CN113772984A - Green high-performance slag micro powder - Google Patents
Green high-performance slag micro powder Download PDFInfo
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- CN113772984A CN113772984A CN202111273389.3A CN202111273389A CN113772984A CN 113772984 A CN113772984 A CN 113772984A CN 202111273389 A CN202111273389 A CN 202111273389A CN 113772984 A CN113772984 A CN 113772984A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- 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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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses green high-performance slag micro powder, which relates to the field of raw materials for buildings and comprises slag, silicon powder, lithium slag and activated crystal seeds. According to the invention, no chemical reagent or chemical method is adopted, the specific surface area of the product can be greatly improved only by adjusting the steps and parameters of the grinding attack and adding a specific formula, so that the activity of the product is improved, and the green high-performance slag micro powder with wide application range and good performance is obtained.
Description
Technical Field
The invention relates to the field of raw materials for buildings, in particular to green high-performance slag micro powder.
Background
The granulated blast furnace slag is waste slag produced during smelting pig iron in blast furnace and is mainly divided into three products, namely water quenching slag, air cooling slag and granulated slag. The blast furnace slag has similar chemical composition to cement clinker, but has a slightly lower calcium oxide content. Grinding the slag powder to a certain fineness to obtain slag micro powder. The slag micropowder can be used as the raw material of concreteThe modifier can be used for replacing cement with higher cost and can also be used as a modifier to improve the performance of concrete. After 2000 years, with the intensive research on energy-saving technology of grinding equipment and economic technology of slag micro powder application, cement enterprises recognize that the most economic grinding fineness of the slag micro powder is controlled to be 400m2About/kg. Under the push of the rapid development of the recycling economy, the yield of the slag micro powder doubles year by year, exceeds 1000 ten thousand tons/year in 2007, and is also increasing at a rapid rate in recent years. The slag is independently ground to a specific surface area of more than 400m2/kg, and the mixing proportion of the slag powder used as a cement admixture can be improved by more than 70 percent without reducing the cement strength. The micro powder can be used as a concrete admixture to equivalently replace 20-50% of cement, can be prepared into high-performance concrete, and has the effects of saving energy, reducing consumption, reducing cost, protecting environment and improving the utilization added value of slag. The national slag micro powder is divided into three grades of S105, S95 and S75, the higher the grade is, the higher the specific surface area is, the better the activity is. At present, the slag powder is mainly applied to mixed materials for producing cement and admixture for producing concrete. However, the current situation of the application of fine-ground blast furnace slag powder in various countries in the world is different due to different conditions in the aspects of production technology, industrial development, standard preparation and the like. Slag powder in some countries is mainly used for cement production, such as japan and brazil; most of some countries are used for concrete admixtures, such as the united states; some countries and regions have both, such as china and the european union. However, in the prior art, the activity of the slag micro powder is improved by adding chemical agents and utilizing chemical reaction, and the methods generally have the problems of serious environmental pollution, high cost, low product stability and the like. The existing mechanical method for preparing the high-activity slag micro powder is limited by equipment. Granulated blast furnace slag is difficult to be finely ground due to high hardness. The specific surface area of the slag micro powder is controlled to be 400-440m by adopting a vertical mill according to the national standard of the general S95 level2The range of/kg. The specific surface area of the slag micro powder of the horizontal ball mill can only be controlled to 350-370m2In terms of/kg. The slag micro powder has the defects that the activity index is generally lower than 65 percent in three days and the early strength is obviously lower, so that the potential activity of the slag micro powder can not be fully exerted, and the service performance is greatly influencedAnd (4) limitation.
Disclosure of Invention
In order to solve the problems, the invention provides a new green high-performance slag micro powder prepared by improving the activity of the slag micro powder by adjusting the steps and parameters of a grinding process by a physical method, and the scheme is as follows:
the invention provides green high-performance slag micro powder which comprises slag, silicon powder, lithium slag and activated crystal seeds.
Preferably, the green high-performance slag micro powder comprises the following components in parts by weight: 80-90 parts of slag, 3-5 parts of silicon powder, 2-4 parts of lithium slag and 0.5-1.5 parts of activated seed crystal.
Preferably, the green high-performance slag micro powder comprises the following components in parts by weight: 90 parts of slag, 5 parts of silicon powder, 4 parts of lithium slag and 1 part of activated seed crystal.
The slag is granulated blast furnace slag with the granularity of 200-300 meshes; the granularity of the silicon powder is 200-500 meshes; the granularity of the lithium slag is 200-300 meshes.
Preferably, the preparation method of the green high-performance slag micro powder comprises the following steps:
s1, respectively feeding the raw material slag, the silicon powder, the lithium slag and the activated seed crystal into a roller press for rolling;
s2, separating the powder discharged from the roller press by a V-shaped powder separator, separating the obtained fine powder by a rotor powder separator, and separating the obtained coarse powder by magnetic separation and iron removal and then feeding the coarse powder into the roller press;
s3, putting fine powder obtained by powder selection of the rotor powder selector into a ball mill, and returning the obtained coarse powder into a roller press for rolling;
and S4, controlling the raw material proportion and the ball milling parameters in the ball mill to perform ball milling, continuously controlling the raw material proportion and the parameters to perform sand milling after ball milling, and discharging and milling to obtain the green high-performance slag micro powder.
Preferably, S4 controls the specific surface area of the green high-performance slag micro powder of the finally ground material after ball milling to be 700m2More than kg, and 15 μm of D97.
Preferably, the ball milling process of S4 adopts a vertical mill.
Preferably, the ball milling in S4 is to perform a first ball milling on the slag and the activated seed fine powder obtained in S3, add the obtained material into the silicon powder and the lithium slag fine powder obtained in S3, and perform a second sand milling.
Preferably, the grinding balls are yttria-stabilized zirconia ceramics, the mass ratio of the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm is (1-4): 2-6): 1; and S1, performing ball milling, wherein the ratio of the mass of the milling balls to the total mass of the slag and the activated seed crystal fine powder is (10-30): 1.
The primary ball milling is carried out, the revolution rotating speed of the ball milling speed is 100 plus 400rpm, the rotation rotating speed is 200 plus 800rpm, and the ball milling time is 1-10 h.
Preferably, the secondary sanding and the grinding balls are made of yttria-stabilized zirconia ceramic materials, the diameters of the yttria-stabilized zirconia ceramic materials comprise two or three of 3mm, 1mm and 0.5mm, and the mass ratio of the grinding balls with the diameters of 3mm, 1mm and 0.5mm is (0-2): (0.5-3): 1; the secondary sanding is carried out, wherein the ratio of the mass of the grinding balls to the total mass of the materials is (3-8): 1; the secondary sanding is carried out at the speed of 500-.
Preferably, the rolling is performed at S1, and the pressure is 100-150 MPa.
Preferably, the S2 powder selection is carried out by adopting an 80 μm sieve.
Preferably, the activated seed crystal is steel slag micropowder.
Further, the steel slag micro powder is prepared by the method disclosed in Chinese patent CN 108203252B.
Advantageous effects
The invention has the beneficial effects that:
according to the invention, no chemical reagent or chemical method is adopted, the specific surface area of the product can be greatly improved only by adjusting the steps and parameters of the grinding attack and adding a specific formula, so that the activity of the product is improved, and the green high-performance slag micro powder with wide application range and good performance is obtained.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The following examples and comparative examples are parallel runs, with the same processing steps and parameters, unless otherwise indicated.
Preparation example: preparation of activated seed:
putting 1500kg of steel slag into an iron remover, adding 20kg of water, 100kg of gypsum and 3.4kg of lanthanum hybrid activator into the iron-removed steel slag, metering, grinding the steel slag into powder in a ball mill, and separating qualified micro powder through powder separation equipment after the grinding is finished for subpackage to obtain the iron-removing steel slag.
The grinding speed of the steel slag is 50kg/min, and the specific surface area of the ground micro powder is 550m2/kg。
And hot air at 300 ℃ is introduced into an air inlet of the powder selecting equipment to accelerate the drying of the materials and the partial dehydration of the hydrated steel slag.
The lanthanum hybrid activator is prepared according to the following technical scheme:
according to the mass fraction, 30 parts of triethanolamine, 0.03 part of 5-methoxymethyl-1, 3, 4-thiadiazole-2-thiol, 0.05 part of tris [ N, N-bis (trimethylsilane) amine ] lanthanum, 5 parts of 4, 5-pyridazinedicarboxylic acid, 10 parts of isopropanol and 12 parts of glycerol are put into a reaction kettle, the temperature is controlled at 55 ℃, 20 parts of sodium fluosilicate, 10 parts of copper sulfate and 1.5 parts of graphene slurry are added after stirring reaction for 4 hours, 10 parts of water is added into the reaction kettle after reaction for 6 hours at 1MPa and 165 ℃, and the lanthanum hybridization activator is obtained after uniform stirring.
Example 1 a green high-performance slag micropowder:
the green high-performance slag micro powder comprises slag, silicon powder, lithium slag and activated seed crystal.
The green high-performance slag micro powder comprises the following components in parts by weight: 80 parts of slag, 3 parts of silicon powder, 2 parts of lithium slag and 0.5 part of activated seed crystal.
The slag is granulated blast furnace slag with the granularity of 200-300 meshes; the granularity of the silicon powder is 200-500 meshes; the granularity of the lithium slag is 200-300 meshes.
The preparation method of the green high-performance slag micro powder comprises the following steps:
s1, respectively feeding the raw material slag, the silicon powder, the lithium slag and the activated seed crystal into a roller press for rolling;
s2, separating the powder discharged from the roller press by a V-shaped powder separator, separating the obtained fine powder by a rotor powder separator, and separating the obtained coarse powder by magnetic separation and iron removal and then feeding the coarse powder into the roller press;
s3, putting fine powder obtained by powder selection of the rotor powder selector into a ball mill, and returning the obtained coarse powder into a roller press for rolling;
and S4, controlling the raw material proportion and the ball milling parameters in the ball mill to perform ball milling, continuously controlling the raw material proportion and the parameters to perform sand milling after ball milling, and discharging and milling to obtain the green high-performance slag micro powder.
S4, controlling the specific surface area of the green high-performance slag micro powder of the finally ground material after ball milling to be 700m2More than kg, and 15 μm of D97.
And S4, ball milling by using a vertical mill.
And S4, performing ball milling on the slag and the activated seed crystal fine powder obtained in the step S3, adding the silicon powder and the lithium slag fine powder obtained in the step S3 into the obtained material, and performing secondary sand milling.
Performing primary ball milling, wherein the grinding balls are yttria-stabilized zirconia ceramics, the diameters of the grinding balls comprise 25mm, 15mm, 10mm and 5mm, and the mass ratio of the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm is 1:1:2: 1; and S1, performing ball milling, wherein the ratio of the mass of the milling balls to the total mass of the slag and the activated seed crystal fine powder is 10: 1.
And performing primary ball milling, wherein the ball milling speed is 100rpm in revolution, 200rpm in rotation, and the ball milling time is 5 h.
The grinding balls are made of yttria-stabilized zirconia ceramic materials, the diameters of the grinding balls comprise two or three of 3mm, 1mm and 0.5mm, and the mass ratio of the grinding balls with the diameters of 3mm, 1mm and 0.5mm is 1:0.5: 1; the secondary sanding is carried out, and the ratio of the mass of the grinding balls to the total mass of the materials is 3: 1; the secondary sanding is carried out, the speed of a main machine is 500rpm, and the sanding time is 5 hours.
S1, rolling at the pressure of 100-150 MPa.
S2, selecting the powder by using an 80-micron sieve.
Example 2 a green high performance slag micropowder:
the green high-performance slag micro powder comprises slag, silicon powder, lithium slag and activated seed crystal.
The green high-performance slag micro powder comprises the following components in parts by weight: 90 parts of slag, 5 parts of silicon powder, 4 parts of lithium slag and 1 part of activated seed crystal.
The slag is granulated blast furnace slag with the granularity of 200-300 meshes; the granularity of the silicon powder is 200-500 meshes; the granularity of the lithium slag is 200-300 meshes.
The preparation method of the green high-performance slag micro powder comprises the following steps:
s1, respectively feeding the raw material slag, the silicon powder, the lithium slag and the activated seed crystal into a roller press for rolling;
s2, separating the powder discharged from the roller press by a V-shaped powder separator, separating the obtained fine powder by a rotor powder separator, and separating the obtained coarse powder by magnetic separation and iron removal and then feeding the coarse powder into the roller press;
s3, putting fine powder obtained by powder selection of the rotor powder selector into a ball mill, and returning the obtained coarse powder into a roller press for rolling;
and S4, controlling the raw material proportion and the ball milling parameters in the ball mill to perform ball milling, continuously controlling the raw material proportion and the parameters to perform sand milling after ball milling, and discharging and milling to obtain the green high-performance slag micro powder.
S4, controlling the specific surface area of the green high-performance slag micro powder of the finally ground material after ball milling to be 700m2More than kg, and 15 μm of D97.
And S4, ball milling by using a vertical mill.
And S4, performing ball milling on the slag and the activated seed crystal fine powder obtained in the step S3, adding the silicon powder and the lithium slag fine powder obtained in the step S3 into the obtained material, and performing secondary sand milling.
Performing primary ball milling, wherein the grinding balls are yttria-stabilized zirconia ceramics, the diameters of the grinding balls comprise 25mm, 15mm, 10mm and 5mm, and the mass ratio of the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm is 1:1:2: 1; and S1, performing ball milling, wherein the ratio of the mass of the milling balls to the total mass of the slag and the activated seed crystal fine powder is 10: 1.
And performing primary ball milling, wherein the ball milling speed is 100rpm in revolution, 200rpm in rotation, and the ball milling time is 5 h.
The grinding balls are made of yttria-stabilized zirconia ceramic materials, the diameters of the grinding balls comprise two or three of 3mm, 1mm and 0.5mm, and the mass ratio of the grinding balls with the diameters of 3mm, 1mm and 0.5mm is 1:0.5: 1; the secondary sanding is carried out, and the ratio of the mass of the grinding balls to the total mass of the materials is 3: 1; the secondary sanding is carried out, the speed of a main machine is 500rpm, and the sanding time is 5 hours.
S1, rolling at the pressure of 100-150 MPa.
S2, selecting the powder by using an 80-micron sieve.
Example 3 a green high performance slag micropowder:
the green high-performance slag micro powder comprises slag, silicon powder, lithium slag and activated seed crystal.
The green high-performance slag micro powder comprises the following components in parts by weight: 90 parts of slag, 5 parts of silicon powder, 4 parts of lithium slag and 1 part of activated seed crystal.
The slag is granulated blast furnace slag with the granularity of 200-300 meshes; the granularity of the silicon powder is 200-500 meshes; the granularity of the lithium slag is 200-300 meshes.
The preparation method of the green high-performance slag micro powder comprises the following steps:
s1, respectively feeding the raw material slag, the silicon powder, the lithium slag and the activated seed crystal into a roller press for rolling;
s2, separating the powder discharged from the roller press by a V-shaped powder separator, separating the obtained fine powder by a rotor powder separator, and separating the obtained coarse powder by magnetic separation and iron removal and then feeding the coarse powder into the roller press;
s3, putting fine powder obtained by powder selection of the rotor powder selector into a ball mill, and returning the obtained coarse powder into a roller press for rolling;
and S4, controlling the raw material proportion and the ball milling parameters in the ball mill to perform ball milling, continuously controlling the raw material proportion and the parameters to perform sand milling after ball milling, and discharging and milling to obtain the green high-performance slag micro powder.
S4, controlling the specific surface area of the green high-performance slag micro powder of the finally ground material after ball milling to be 700m2More than kg, and 15 μm of D97.
And S4, ball milling by using a vertical mill.
And S4, performing ball milling on the slag and the activated seed crystal fine powder obtained in the step S3, adding the silicon powder and the lithium slag fine powder obtained in the step S3 into the obtained material, and performing secondary sand milling.
Performing primary ball milling, wherein the grinding balls are yttria-stabilized zirconia ceramics, the diameters of the grinding balls comprise 25mm, 15mm, 10mm and 5mm, and the mass ratio of the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm is 4:4:6: 1; and S1, performing ball milling, wherein the ratio of the mass of the milling balls to the total mass of the slag and the activated seed crystal fine powder is 30: 1.
And performing primary ball milling, wherein the ball milling speed is 400rpm in revolution, 800rpm in rotation and 10h in ball milling time.
The grinding balls are made of yttria-stabilized zirconia ceramic materials, the diameters of the grinding balls comprise two or three of 3mm, 1mm and 0.5mm, and the mass ratio of the grinding balls with the diameters of 3mm, 1mm and 0.5mm is 2:3: 1; the secondary sanding is carried out, wherein the ratio of the mass of the grinding balls to the total mass of the materials is 8: 1; the secondary sanding is carried out, the main machine speed is 1600rpm, and the sanding time is 10 hours.
S1, rolling at the pressure of 100-150 MPa.
S2, selecting the powder by using an 80-micron sieve.
Inspecting a sample after finishing primary ball milling in S4, wherein the specific surface area of the obtained material is 480m2More than kg.
Comparative example 1 a fine slag powder:
the green high-performance slag micro powder comprises slag, silicon powder, lithium slag and activated seed crystal.
The green high-performance slag micro powder comprises the following components in parts by weight: 90 parts of slag, 5 parts of silicon powder, 4 parts of lithium slag and 1 part of activated seed crystal.
The slag is granulated blast furnace slag with the granularity of 200-300 meshes; the granularity of the silicon powder is 200-500 meshes; the granularity of the lithium slag is 200-300 meshes.
The preparation method of the green high-performance slag micro powder comprises the following steps:
s1, respectively feeding the raw material slag, the silicon powder, the lithium slag and the activated seed crystal into a roller press for rolling;
s2, separating the powder discharged from the roller press by a V-shaped powder separator, separating the obtained fine powder by a rotor powder separator, and separating the obtained coarse powder by magnetic separation and iron removal and then feeding the coarse powder into the roller press;
s3, putting fine powder obtained by powder selection of the rotor powder selector into a ball mill, and returning the obtained coarse powder into a roller press for rolling;
and S4, controlling the raw material proportion and the ball milling parameters in the ball mill to perform ball milling, and obtaining the green high-performance slag micro powder after milling.
And S4, ball milling by using a vertical mill.
In the ball milling described in S4, all the fine powders obtained in S3 were first subjected to one ball milling.
Performing primary ball milling, wherein the grinding balls are yttria-stabilized zirconia ceramics, the diameters of the grinding balls comprise 25mm, 15mm, 10mm and 5mm, and the mass ratio of the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm is 4:4:6: 1; and S1, performing ball milling, wherein the ratio of the mass of the milling balls to the total mass of the fine powder materials is 30: 1.
And performing primary ball milling, wherein the ball milling speed is 400rpm in revolution, 800rpm in rotation and 20h in ball milling time.
S1, rolling at the pressure of 100-150 MPa.
S2, selecting the powder by using an 80-micron sieve.
S4 specific surface area of the green high-performance slag micro powder of the finally ground material is 500m2About/kg.
Comparative example 2 a fine slag powder:
the green high-performance slag micro powder comprises slag, silicon powder, lithium slag and activated seed crystal.
The green high-performance slag micro powder comprises the following components in parts by weight: 90 parts of slag, 5 parts of silicon powder, 4 parts of lithium slag and 1 part of activated seed crystal.
The slag is granulated blast furnace slag with the granularity of 200-300 meshes; the granularity of the silicon powder is 200-500 meshes; the granularity of the lithium slag is 200-300 meshes.
The preparation method of the green high-performance slag micro powder comprises the following steps:
s1, respectively feeding the raw material slag, the silicon powder, the lithium slag and the activated seed crystal into a roller press for rolling;
s2, separating the powder discharged from the roller press by a V-shaped powder separator, separating the obtained fine powder by a rotor powder separator, and separating the obtained coarse powder by magnetic separation and iron removal and then feeding the coarse powder into the roller press;
s3, putting fine powder obtained by powder selection of the rotor powder selector into a ball mill, and returning the obtained coarse powder into a roller press for rolling;
and S4, controlling the raw material proportion and the ball milling parameters in the ball mill to perform ball milling, continuously controlling the raw material proportion and the parameters to perform sand milling after ball milling, and discharging and milling to obtain the green high-performance slag micro powder.
S4, controlling the specific surface area of the green high-performance slag micro powder of the finally ground material after ball milling to be 700m2More than kg, and 15 μm of D97.
And S4, ball milling by using a vertical mill.
And S4, performing ball milling on all the fine powder obtained in the step S3 for the first time, and adding the obtained material for secondary sand milling.
Performing primary ball milling, wherein the grinding balls are yttria-stabilized zirconia ceramics, the diameters of the grinding balls comprise 25mm, 15mm, 10mm and 5mm, and the mass ratio of the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm is 4:4:6: 1; and S1, performing ball milling, wherein the ratio of the mass of the milling balls to the total mass of the fine powder materials is 30: 1.
And performing primary ball milling, wherein the ball milling speed is 400rpm in revolution, 800rpm in rotation and 10h in ball milling time.
The grinding balls are made of yttria-stabilized zirconia ceramic materials, the diameters of the grinding balls comprise two or three of 3mm, 1mm and 0.5mm, and the mass ratio of the grinding balls with the diameters of 3mm, 1mm and 0.5mm is 2:3: 1; the secondary sanding is carried out, and the ratio of the mass of the grinding balls to the total mass of the fine powder materials is 8: 1; the secondary sanding is carried out, the main machine speed is 1600rpm, and the sanding time is 10 hours.
S1, rolling at the pressure of 100-150 MPa.
S2, selecting the powder by using an 80-micron sieve.
After the primary ball milling in S4, inspecting the sample, wherein the specific surface area of the obtained material is 400m2About/kg, the specific surface area of the finally obtained product is 500m2About/kg.
The products obtained in the above examples and comparative examples are applied to the green high-performance slag micro powder and the slag micro powder activity index obtained by detecting three types of commercially available cement, and the results are as follows:
application scenarios
The green high-performance slag micropowder prepared in example 1-3 was applied to the following scenes with the following effects:
1. the method is used for cement production: 15% -20% of green high-performance slag micro powder is added in the cement production process, the strength is increased by 2-3 MPa in three days, and the strength is increased by 3-6 MPa in twenty-eight days, so that the use performance of the cement can be improved after the slag micro powder is doped, the production cost of the cement is reduced, the emission of atmospheric pollutants is reduced, and the slag micro powder is beneficial to energy conservation and environmental protection in the cement production process.
2. After the concrete is added according to a certain proportion in the production of the concrete, the sulfate resistance and the seawater corrosion resistance of the concrete are improved, the compactness of the concrete is improved, the carbonization resistance is enhanced, and meanwhile, the strength and the construction performance of the concrete can be improved.
3. The high-activity admixture is added in a certain proportion when tubular pile concrete is prepared, the strength of the concrete can be obviously improved, the effect of autoclave curing of the conventionally prepared tubular pile concrete under 10 atmospheric pressures can be achieved only by steam curing for 6-8 hours, the equipment investment of tubular pile production can be reduced, the occupied area is reduced, the potential safety hazard of autoclave curing and high-pressure curing is reduced or eliminated, the tubular pile yield is greatly improved, and the production cost is reduced.
While the preferred embodiments and examples of the present invention have been described in detail, the present invention is not limited to the embodiments and examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. The green high-performance slag micro powder is characterized in that: comprises slag, silicon powder, lithium slag and activated seed crystal.
2. The green high-performance slag micropowder of claim 1, characterized in that: the green high-performance slag micro powder comprises the following components in parts by weight: 80-90 parts of slag, 3-5 parts of silicon powder, 2-4 parts of lithium slag and 0.5-1.5 parts of activated seed crystal.
3. The green high-performance slag micropowder of claim 1, characterized in that: the green high-performance slag micro powder comprises the following components in parts by weight: 90 parts of slag, 5 parts of silicon powder, 4 parts of lithium slag and 1 part of activated seed crystal.
4. The green high-performance slag micropowder of claim 1, characterized in that: the slag is granulated blast furnace slag with the granularity of 200-300 meshes; the granularity of the silicon powder is 200-500 meshes; the granularity of the lithium slag is 200-300 meshes.
5. The green high-performance slag micropowder according to any one of claims 1 to 4, characterized in that: the preparation method of the green high-performance slag micro powder comprises the following steps:
s1, respectively feeding the raw material slag, the silicon powder, the lithium slag and the activated seed crystal into a roller press for rolling;
s2, separating the powder discharged from the roller press by a V-shaped powder separator, separating the obtained fine powder by a rotor powder separator, and separating the obtained coarse powder by magnetic separation and iron removal and then feeding the coarse powder into the roller press;
s3, putting fine powder obtained by powder selection of the rotor powder selector into a ball mill, and returning the obtained coarse powder into a roller press for rolling;
and S4, controlling the raw material proportion and the ball milling parameters in the ball mill to perform ball milling, continuously controlling the raw material proportion and the parameters to perform sand milling after ball milling, and discharging and milling to obtain the green high-performance slag micro powder.
6. The green high-performance slag micropowder of claim 4, characterized in that: s4, controlling the specific surface area of the green high-performance slag micro powder of the finally ground material after ball milling to be 700m2More than kg, and 15 μm of D97.
7. The green high-performance slag micropowder of claim 4, characterized in that: s4, ball milling, namely, adopting a vertical mill; and in the ball milling, firstly, performing primary ball milling on the slag and the activated seed crystal fine powder obtained in the step S3, and adding the silicon powder and the lithium slag fine powder obtained in the step S3 into the obtained material to perform secondary sand milling.
8. The green high-performance slag micropowder of claim 7, characterized in that: the primary ball milling is carried out, wherein yttria-stabilized zirconia ceramic is used as grinding balls, and the mass ratio of the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm to the grinding balls with the diameters of 25mm, 15mm, 10mm and 5mm is (1-4) to (2-6) to 1; s1, ball milling, wherein the ratio of the mass of the milling balls to the total mass of the slag and the activated seed crystal fine powder material is (10-30): 1; the primary ball milling is carried out, the revolution rotating speed of the ball milling speed is 100 plus 400rpm, the rotation rotating speed is 200 plus 800rpm, and the ball milling time is 1-10 h.
9. The green high-performance slag micropowder of claim 7, characterized in that: the grinding balls are made of yttria-stabilized zirconia ceramic materials, the diameters of the grinding balls comprise two or three of 3mm, 1mm and 0.5mm, and the mass ratio of the grinding balls with the diameters of 3mm, 1mm and 0.5mm is (0-2): (0.5-3): 1; the secondary sanding is carried out, wherein the ratio of the mass of the grinding balls to the total mass of the materials is (3-8): 1; the secondary sanding is carried out at the speed of 500-.
10. The green high-performance slag micropowder of claim 4, characterized in that: s1, rolling at the pressure of 100-150 MPa; s2, selecting the powder by using an 80-micron sieve.
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