CN109133694B - High-activity steel slag powder, preparation method and application - Google Patents
High-activity steel slag powder, preparation method and application Download PDFInfo
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- CN109133694B CN109133694B CN201811307950.3A CN201811307950A CN109133694B CN 109133694 B CN109133694 B CN 109133694B CN 201811307950 A CN201811307950 A CN 201811307950A CN 109133694 B CN109133694 B CN 109133694B
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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
- C04B20/023—Chemical treatment
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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
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention relates to a high-activity steel slag powder,The preparation method and the application are that the steel slag tailings and the industrial waste slag are mixed and ground with the chemical excitant; the high-activity steel slag powder comprises the following main chemical components in percentage by mass: 22% -23% SiO2、17％‑18％Al2O3、3％‑4％Fe2O326 to 26.5 percent of CaO and 3 to 3.5 percent of MgO. The steel slag is converted, and the steel slag tailings (the metal mixed into the steel slag is separated and then is called as the steel slag tailings) can be converted into building materials for recycling, so that the consumption of the steel slag is improved, and the harmless recycling treatment process is improved.
Description
Technical Field
The invention relates to the technical field of steel slag recycling, in particular to high-activity steel slag powder prepared from steel slag tailings, a production method and application.
Background
The steel slag is a byproduct generated in steel making, the yield of crude steel in 2016 years in China reaches 8.1 hundred million tons, and the generation rate of the steel slag is 8-15 percent of the yield of the crude steel and reaches about 1.0 hundred million tons. 90% of steel slag is not applied and treated, and the stockpiling of the smelting waste slag stored in the open air not only occupies land, but also pollutes and poisons soil, water and atmosphere, seriously influences the ecological environment, and causes obvious or potential economic loss and resource waste.
At present, the effective technology of harmless and resource treatment of steel slag is a technical problem which needs to be overcome in the field urgently at home and abroad.
Disclosure of Invention
The invention provides high-activity steel slag powder, a preparation method and application, wherein the high-activity steel slag powder is converted from steel slag, can convert steel slag tailings (metal mixed into the steel slag is separated to be called the steel slag tailings) into building materials for recycling, and improves the consumption of the steel slag and the harmless recycling treatment process.
The technical scheme of the invention is as follows:
a high-activity steel slag powder is prepared by mixing and grinding steel slag tailings, industrial waste slag raw materials and a chemical activator;
the high-activity steel slag powder comprises the following main chemical components in percentage by mass: 22% -23% SiO2、17％-18％Al2O3、3％-4％Fe2O3、26％-26.5％CaO、3％-3.5％MgO；
Preferably, the industrial waste residue is waste gypsum and/or solid solution acid-washed cement.
Further, the high-activity steel slag powder comprises the following main chemical components in percentage by mass: 22.4% -22.7% SiO2、17.3％-17.5％Al2O3、3.1％-3.3％Fe2O3、26.1％-26.3％CaO、3.1％-3.3％MgO。
Further, the high-activity steel slag powder comprises the following main chemical components in percentage by mass: 22.65% SiO2、17.5％Al2O3、3.25％Fe2O3、26.2％CaO、3.2％MgO。
Further, in the raw materials, by mass percent:
wherein the steel slag tailings account for 90-95% of the total amount of the raw materials, the industrial waste slag accounts for 5-10% of the total amount of the raw materials,
the dosage of the chemical excitant is 0.02 to 0.1 percent of the total mass of the raw materials;
preferably, the addition amount of the industrial waste residue accounts for 7-8% of the total mass of the raw materials, and the dosage of the chemical exciting agent accounts for 0.05-0.08% of the total mass of the raw materials.
Further, the chemical activator is a surface active agent of dihydric alcohol and/or triethanolamine.
Further, the main chemical components of the steel slag tailings comprise, by mass: 8% -20% SiO2、4％-7％Al2O3、17％-29％Fe2O3、37％-43％CaO、7％-11％MgO。
Further, the specific surface area of the high-activity steel slag powder is 450m2/kg-600m2And/kg, wherein the activity index of the high-activity steel slag powder in 7 days is more than or equal to 72.4 percent and the activity index of the high-activity steel slag powder in 28 days is more than or equal to 77.5 percent, which are measured according to the rubber-sand ratio of 5:5 (the national standard activity rubber-sand ratio of the steel slag powder is 3: 7).
In the high-activity steel slag powder, the particles with the particle size of less than 12 mu m account for more than 80 percent (such as 82 percent, 85 percent, 90 percent, 95 percent and 100 percent) of the total amount.
The invention also provides a method for preparing the high-activity steel slag powder, which comprises the following specific steps:
metering and drying the steel slag tailings, conveying the steel slag tailings to a raw material warehouse, and mixing the steel slag tailings, the industrial slag and a chemical excitant according to a preset proportion;
and grinding the mixed material after burdening to a certain fineness by a ball mill to obtain finished powder.
Preferably, the mixture is sequentially treated by a roller press, a powder concentrator and a dust remover before entering the ball mill;
preferably, the ball mill comprises three bins which are divided by bin separation plates, namely a crushing bin, a rough grinding bin and a fine grinding discharge bin, wherein the length of the crushing bin is greater than that of the rough grinding bin, and the length of the fine grinding discharge bin is greater than the sum of the lengths of the crushing bin and the rough grinding bin;
the fine grinding discharge bin is uniformly divided into a plurality of small bins by the activation lining plates, and the distance between every two adjacent activation lining plates is 1-1.25 m;
the weight of the steel balls loaded in the crushing bin is greater than that of the coarse grinding bin and less than that of the fine grinding bin.
The invention also provides a building material prepared from the high-activity steel slag powder, which is prepared by mixing 20-40% of the high-activity steel slag and 60-80% of slag powder in percentage by mass;
preferably, the building material 7d has an activity index of not less than 95% and 28d has an activity index of not less than 105%.
The invention discloses the technical effects that:
(1) the high-activity steel slag powder provided by the invention has higher activity index and utilization rate.
(2) In the building material prepared by the application, the addition of the high-activity steel slag powder can be increased to more than 30 percent, the consumption rate of the steel slag is improved, the cost of the building material is reduced, and the economic benefit is improved.
Granulated blast furnace slag has been widely used and has a relatively high price, and the selling price of S95 grade slag powder is more than 300 yuan/ton.
The modified steel slag tailings are used for manufacturing high-activity steel slag powder, the main material is industrial slag, the manufacturing cost is less than 70 yuan/ton, the selling price is more than 150 yuan/ton, and the profit and tax are about 80 yuan/ton.
If 30 percent of modified high-activity steel slag powder and 70 percent of slag powder are blended and mixed into building material, the quality reaches the national standard technical index of S95-grade slag powder, and the production cost of the slag powder can be reduced: (300 yuan/ton-150 yuan). times.30% ═ 45 yuan/ton.
If the technology is used for processing 100 ten thousand tons of steel slag tailings to manufacture high-activity steel slag powder, 8000 ten thousand yuan of profit and tax can be created each year; 30 percent of high-activity steel slag powder is equivalently used for replacing 30 percent of slag powder to be mixed to manufacture the building material, and the cost of the slag powder is reduced by 45 yuan/ton.
The technology can solve the problem of steel slag treatment, realize the zero emission of solid waste of the steel slag and has great social benefit.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic structural diagram of a bin of a ball mill provided by the invention, wherein the traveling direction of materials is from left to right;
the reference numbers are as follows: 1-a crushing bin; 2-coarse grinding a bin; 3-finely grinding the materials out of a material bin; 4-a partition panel; 5-activating the lining plate.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
Steel slag is a by-product of steel making, and about 0.12 ton of steel slag is produced per 1 ton of steel. In 2016, the production amount of steel slag in China is about 1.0 hundred million tons, 90 percent of steel slag is not properly applied and treated, and smelting waste slag stored in open air is piled up to occupy land, pollutes and poisons soil, water and atmosphere, seriously influences the ecological environment, and causes obvious or potential economic loss and resource waste.
The invention provides high-activity steel slag powder which can be recycled in a green way. The steel slag waste at present is recycled, the activity of the steel slag waste is obviously improved, and the steel slag waste recycling agent is particularly suitable for recycling of the steel slag.
The high-activity steel slag powder provided by the invention is prepared by mixing and grinding two raw materials of steel slag tailings and industrial waste slag and a chemical activator. The main chemical components of the prepared high-activity steel slag powder comprise the following components in percentage by mass: 22% -23% SiO2、17％-18％Al2O3、3％-4％Fe2O326 to 26.5 percent of CaO and 3 to 3.5 percent of MgO. The high-activity steel slag powder also contains some other trace elements. Preferably, the main chemical components of the prepared high-activity steel slag powder comprise the following components in percentage by mass: 22.4% -22.7% SiO2、17.3％-17.5％Al2O3、3.1％-3.3％Fe2O326.1-26.3% of CaO and 3.1-3.3% of MgO. More preferably, the main chemical components of the high-activity steel slag powder comprise, by mass percent: 22.65% SiO2、17.5％Al2O3、3.25％Fe2O3、26.2％CaO、3.2％MgO。
In the two raw materials of the steel slag tailings and the industrial waste slag, the weight percentage is as follows: the steel slag tailings account for 90-95% of the total amount of the two raw materials, and the industrial waste slag accounts for 5-10% of the total amount of the two raw materials; the dosage of the chemical excitant is 0.02 to 0.1 percent of the total mass of the two raw materials; preferably, the addition amount of the industrial waste residue accounts for 7-8% of the total mass of the two raw materials, and the dosage of the chemical exciting agent accounts for 0.05-0.08% of the total mass of the two raw materials. Most preferably, the addition amount of the industrial waste residue accounts for 7% of the total mass of the two raw materials, and the addition amount of the chemical exciting agent accounts for 0.06% of the total mass of the two raw materials.
The steel slag tailings related to the invention are products obtained by separating metals mixed in steel slag by adopting a conventional method.
The waste gypsum of the present invention may be from any industrial industry, preferably from industrial flue gas wet desulphurization processes.
The solid solution pickling cement of the present invention may be produced in the pickling process of the solid solution process of the stainless steel manufacturing process.
The chemical activator of the invention is preferably a surface active agent of dihydric alcohol and/or triethanolamine, which is a powder dispersed surface active agent or a steel slag active agent, and the formula of the chemical activator can be as follows: 220g/L triethanolamine, 50-80g/L molasses, 5-10g/L sodium nitrite, 30-50g/L sodium lignosulfonate, 12-15g/L sodium chloride, 50-80g/L sodium acetate, 20-30g/L sodium benzoate, 30-50g/L sodium thiocyanate, 50-80g/L dihydric alcohol and the balance of water; preferably, the chemical activator is a steel Slag activator (cargo number ST-05A-Slag) produced by Shenyang Steron additive limited company, and has the functions of solving the problem of electrostatic adsorption and improving the activity of steel Slag powder.
The steel slag tailings mainly comprise the following chemical components in percentage by mass: 8% -20% SiO2、4％-7％Al2O3、17％-29％Fe2O337% -43% of CaO, 7% -11% of MgO, preferably, the chemical composition comprises, by mass percent: 12% -18% SiO2、5％-6％Al2O3、20％-26％Fe2O339-41% of CaO and 8-10% of MgO; more preferably, the chemical composition comprises 16-17% SiO by mass percentage2、5％Al2O3、22％-24％Fe2O3、40％CaO、9％MgO。
The specific surface area of the high-activity steel slag powder provided by the invention can reach 450m2/kg-600m2The activity index of the fertilizer per kg in 7 days is more than or equal to 72.4 percent, and the activity index of the fertilizer per kg in 28 days is more than or equal to 77.5 percent. The test standard for this activity index is a 5:5 grit ratio.
The steel slag powder GB/T20491-2017 used in cement or concrete has the following main technical indexes in national standard:
the high-activity steel slag powder provided by the invention is characterized in that the activity of the steel slag powder obtained from the steel slag tailings after iron removal of the steel slag is greatly improved through a grinding and modification technology, and the steel slag powder is called as the high-activity steel slag powder.
Mixing 30% of the high-activity steel slag powder and 70% of slag powder to blend into new slag powder, and detecting the activity index of the blended slag powder: the 7d activity index is 98.5 percent, the 28d activity index is 108 percent, and the activity index and the specific surface area index are far higher than the national standard indexes of steel slag powder GB/T20491-2017, and are shown in the following table:
the ball milling of the ball mill modified by the invention can lead the particles with the particle size less than 12 mu m in the high-activity steel slag powder provided by the invention to account for more than 80 percent of the total amount, have extremely low fineness, can be applied to cement and concrete in large quantity, can equivalently replace slag to manufacture building materials such as slag powder and the like, and is an effective way for digesting the steel slag.
The method for preparing the high-activity steel slag powder comprises the following steps:
metering and drying the steel slag tailings, conveying the steel slag tailings to a raw material warehouse, and mixing the steel slag tailings, the industrial slag and a chemical excitant according to a preset proportion;
grinding the mixed material after proportioning to a certain fineness by a ball mill to prepare finished powder, preferably, in order to increase the capacity, treating the mixed material by a roller press, a powder concentrator and a dust remover in sequence before entering the ball mill;
as shown in fig. 1, the ball mill comprises three chambers separated by chamber partition plates 4, the direction of the chamber partition plates 4 is perpendicular to the material advancing direction, and the chamber partition plates are respectively a crushing chamber 1, a rough grinding chamber 2 and a fine grinding discharge chamber 3, the length of the crushing chamber 1 is greater than that of the rough grinding chamber 2, and the length of the fine grinding discharge chamber 3 is greater than the sum of the lengths of the crushing chamber 1 and the rough grinding chamber 2;
the fine grinding discharge bin 3 is uniformly divided into a plurality of small bins by the activation lining plates 5, the material grinding process is increased, the arrangement direction of the activation lining plates 5 is vertical to the material advancing direction, and the distance between every two adjacent activation lining plates 5 is 1-1.25 m;
the weight of the steel balls loaded in the crushing bin is greater than that of the coarse grinding bin and less than that of the fine grinding bin. The filling rate of the steel balls in each bin is as follows:
| item | Crushing bin | Rough grinding bin | Fine grinding bin |
| Filling rate | 29％ | 27％ | 30％ |
Through the improvement of the material bin structure of the ball mill, the particle fineness of ball milling powder can be obviously reduced, and the activity of the steel slag powder is improved.
The invention also provides a building material prepared from the high-activity steel slag powder, which is prepared by mixing 20-40% of high-activity steel slag and 60-80% of slag powder in percentage by mass. The activity index of the prepared building material 7d is more than or equal to 95 percent, and the activity index of the prepared building material 28d is more than or equal to 105 percent. The slag powder for doping the high-activity steel slag powder is S95-grade slag powder specified in the national standard granulated blast furnace slag powder for cement, mortar and concrete (GB/T18046-2017).
Example 1 preparation of reactive Steel slag powder A
(1) Taking dried steel slag tailings (from saddle steel, and the main component content (wt%): SiO2 18.20，Al2O3 5.13，Fe2O325.00, cao37.85, mgo9.19), waste gypsum (from flue gas wet desulphurization process) and steel Slag activator (purchased from shenyang stewart admixture limited, cat # ST-05A-Slag), wherein the steel Slag tailings account for 94% of the total mass of the two raw materials, the waste gypsum accounts for 6% of the total mass of the two raw materials, and the steel Slag activator accounts for 0.1% of the total mass of the two raw materials. Mixing the dried steel slag tailings, the waste gypsum and the steel slag activator according to the above mixture;
(2) preparing the mixed material into finished powder by a ball mill shown in figure 1 of the invention; the powder has a particle size of 45 μm and a residue on sieve of 0.5%.
The specific surface area of the high-activity steel slag powder can reach 550m2Kg, with an activity index of 72.4% for 7 days and 77.5% for 28 days.
(3) After the high-activity steel slag powder and the slag powder are mixed according to the mass ratio of 30% of the high-activity steel slag powder to 70% of the slag powder, the activity index of the slag powder in 7 days can be improved to 95.8%, and the activity index of the slag powder in 28 days can be improved to 108%.
The specific performance indexes of the high-activity steel slag powder are as follows, and the high-activity steel slag powder is tested according to a rubber-sand ratio of 5:
at present, no technology with the utilization ratio of steel slag exceeding 20% exists at home and abroad, the technology utilizes 30% of high-activity steel slag powder to be mixed with 70% of slag powder, the 7d activity index of the obtained mixed slag powder is 95.8%, the 28d activity index is 108%, the S105 level standard can be achieved, 35% of high-activity steel slag powder is mixed with 65% of slag powder, and the activity index of the obtained mixed slag powder is not lower than the S95 level standard.
Example 2 preparation of reactive Steel slag powder B
(1) Taking dried steel slag tailings (from Zhanjiang Bao steel, wherein the main component comprises SiO (in percentage by weight)2 8.7，Al2O34.24，Fe2O328.68, cao42.53, mgo10.46), solid solution acid-washing cement (from the acid-washing process of the solid solution process of the 200 series stainless steel manufacturing process) and a steel Slag activator (purchased from stewart additive limited, shengyang, product number ST-05A-Slag), wherein the steel Slag tailings account for 91% of the total mass of the two raw materials, the solid solution acid-washing cement accounts for 9% of the total mass of the two raw materials, and the steel Slag activator accounts for 0.03% of the total mass of the two raw materials. Mixing the dried steel slag tailings, the solid-solution acid-washing glue mud and the steel slag activator according to the above mixture;
(2) preparing the mixed material into finished powder by a ball mill shown in figure 1 of the invention; the powder has a particle size of 45 μm and a residue on sieve of 0.5%.
The specific surface area of the high-activity steel slag powder can reach 540m2The activity index of the product measured according to the rubber-sand ratio of 5:5 is 73.7 percent in 7 days and 78.9 percent in 28 days.
The above examples show that after steel slag or steel slag tailings are ground by chemical excitation modification such as adding 5-10% of industrial waste slag of iron and steel plants and adding 0.02-0.1% of chemical activator of liquid steel slag, the activity of steel slag powder is greatly improved, and then the high-activity steel slag powder is ground to a specific surface area of 450-600 m2The activity indexes of the steel slag powder, namely 7d and 28d, can reach 72.4 percent and 77.5 percent respectively by combining the technical measures, and the activity of the prepared mixed product is very high for the steel slag powder which is not active per se.
By mixing 30% of the high-activity steel slag powder with 70% of slag powder and then carrying out hydration reaction, the activity index of the mixed slag powder 7d is improved to 95.8%, the activity index of the mixed slag powder 28d is improved to 108%, and the activity index of the slag powder and the addition amount of the steel slag powder are obviously improved.
The high-activity steel slag powder disclosed by the invention is expected to play a positive role in accelerating the digestion treatment of the steel slag by steel enterprises, developing the vein industry and realizing the overall national environmental protection goal.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The high-activity steel slag powder is characterized in that the high-activity steel slag powder is prepared by mixing and grinding steel slag tailings, industrial waste slag raw materials and a chemical activator; the high-activity steel slag powder comprises the following main chemical components in percentage by mass: 22% -23% SiO2、17％-18％Al2O3、3％-4％Fe2O3、26％-26.5％CaO、3％-3.5％MgO；
In the high-activity steel slag powder raw material, by mass percent: the steel slag tailings account for 90-95% of the total mass of the raw materials, the industrial waste slag accounts for more than or equal to 5% and less than 10% of the total mass of the raw materials, and the amount of the chemical exciting agent accounts for 0.02-0.1% of the total mass of the raw materials; the industrial waste residue is waste gypsum and/or solid solution acid-washing cement gum; the chemical activator is a surface active agent of dihydric alcohol and/or triethanolamine;
the specific surface area of the high-activity steel slag powder is 450m2/kg-550m2The activity index of the high-activity steel slag powder in 7 days is more than or equal to 72.4 percent and the activity index in 28 days is more than or equal to 77.5 percent, which are measured according to the rubber-sand ratio of 5: 5;
according to the mass percentage, the high-activity steel slag powder is mixed with the S95-grade slag powder by 20-40% to prepare the building material, the activity index of 7d of the building material is more than or equal to 95%, and the activity index of 28d of the building material is more than or equal to 105%.
2. The high-activity steel slag powder according to claim 1,
the high-activity steel slag powder mainly comprises the chemical components in percentage by massThe method comprises the following steps: 22.4% -22.7% SiO2、17.3％-17.5％Al2O3、3.1％-3.3％Fe2O3、26.1％-26.3％CaO、3.1％-3.3％MgO。
3. The high-activity steel slag powder according to claim 1,
the high-activity steel slag powder comprises the following main chemical components in percentage by mass: 22.65% SiO2、17.5％Al2O3、3.25％Fe2O3、26.2％CaO、3.2％MgO。
4. The high-activity steel slag powder according to any one of claims 1 to 3,
in the high-activity steel slag powder raw material, by mass percent: the addition amount of the industrial waste residue accounts for 7-8% of the total mass of the raw materials, and the dosage of the chemical exciting agent accounts for 0.05-0.08% of the total mass of the raw materials.
5. The high-activity steel slag powder according to any one of claims 1 to 3,
the steel slag tailings mainly comprise the following chemical components in percentage by mass: 8% -20% SiO2、4％-7％Al2O3、17％-29％Fe2O3、37％-43％CaO、7％-11％MgO。
6. The high-activity steel slag powder according to any one of claims 1 to 3,
in the high-activity steel slag powder, particles with the particle size smaller than 12 mu m account for more than 80 percent of the total amount.
7. A method for preparing the high-activity steel slag powder as defined in any one of claims 1 to 6, which comprises:
metering and drying the steel slag tailings, conveying the steel slag tailings to a raw material warehouse, and mixing the steel slag tailings, the industrial slag and a chemical excitant according to a preset proportion;
and grinding the mixed material after burdening to a certain fineness by a ball mill to obtain finished powder.
8. The method according to claim 7, wherein the mixture is sequentially processed by a roller press, a powder concentrator and a dust remover before entering the ball mill.
9. The method according to claim 8, wherein the ball mill comprises three chambers separated by a partition plate, a crushing chamber, a rough grinding chamber and a fine grinding chamber, wherein the length of the crushing chamber is greater than the length of the rough grinding chamber, and the length of the fine grinding chamber is greater than the sum of the lengths of the crushing chamber and the rough grinding chamber;
the fine grinding discharge bin is uniformly divided into a plurality of small bins by the activation lining plates, and the distance between every two adjacent activation lining plates is 1-1.25 m;
the weight of the steel balls loaded in the crushing bin is greater than that of the coarse grinding bin and less than that of the fine grinding bin.
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| CN115159871A (en) * | 2022-07-26 | 2022-10-11 | 中国建筑材料科学研究总院有限公司 | Method for exciting steel slag powder cementing material by chemical-physical coupling and application thereof |
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| CN101805142A (en) * | 2010-04-20 | 2010-08-18 | 上海大学 | Preparation method of modified S95-grade slag powder |
| CN105399349A (en) * | 2014-09-05 | 2016-03-16 | 昂国企业有限公司 | High-activity iron and steel slag powder and preparation method thereof |
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| US8985902B2 (en) * | 2011-08-16 | 2015-03-24 | Golder Associates, Inc. | System and method for treating an excavation activity |
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| CN1061355A (en) * | 1990-11-13 | 1992-05-27 | 国家建筑材料工业局合肥水泥研究设计院 | High-yield tube grinder |
| CN101805142A (en) * | 2010-04-20 | 2010-08-18 | 上海大学 | Preparation method of modified S95-grade slag powder |
| CN105399349A (en) * | 2014-09-05 | 2016-03-16 | 昂国企业有限公司 | High-activity iron and steel slag powder and preparation method thereof |
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