CN110981536A - Method and system for preparing steel slag ceramsite - Google Patents
Method and system for preparing steel slag ceramsite Download PDFInfo
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- CN110981536A CN110981536A CN201911364605.8A CN201911364605A CN110981536A CN 110981536 A CN110981536 A CN 110981536A CN 201911364605 A CN201911364605 A CN 201911364605A CN 110981536 A CN110981536 A CN 110981536A
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
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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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/1305—Organic additives
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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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
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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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/138—Waste materials; Refuse; Residues from metallurgical processes, e.g. slag, furnace dust, galvanic waste
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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
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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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
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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Abstract
The invention discloses a method and a system for preparing steel slag ceramsite. The specific method comprises the following steps: grinding the steel slag to 100-500 microns to prepare steel slag powder, and grinding the auxiliary material to 50-200 microns to prepare auxiliary material powder; mixing the binder and water to prepare binding slurry; mixing the steel slag powder, the auxiliary material powder and the bonding slurry in a granulator according to a certain proportion to prepare a ball nut; the ball nut is formed into balls in a ball forming machine to prepare raw material balls, and the raw material balls are dried and then placed in a temperature range of 900-1250 ℃ to be fired to prepare the steel slag ceramsite. The bulk density of the steel slag ceramsite prepared by the method reaches 500kg/m3‑1100kg/m3The cylinder pressure strength reaches 35MPa, the content of free calcium oxide in the ceramsite is lower than 0.5 wt%, the stability is good, the problem of poor stability of the volume of the steel slag is solved, and the large-scale resource utilization of the steel slag is facilitated.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment in the steel industry, and particularly relates to a method and a system for preparing steel slag ceramsite.
Background
The steel slag is solid waste discharged in the steel making process, and the discharge amount is large and can reach about 15 percent of the steel yield. Due to the limitation of application technology, the application rate of the steel slag in China is only about 10%, the steel slag is mainly applied to the field of building materials, a large amount of steel slag is stored in a stacking mode, the steel slag exceeds 2 hundred million tons, a large amount of land is occupied, and environmental pollution such as water sources, atmosphere and the like is caused. If the waste water is not processed and utilized, the waste water causes more serious social problems.
On the other hand, with the development of society and the improvement of the living standard of people, the urban modernization construction pace is continuously accelerated, the required quantity of materials such as required road materials, building materials and the like is rapidly increased, and natural resources such as limestone, clay and the like consumed by producing the materials also cause great pressure to the country. In order to reduce the consumption of the social development on the consumption of natural resources, the full utilization of industrial solid wastes to prepare materials required by construction is a hot spot of the attention of experts in the related field. The steel slag is used for preparing the ceramsite which is used as a road material and a building material aggregate, so that the resource utilization of the steel slag is realized, and the ceramsite is one of the hot spots of research.
However, because the steel slag contains free calcium oxide and free magnesium oxide, the steel slag can expand in volume when meeting water, so that the stability of the steel slag is poor, and the application of the steel slag in road materials is greatly limited. The problem that needs to be solved firstly is to realize the large-scale resource utilization of the steel slag and eliminate the influence of free calcium oxide on the product.
In conclusion, the method has very important significance for reducing the content of free calcium oxide in the steel slag and eliminating the problem of poor stability in the later period.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method and a system for preparing steel slag ceramsite.
In order to achieve the purpose, the invention adopts the technical scheme that:
the method for preparing the steel slag ceramsite is characterized by comprising the following steps of:
step I, grinding the steel slag to 100-500 microns to prepare steel slag powder, and grinding the auxiliary material to 50-200 microns to prepare auxiliary material powder;
step II, preparing a bonding slurry from the bonding agent and water in proportion;
step III, mixing the steel slag powder, the auxiliary material powder and the bonding slurry in a granulator according to a certain proportion to prepare a ball nut;
step IV, placing the ball nut in a ball forming mill to form raw material balls;
v, drying the raw material balls in a dryer;
and VI, placing the dried steel slag raw pellets into a roasting kiln for roasting to prepare the steel slag ceramsite.
Preferably, the auxiliary material is solid waste such as blast furnace slag, clay or waste porcelain, and the binder is dextrin, clay, polyvinyl alcohol or carboxymethyl cellulose.
Preferably, the mass ratio of the binder to the water is (10% to 50%): (50-90 wt%); the mass ratio of the steel slag powder, the auxiliary material powder and the bonding slurry is as follows: (10% -93%): (3% -65%): (4% -25%).
Preferably, after the bonding slurry enters the granulator, the bonding slurry is fully dispersed by the disperser, and the steel slag powder and the auxiliary material powder both enter the granulator in an air flow conveying mode to form a ball nut together with the dispersed bonding slurry. The particle size of the ball mother is 300-1000 microns, the ball mother forms raw material balls in a ball forming mill, the particle size of the raw material balls is 3000 microns
30000 microns.
Preferably, in the step V, the drying temperature is 90-300 ℃, and in the step VI, the firing temperature is 900-1250 ℃.
The invention also provides a system for preparing the steel slag ceramsite, which comprises the following components:
the steel slag pulverizing and grinding machine 1 is used for receiving steel slag feeding and grinding the steel slag into steel slag powder with the particle size of 100-500 microns;
an auxiliary material pulverizer 5 for feeding auxiliary materials and pulverizing the auxiliary materials into auxiliary material powder of 50-200 microns;
a granulator 6, which is connected with the steel slag pulverizer 1, the auxiliary material pulverizer 5 and the bonding slurry tank 3, and is used for mixing the steel slag powder, the auxiliary material powder and the bonding slurry to prepare a ball nut;
a pelletizer 7 connected with the pelletizer 6 to form raw material balls from ball nuts;
a drying chamber 8 connected with the outlet of the balling machine 7 for drying the raw material balls;
and a roasting kiln 9 connected with the outlet of the drying chamber 8, and roasting the dried raw pellets to prepare the steel slag ceramsite.
The roasting kiln 9 is a rotary kiln, and the pelletizer 7 is a rotary drum pelletizer, a disc pelletizer or a rolling pelletizer.
Compared with the prior art, the invention has the beneficial effects that:
(1) after the steel slag and the auxiliary materials are mixed and sintered, the content of free calcium oxide in the steel slag ceramsite can be reduced to be below 0.5 wt%, and the stacking density of the ceramsite reaches 500kg/m3-1100kg/m3The cylinder pressure can reach 35 MPa.
(2) The steel slag ceramsite obtained by the method can be used as paving bricks and building material aggregates on a large scale.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1, the system for preparing steel slag ceramsite of the present invention comprises:
the steel slag pulverizing and grinding machine 1 is connected with steel slag for feeding, grinds the steel slag into steel slag powder with the particle size of 100-500 microns, and stores the steel slag powder in a steel slag powder bin 2;
an auxiliary material pulverizer 5 for feeding auxiliary materials, pulverizing the auxiliary materials into auxiliary material powder of 50-200 microns, and storing the auxiliary material powder in an auxiliary material bin 4;
a bonding slurry tank 3 for storing bonding slurry;
a granulator 6, which is connected with the steel slag pulverizer 1, the auxiliary material pulverizer 5 and the bonding slurry tank 3, and is used for mixing the steel slag powder, the auxiliary material powder and the bonding slurry to prepare a ball nut;
a pelletizer 7 connected with the pelletizer 6 to form raw material balls from ball nuts;
a drying chamber 8 connected with the outlet of the balling machine 7 for drying the raw material balls;
and a roasting kiln 9 connected with the outlet of the drying chamber 8, and roasting the dried raw pellets to prepare the steel slag ceramsite.
In the invention, the auxiliary materials are solid wastes such as blast furnace slag, clay or waste porcelain, the binding agent is dextrin, clay, polyvinyl alcohol or carboxymethyl cellulose, and the like, and the mass ratio of the binding agent to water is (10-50%): (50-90 wt%); the mass ratio of the steel slag powder, the auxiliary material powder and the bonding slurry is as follows: (10% -93%): (3% -65%): (4% -25%), the bonding slurry enters the granulator and is fully dispersed by the disperser, and the steel slag powder and the auxiliary material powder both enter the granulator in an air flow conveying mode to form a ball nut together with the dispersed bonding slurry. The ball mother particle size is 300-1000 microns, the mother ball forms raw material ball in the balling machine, the particle size of raw material ball is 3000-30000 microns, the balling machine 7 is a rotary drum balling machine or a disc balling machine or a rolling balling machine. The drying temperature of the drying chamber 8 is 90-300 ℃, the roasting kiln 9 is a rotary kiln, and the firing temperature is 900-1250 ℃.
The following are several specific examples.
Example 1
(1) Grinding the steel slag by using a steel slag grinder 1 until the sieve residue of 100 microns is not more than 10 percent to prepare steel slag powder, and storing the steel slag powder in a steel slag powder bin 2;
(2) selecting clay as an auxiliary material, grinding the clay to 100 microns with a sieve residue not more than 10% by using an auxiliary material grinder 5 to prepare auxiliary material powder, and storing the auxiliary material powder in an auxiliary material bin 4;
(3) mixing dextrin as binder with water at a ratio of 30 wt%: 70 wt% to obtain binding slurry, and storing in binding slurry tank 3;
(4) feeding 20 wt% of auxiliary powder, 70 wt% of steel slag powder and 10 wt% of binder slurry into a granulator 6, and mixing and granulating to form a spherical nut of about 800 micrometers;
(5) putting the balls into a disc pelletizer to form raw material balls of 5000-10000 microns;
(6) the raw material balls are sent into a rotary drum dryer 8 at the temperature of 130 ℃ for drying for 1 hour, and are fired by a rotary kiln 9 at the temperature of 1030 ℃ to prepare steel slag ceramsite;
(7) the bulk density of the prepared steel slag ceramsite is 950kg/m3, and the cylinder pressure strength is 21 MPa.
Example 2
(1) Grinding the steel slag by using a steel slag grinding machine 1 until the sieved residue of 350 microns is not more than 10 percent to prepare steel slag powder, and storing the steel slag powder in a steel slag powder bin 2;
(2) selecting blast furnace slag as an auxiliary material, grinding the blast furnace slag to 150 microns with a screen residue not more than 10 percent by an auxiliary material grinding machine 5 to prepare auxiliary material powder, and storing the auxiliary material powder in an auxiliary material bin 4;
(3) polyvinyl alcohol is used as a binder, and is mixed with water according to the proportion of (35 wt%: 65 wt%) to prepare binding slurry which is stored in a binding slurry tank 3;
(7) feeding 30 wt% of auxiliary powder, 50 wt% of steel slag powder and 20 wt% of binder slurry into a granulator 6, and mixing and granulating to form spherical nuts of about 600 micrometers;
(8) feeding the ball nut into a disc ball forming mill to form raw material balls of 10000-30000 microns;
(9) the raw material balls are sent into a rotary drum dryer 8 at 150 ℃ to be dried for 1 hour, and are fired at 1080 ℃ through a rotary kiln 9 to prepare steel slag ceramsite;
(10) the bulk density of the prepared steel slag ceramsite is 780kg/m3, and the cylinder pressure strength is 11 MPa.
Example 3
(1) Grinding the steel slag by using a steel slag grinder 1 until the sieve residue of 400 microns is not more than 10 percent to prepare steel slag powder, and storing the steel slag powder in a steel slag powder bin 2;
(2) selecting blast furnace slag and engineering waste soil as auxiliary materials, mixing according to the proportion of (30 wt%: 70 wt%), grinding by an auxiliary material grinding machine 5 until the sieving residue of 100 microns is not more than 10%, preparing into auxiliary material powder, and storing in an auxiliary material bin 4;
(3) dextrin is used as a bonding agent, and is mixed with water according to the proportion of 20wt percent to 80wt percent to prepare bonding slurry which is stored in a bonding slurry tank 3;
(4) feeding 15 wt% of auxiliary powder, 70 wt% of steel slag powder and 15 wt% of binder slurry into a balling chamber 6, and mixing and granulating to form a ball nut of about 500 micrometers;
(5) feeding the ball nut into a disc ball forming mill to form raw material balls of 8000-20000 micrometers;
(6) the raw material balls are sent into a rotary drum dryer 8 at 160 ℃ to be dried for 1 hour, and are fired by a rotary kiln 9 at 1070 ℃ to prepare steel slag ceramsite;
(7) the bulk density of the prepared steel slag ceramsite is 910kg/m3, and the cylinder pressure strength is 19 MPa.
Example 6
(1) Grinding the steel slag by using a steel slag grinder 1 until the sieve residue of 400 microns is not more than 10 percent to prepare steel slag powder, and storing the steel slag powder in a steel slag powder bin 2;
(2) selecting waste porcelain as an auxiliary material, grinding the waste porcelain by an auxiliary material grinding machine 5 until the sieve residue of 150 microns is not more than 10 percent to prepare auxiliary material powder, and storing the auxiliary material powder in an auxiliary material bin 4;
(3) dextrin is used as a bonding agent, and is mixed with water according to the proportion of 10wt percent to 90wt percent to prepare bonding slurry which is stored in a bonding slurry tank 3;
(4) feeding 10 wt% of auxiliary powder, 80 wt% of steel slag powder and 10 wt% of binder slurry into a balling chamber 6, and mixing and granulating to form a ball nut of about 750 micrometers;
(5) feeding the ball nut into a disc ball forming machine to form raw material balls with the diameter of 20000-40000 micrometers;
(6) the raw material balls are sent into a rotary drum dryer 8 at 160 ℃ for drying for 1 hour, and are fired at 10070 ℃ through a rotary kiln 9 to prepare steel slag ceramsite;
(7) the prepared steel slag ceramsite has the bulk density of 970kg/m3 and the cylinder pressure strength of 35 MPa.
Claims (10)
1. The method for preparing the steel slag ceramsite is characterized by comprising the following steps of:
step I, grinding the steel slag to 100-500 microns to prepare steel slag powder, and grinding the auxiliary material to 50-200 microns to prepare auxiliary material powder;
step II, preparing a bonding slurry from the bonding agent and water in proportion;
step III, mixing the steel slag powder, the auxiliary material powder and the bonding slurry in a granulator according to a certain proportion to prepare a ball nut;
step IV, placing the ball nut in a ball forming mill to form raw material balls;
v, drying the raw material balls in a dryer;
and VI, placing the dried steel slag raw pellets into a roasting kiln for roasting to prepare the steel slag ceramsite.
2. The method for preparing steel slag ceramsite according to claim 1, wherein in the step I, the auxiliary material is blast furnace slag, clay or waste porcelain.
3. The method for preparing steel slag ceramsite according to claim 1, wherein in the step II, the binder is dextrin, clay, polyvinyl alcohol or carboxymethyl cellulose.
4. The method for preparing steel slag ceramsite according to claim 1 or 3, wherein in the step II, the mass ratio of the binder to the water is (10% -50%): (50% to 90% by weight).
5. The method for preparing steel slag ceramsite according to claim 1, wherein in the step III, the mass ratio of the steel slag powder, the auxiliary material powder and the bonding slurry is as follows: (10% -93%): (3% -65%): (4% -25%).
6. The method for preparing steel slag ceramsite according to claim 1, wherein in the step III, the bonding slurry enters the granulator and is fully dispersed by the disperser, and the steel slag powder and the auxiliary material powder both enter the granulator in an air flow conveying manner and form a ball nut together with the dispersed bonding slurry.
7. The method for preparing steel slag ceramsite according to claim 1 or 6, wherein in the step III, the particle size of the ball nuts is 300-1000 micrometers, the ball nuts form raw material balls in a ball forming mill, and the particle size of the raw material balls is 3000-30000 micrometers.
8. The method for preparing steel slag ceramsite according to claim 1, wherein the drying temperature in step V is 90-300 ℃, and the firing temperature in step VI is 900-1250 ℃.
9. A system for preparing steel slag ceramsite is characterized by comprising the following components:
the steel slag pulverizing mill (1) is connected with steel slag for feeding, and steel slag is pulverized into steel slag powder with the particle size of 100-500 microns;
an auxiliary material pulverizer (5) for feeding auxiliary materials and pulverizing the auxiliary materials into auxiliary material powder of 50-200 microns;
a granulator (6) connected with the steel slag pulverizer (1), the auxiliary material pulverizer (5) and the bonding slurry tank (3), and mixing the steel slag powder, the auxiliary material powder and the bonding slurry to prepare ball formers;
the granulator (7) is connected with the granulator (6) to form raw material balls from ball nuts;
a drying chamber (8) connected with the outlet of the balling machine (7) for drying the raw material balls;
and the roasting kiln (9) is connected with the outlet of the drying chamber (8) and is used for roasting the dried raw pellets to prepare the steel slag ceramsite.
10. The method for preparing steel slag ceramsite according to claim 9, wherein the roasting kiln (9) is a rotary kiln, and the pelletizer (7) is a drum pelletizer, a disc pelletizer or a rolling pelletizer.
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| CN115849769A (en) * | 2022-12-01 | 2023-03-28 | 武汉市武昌市政建设(集团)有限公司 | Asphalt mixture for urban roads and preparation method thereof |
| CN115893981A (en) * | 2022-10-27 | 2023-04-04 | 广西奥裕环保科技有限公司 | Processing method and processing equipment for iron ore tailing ceramsite |
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| CN115893981A (en) * | 2022-10-27 | 2023-04-04 | 广西奥裕环保科技有限公司 | Processing method and processing equipment for iron ore tailing ceramsite |
| CN115849769A (en) * | 2022-12-01 | 2023-03-28 | 武汉市武昌市政建设(集团)有限公司 | Asphalt mixture for urban roads and preparation method thereof |
| CN115849769B (en) * | 2022-12-01 | 2023-12-08 | 武汉市武昌市政建设(集团)有限公司 | Asphalt mixture for urban road and preparation method thereof |
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