claim 1, wherein the desulfurized gypsum has a specific surface area of 300m2More than kg.
8. The cementitious filler material of claim 1, wherein the converter steel slag has a specific surface area of 400m2More than kg.
9. The cementitious filler of claim 1, wherein the desulfurized ash has a specific surface area of 650m2More than kg; preferably, the desulfurized fly ash is prepared by semi-dry sintering.
10. A method of producing a cementitious filler according to any one of claims 1 to 9, characterised in that it comprises: and weighing the cementing material, the aggregate and water, and uniformly mixing.
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| CN202110050510.XA Pending CN112897971A (en) | 2021-01-14 | 2021-01-14 | Self-flowing cemented filling material containing superfine tail mud and preparation method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113264748A (en) * | 2021-06-09 | 2021-08-17 | 迁安威盛固废环保实业有限公司 | Mine paste filling material and preparation method and application thereof |
| CN113816710A (en) * | 2021-09-07 | 2021-12-21 | 中国恩菲工程技术有限公司 | Self-flowing type cementing filling material of molybdenum-containing tailings and preparation method thereof |
| CN113831033A (en) * | 2021-07-30 | 2021-12-24 | 辽宁壹立方砂业有限责任公司 | Desulfurized fly ash-steel slag composite gelled composition and desulfurized fly ash-steel slag composite gelled material |
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| CN110655376A (en) * | 2019-10-30 | 2020-01-07 | 北京科技大学 | Steel slag synergistic preparation full-solid waste cementing material and multi-objective optimization method |
| CN111312344A (en) * | 2020-02-12 | 2020-06-19 | 河北钢铁集团矿业有限公司 | Optimization method of full-solid waste cementing material and mixed aggregate filling slurry |
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| CN103787601A (en) * | 2013-12-27 | 2014-05-14 | 金川集团股份有限公司 | Iron ore full-tailing filling gel material prepared by using sintering desulfuration ash instead of gypsum |
| CN105198247A (en) * | 2015-09-16 | 2015-12-30 | 鞍钢集团矿业公司 | Method for preparing full-tailing cementing material with sintering and desulfurization ash |
| CN110655376A (en) * | 2019-10-30 | 2020-01-07 | 北京科技大学 | Steel slag synergistic preparation full-solid waste cementing material and multi-objective optimization method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113264748A (en) * | 2021-06-09 | 2021-08-17 | 迁安威盛固废环保实业有限公司 | Mine paste filling material and preparation method and application thereof |
| CN113831033A (en) * | 2021-07-30 | 2021-12-24 | 辽宁壹立方砂业有限责任公司 | Desulfurized fly ash-steel slag composite gelled composition and desulfurized fly ash-steel slag composite gelled material |
| CN113816710A (en) * | 2021-09-07 | 2021-12-21 | 中国恩菲工程技术有限公司 | Self-flowing type cementing filling material of molybdenum-containing tailings and preparation method thereof |
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