CN112010579A - Production method of superfine steel slag powder - Google Patents
Production method of superfine steel slag powder Download PDFInfo
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- CN112010579A CN112010579A CN202010931383.XA CN202010931383A CN112010579A CN 112010579 A CN112010579 A CN 112010579A CN 202010931383 A CN202010931383 A CN 202010931383A CN 112010579 A CN112010579 A CN 112010579A
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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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- 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
- C04B18/142—Steelmaking slags, converter slags
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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
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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
Abstract
The invention discloses a production method of ultrafine steel slag powder, wherein the specific surface area is 400-600m2The fine steel slag powder with the specific surface area of 700m is sorted out by a first classifier2The activity of the steel slag powder in the ratio table is close to or reaches the level of S95-grade slag powder by adopting the production process. The steel slag powder with the specific surface area can be mixed with S95 grade mineral powder to carry out 1: 1, compounding to produce modified mineral powder exceeding S95 grade.
Description
Technical Field
The invention relates to a process for recycling steel slag, in particular to a production method of superfine steel slag powder which has strong activity and can replace mineral powder for producing cement concrete, and belongs to the technical field of energy conservation and environmental protection.
Background
At present, industrial solid wastes become a serious obstacle to the development of green industry in China. The steel slag is waste slag discharged in the steel making process of the steel industry, and accounts for about 10-20% of the yield of crude steel. As industrial solid waste, the waste is not effectively utilized for a long time, and is discharged and accumulated in a large amount, thereby causing serious pollution to the environment. How to solve the problem of effective utilization becomes a major issue.
The steel slag contains the gelled substance of silicate cement, so that the steel slag has potential hydraulic activity and can be used as a cement admixture and a concrete cementing material. However, the steel slag has relative specificity in physical and chemical properties, so that it cannot be fully used, the actual utilization rate is less than three, and the remaining seven components are discarded, and the following points are mainly found for the reason:
1. the steel slag components in various places are different, the hydraulic activity is slowly exerted, and no effective way is available for fully exerting the steel slag activity.
2. The steel slag has high hardness and poor grindability. Simple substance iron, ferric oxide and RO in the steel slag are difficult to be removed, so that the grinding efficiency is greatly reduced.
3. Free calcium oxide, magnesium oxide and other substances contained in the steel slag not only cause poor stability of the steel slag, but also easily cause ball pasting and ball wrapping in the superfine grinding process, thereby greatly reducing the grinding efficiency.
At present, the traditional steel slag powder grinding industrialized production process can only be implemented at the specific surface area of 400-600m2The operation was horizontal in kg. The traditional process flow is as follows:
1. pre-crushing. And a step-by-step crushing mode is adopted, and iron is selected by using a traditional magnetic roller between each step. Crushing to a particle size of about 0-1cm, magnetically separating iron, and discarding.
2. Grinding by using a vertical mill or a closed-circuit ball mill, and removing iron in the grinding process.
(1) The lower end of the vertical mill is provided with a slag discharge port through which slag is discharged and iron is removed, and slag mainly comprises substances which are difficult to mill and are equal to RO. And then carrying out iron phase enrichment by using a magnetic roller.
(2) The main way of removing iron in the ball mill is to select iron in the pipeline by adopting a common magnetic roller.
A magnetic roller is usually additionally arranged at the upper material port of a grinding head and a tail grinding elevator for iron selection. The iron selection mode has great disadvantages. When the steel slag is finely ground, the iron phase and other effective components are adhered together by agglomeration. When selecting iron, the effective components of the steel slag powder are inevitably adhered together, which causes waste and seriously affects the iron selection efficiency.
At present, a novel high-efficiency iron removal device appears in the market, and magnetic rollers are additionally arranged at the inlet of a tail grinding chute, the inlet of a coarse powder chute of a powder concentrator and the like. Feeding the material above the inclined notch by using the wind power of a blower below the inclined notchThe steel slag powder falling from the pipe is scattered by wind power through the air permeable layer of the chute, and iron is selected by the magnetic roller. Compared with the mode that the magnetic roller is additionally arranged at the upper material opening of the grinding head and the tail grinding elevator to select iron, the iron selecting efficiency is high, but the iron selecting efficiency is reduced to different degrees due to the influence of a plurality of practical factors such as feeding amount, material particle size, material flow rate and the like. In fact, when the specific surface area of the steel slag powder reaches 300m2At above/kg, the effect of scattering by the wind power of the blower is greatly reduced.
3. Grinding to a specific surface area of 400-2And when the concentration is/kg, the finished product is obtained.
Specific surface area 400-550m2The actual utilization rate of the steel slag powder per kg is low. The steel slag powder with the specific surface area has lower activity and has stability problem. Mainly, free calcium oxide and magnesium oxide are still in the form of granules, can not be fully hydrated in the early stage, influence the activity and the later-stage stability, and are not suitable for replacing mineral powder, fly ash and other cementing materials with cement and concrete. Only the steel slag powder is continuously and superfinely ground to the specific surface area of 700m2Above/kg, the desired activity can be achieved. The superfine powdered steel slag powder effectively dissociates the aggregates of free calcium oxide and magnesium oxide, and the later stability problem is fundamentally improved, so that the superfine powdered steel slag powder can be greatly added into cement and concrete.
However, the scale 400-550m produced under the conventional production process2If the steel slag powder per kg is continuously subjected to superfine grinding, the phenomenon of ball pasting and ball wrapping seriously occurs, and the grinding efficiency is reduced.
As is well known, the ball pasting phenomenon is caused by a series of reasons such as over-grinding of particles, viscosity of powder, excessive moisture and the like. As for the steel slag powder, magnesium oxide, free calcium oxide, phosphorus pentoxide and the like contained in the steel slag powder belong to substances easy to grind, and the substances are easy to adsorb a grinding body in the process of superfine grinding. Meanwhile, the steel slag powder also contains a large amount of difficult-to-grind substances such as dicalcium silicate and RO, so that two extremes can appear in the superfine grinding process, namely when the difficult-to-grind substances do not reach the effective specific surface area, the easy-to-grind substances are excessively ground, and the ball-pasting and ball-wrapping phenomena are very prominent. Once the grinding body is adsorbed by substances such as superfine magnesium oxide, free calcium oxide, phosphorus pentoxide and the like, the grinding body is difficult to fall off. In fact, it is sufficient to explain that the ball-out phenomenon is more likely to occur when the calcium oxide, the magnesium oxide and the like are ground separately than when many other materials are ground.
Meanwhile, the iron phase cannot be effectively removed by a relatively simple iron removing process, so that the grindability of the material is reduced, the grinding body of the superfine grinding machine is easily eaten by the micro-iron, the consumption of the grinding body and the phenomenon of ball coating by paste balls are accelerated, the grinding efficiency is quickly reduced, and the iron cannot be effectively discharged in the superfine grinding machine, so that the iron accumulation is serious, the discharge grid plate is blocked, and the production is finally stopped. The above problem is that the steel slag does not realize the ratio of 700m2The main reason for continuous production of/kg in fine and large scale.
Disclosure of Invention
The invention aims to solve the technical problems of iron removal and ball pasting in the grinding process of steel slag powder, and provides a production method of superfine steel slag powder, which can greatly reduce the iron content in the steel slag powder, avoid the ball pasting phenomenon, provide favorable conditions for the subsequent processing and utilization of steel tailings and obviously improve the additional value of the utilization of the steel slag.
In order to solve the problems, the invention adopts the following technical scheme:
a production method of ultrafine steel slag powder, the specific surface area is 400-600m2The fine steel slag powder with the specific surface area of 700m is sorted out by a first classifier2And (5) grinding the residual coarse powder of the qualified product with the volume of more than one kg in a ball mill.
The following is a further optimization of the present invention to the above scheme:
the materials ground by the ball mill also enter the same first classifier for classification and the specific surface area is selected to be 700m2The qualified product of more than/kg, thereby forming a closed cycle.
The other optimization scheme is as follows:
the materials ground by the ball mill enter a second classifier for classification and the specific surface area is selected to be 700m2Over kg qualified product, and coarse powderReturning to the ball mill for continuous grinding to form a closed cycle.
And mixing and homogenizing the qualified products sorted by the first classifier and the qualified products sorted by the second classifier to obtain final products.
Further optimization: the method adopts a medium-fineness ball mill and a powder selecting machine to perform closed-circuit grinding, and the steel slag coarse powder is ground into the powder with the specific surface area of 400-600m2Steel slag fine powder between/kg.
The grinding process is a transition process between coarse grinding and ultrafine grinding, and aims to enable the next ultrafine grinding process to be feasible by adopting a semi-finish grinding process or an ultrafine grading and finish grinding process. As mentioned above, when the powder is ground to an average specific surface area of 400-600m2In the range of/kg, most of the active ingredients with high grindability and high paste sphericity, such as free calcium oxide, magnesium oxide, dicalcium silicate and tricalcium silicate, reach qualified fineness, and can be separated out first to avoid the problems of paste grinding and paste sphericity in the process of further superfine grinding, reduce the pressure of the superfine grinding, and improve the efficiency of the superfine grinding to reduce the comprehensive power consumption.
Further optimization: before closed-circuit grinding by adopting a medium-fineness ball mill and a powder concentrator, crushing the steel slag coarse powder by 1) to remove iron; 2) coarse grinding; 3) and (3) air separation and classification, and preparing the steel slag fine powder.
Further optimization: the air separation and classification is to separate and filter an iron phase with 5-30% of coarse particles and large specific gravity from an inert RO (reverse osmosis) phase by utilizing an air classifier through the action of gravity and centrifugal force.
Further optimization: and (3) performing closed-circuit grinding by using a medium-fineness ball mill and a powder selecting machine, and separating 20-50% of active ingredients by using a superfine classifier. The active ingredients include free calcium oxide, magnesium oxide, dicalcium silicate, tricalcium silicate, etc.
Because the grindability of different mineralogical components in the steel slag is greatly different, when the steel slag is ground to the average specific surface area of 400m2After more than kg, the active ingredients with high grindability and high dexterous property, such as free calcium oxide, magnesium oxide, dicalcium silicate and tricalcium silicate, and the like reach qualified fineness for most parts, and can be separated out firstly, and the separation proportion is determined according to the contentThe height can be adjusted between 20-50%.
Thus, the steel slag powder particles entering the final superfine grinding process have good grindability and high paste sphericity, and the iron phase which is difficult to grind is removed as far as possible, so that the grindability of the residual materials can be kept basically consistent, the problem of paste sphericity is solved, and the superfine grinding efficiency is improved to reduce the comprehensive power consumption.
Further optimization: the ball mill adopts a single-bin ball mill or a two-bin or three-bin ball mill, and the length-diameter ratio is 3-5.
The invention adopts the production process to produce the product with the specific surface area of 700m2Over/kg of superfine steel slag powder. The activity of the steel slag powder under the ratio table is close to or reaches the level of S95 grade slag powder. The steel slag powder with the specific surface area can be mixed with S95 grade mineral powder to carry out 1: 1, compounding to produce modified mineral powder exceeding S95 grade.
The invention solves the problem of ball pasting and ball wrapping in the process of superfine grinding, and finally realizes continuous and efficient production. The iron content in the steel slag powder can be greatly reduced, the phenomenon of ball pasting is avoided, favorable conditions are provided for subsequent processing and utilization of the steel tailings, and the additional value of steel slag utilization is remarkably improved.
The invention is further described with reference to the following figures and examples.
Drawings
FIG. 1 is a general process flow chart of the method for producing ultrafine steel slag powder in example 1 of the present invention;
FIG. 2 is a flow chart of a medium-fine closed circuit grinding process in embodiment 1 of the present invention;
FIG. 3 is a flow chart of the ultrafine semi-final milling process in embodiment 1 of the present invention;
FIG. 4 is a flow chart of the process of ultrafine classification and ultrafine finish grinding in embodiment 2 of the present invention.
Detailed Description
In the embodiment, as shown in fig. 1 to 3, a method for producing ultra-fine steel slag powder includes the steps of:
1. crushing and deironing:
according to the size of the steel tailings, the steel tailings can be crushed by adopting a step-by-step crushing and iron selecting mode until the granularity is about 0-1cm, and the crusher can be in different crushing modes such as jaw crushing, hammer crushing, impact crushing, cone crushing, rod mill and the like.
A vertical shaft type double-rotor impact crusher can be adopted, the maximum feeding size can reach 50mm, the material can be crushed to 2mm at one time, the fineness of the material is more than 90%, and 100% of the material is less than 5 mm.
Because the crusher has high selective crushing degree and fine materials, the crushed materials are separated from the metallic iron by adopting low-intensity magnetic separation, the separation grade can reach 85 percent, the separation rate can reach 80 percent, and the metallic iron content of the tailings after separation can be reduced to below 0.5 percent at least.
And the slag is crushed to the granularity of about 0-1cm by adopting a conventional crushing rod milling process, and the metal iron content of the final tailing material after magnetic separation and iron removal is usually 2-3%.
The content of the metallic iron is obviously reduced, favorable conditions are provided for the subsequent processing and utilization of the steel tailings, and the additional value of the utilization of the steel slag is obviously improved by extracting the metallic iron.
2. Coarse grinding: using a vertical mill, a roller press or a ball mill to perform coarse grinding until the specific surface area is 150-2Between/kg.
3. Air classification and grading:
before the steel slag powder after coarse grinding enters a lower-stage grinding process (medium-fineness ball mill closed circuit grinding), an air classifier is used for separating and filtering an iron phase with coarse particles and large specific gravity and an inert RO (reverse osmosis) phase through a slag discharge port below the classifier under the action of gravity and centrifugal force. As mentioned above, since the iron phase and the RO phase are hard to be ground and have high specific gravity, and the active material is easy to be ground and have low specific gravity, when the iron phase and the RO phase are coarsely ground to a specific surface area of 150-300m2At the time of/kg, the mass size difference between the separated iron-phase inert substance particles and the active substance particles is obvious, and the iron-phase inert substance particles and the active substance particles can be efficiently separated by utilizing an air classifier through the action of gravity and centrifugal force.
The process designs a non-magnetic iron selection mode for high-efficiency iron phase removal. The iron phase coarse powder particles selected by the classifier can be continuously subjected to one or more deironing by using modes such as pipeline deironing and the like, and the aim of iron phase enrichment is fulfilled. The fine powder is effectively extracted in the wind classification, so that the dispersibility and the magnetic separation efficiency of coarse powder particles are improved, the magnetic separation iron removal can adjust the magnetic field intensity according to actual requirements at the moment to further improve the iron phase enrichment efficiency and the enrichment grade, the residual powder after iron enrichment and selection has higher RO phase content, and actually, the RO phase has certain activity in the later period after superfine pulverization, and is also a supplement for the later activity of the steel slag powder. Therefore, the RO phase residual powder separated in the process can be filtered and independently used as a product (used as a wear-resistant material or a cement iron correction material and the like) or can be used as an effective component and enter the next grinding process together with the fine powder pumped by the classifier.
The process has the advantages that the iron phase filtering process is designed before the fine grinding in the ball mill, so that the phenomenon that the iron phase enters into a grinding body to be worn and is accumulated in the mill is solved, and favorable conditions are provided for the medium-fineness grinding in the next process (the grinding body is worn to increase the ball pasting phenomenon and reduce the grinding efficiency and the like, and the accumulated iron phase in the mill can cause a series of phenomena of blockage of a discharging grid plate, reduction of the grinding efficiency, grinding expansion, increase of the grinding temperature, ball pasting and the like).
The air classifier can be various existing common air powder separators, including O-sepa type powder separator, three-separation type powder separator, dynamic powder separator, rotor type powder separator, etc.
4. Closed-circuit grinding of medium-fineness ball mill and powder selecting machine
The specific surface area of the steel slag powder ground by the process is 400-600m2Between/kg. The grinding process is a transition process between coarse grinding and ultrafine grinding, and aims to enable the next process to be feasible by adopting a semi-finish grinding process or an ultrafine grading and finish grinding process.
Because the grindability of different mineralogical components in the steel slag is greatly different, when the steel slag is ground to the average specific surface area of 400m2After the content of the components is more than kg, most of the components such as free calcium oxide, magnesium oxide and the like with high grindability and high dexterous property reach qualified fineness, and can be separated out firstly, and the separation proportion can be adjusted between 20 and 50 percent according to the content.
So as to avoid the problems of paste milling and paste ball during further superfine milling, reduce the pressure of the superfine milling, improve the efficiency of the superfine milling and reduce the comprehensive power consumption.
The ball mill can be a two-bin or three-bin ball mill, and the length-diameter ratio is generally 3-5.
The powder selecting machine can be various conventional wind power powder selecting machines, including O-sepa type powder selecting machine, three-separation type powder selecting machine, dynamic powder selecting machine, rotor type powder selecting machine, etc.
5. Superfine semi-final grinding: the specific surface area is 400-600m2The fine steel slag powder with the specific surface area of 700m is sorted out by a first classifier2And (5) grinding the residual coarse powder of the qualified product with the volume of more than one kg in a ball mill.
The materials ground by the ball mill also enter the same first classifier for classification and the specific surface area is selected to be 700m2The qualified product of more than/kg, thereby forming a closed cycle.
Thus, the steel slag powder particles entering the final superfine grinding process have good grindability and high paste sphericity, and the iron phase which is difficult to grind is removed as far as possible, so that the grindability of the residual materials can be kept basically consistent, the problem of paste sphericity is solved, and the superfine grinding efficiency is improved to reduce the comprehensive power consumption.
The ball mill in the process adopts a single-bin ball mill, and the length-diameter ratio is generally 3-5.
The classification in the process can adopt the following patent numbers: 201120566728.2, the patent names: vertical multi-rotor classifier, or patent number: 201120566722.5, the patent names: a separate horizontal multi-rotor classifier; or the patent numbers are: 201120566693.2, the patent names: a separate vertical multi-rotor classifier, etc.
The production process flow provided by the invention can produce the specific surface area of 700m2Over/kg of superfine steel slag powder. The activity of the steel slag powder under the ratio is close to or reaches the level of slag powder. The steel slag powder with the specific surface area can be compounded with S95 grade mineral powder to produce modified mineral powder exceeding S95 grade.
Comparison of the following experimental data, fully showing the chart 600m2Common steel slag powder and specific surface below/kg700 m2The difference of the activity strength of the superfine steel slag powder above/kg.
The steel slag samples are respectively from two domestic steel mills A, B.
The following are steel slag powder A and B prepared from steel slag of different domestic steel mills A and B.
A steel mill: a1: 716 m/kg A2: 453 m/kg A3: 594 m/kg
B, steel works: b1: 728 m/kg B2: 448 m/kg B3: 572 m/kg
C group: benchmark P.042.5 cement
And (2) S group: reference S95 slag powder (specific surface area 416 m/kg)
See table below for specific activity assay data.
In the activity test detection, the proportion of the reference cement to the series of mixed materials is 1: 1, namely 225 g: 225 g.
As can be seen from the data, the ultrafine steel slag powder ground to above ratio table 700 m/kg has activity close to that of the S95 mineral powder. When the superfine steel slag powder and the S95 mineral powder are compounded to prepare modified mineral powder, the activity of the modified mineral powder exceeds that of standard S95 mineral powder and is even higher than that of standard cement. The steel slag powder with the common specific surface area has very low activity and can not achieve the purpose of replacing mineral powder.
In conclusion, it is possible to produce ultra fine steel slag powder. The production process provided by the invention is a set of steel slag ultrafine grinding process flow with positive significance, and can be used for continuously producing fine products with a ratio table of 700 m/kg in a large scale, so that the utilization rate and the additional value of the steel slag are greatly improved.
In the embodiment 2, as shown in fig. 4, after the step 4 in the embodiment 1, the semi-finished product can be directly put into a first classifier to sort out qualified ultra-fine powder to obtain a product 1, and the coarse powder is put into a ball mill for grinding;
meanwhile, the material ground by the ball mill enters a second classifier to sort out qualified ultrafine powder to obtain a product 2, and the residual coarse powder returns to the ball mill to be continuously ground, so that a closed cycle is formed.
And mixing and homogenizing the product 1 and the product 2 to obtain a final product. The average specific surface area of the superfine steel slag powder ground by the process is not less than 700m2/kg。
The superfine grading and final grinding process is adopted for solving the problem of ball pasting and ball wrapping in the superfine grinding process and finally realizing continuous and efficient production. In the production process of the set of steel slag powder, the steel slag powder ground in the step 4 already contains a large amount of superfine micro powder, and the micro powder reaches the required specific surface area and can be directly collected as a finished product.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (10)
1. A production method of superfine steel slag powder is characterized in that: the specific surface area is 400-600m2The fine steel slag powder with the specific surface area of 700m is sorted out by a first classifier2And (5) grinding the residual coarse powder of the qualified product with the volume of more than one kg in a ball mill.
2. The method for producing ultrafine steel slag powder according to claim 1, wherein: the materials ground by the ball mill also enter the same first classifier for classification and the specific surface area is selected to be 700m2The qualified product of more than/kg, thereby forming a closed cycle.
3. The method for producing ultrafine steel slag powder according to claim 1, wherein: the materials ground by the ball mill enter a second classifier for classification and the specific surface area is selected to be 700m2And (5) returning the residual coarse powder to the ball mill for continuous grinding to form a closed cycle for qualified products with the volume of more than one kg.
4. The method for producing ultrafine steel slag powder according to claim 3, wherein: and mixing and homogenizing the qualified products sorted by the first classifier and the qualified products sorted by the second classifier to obtain final products.
5. The method for producing ultrafine steel slag powder according to claim 4, wherein: the method adopts a medium-fineness ball mill and a powder selecting machine to perform closed-circuit grinding, and the steel slag fine powder is ground into powder with the specific surface area of 400-600m2Steel slag powder between/kg.
6. The method for producing ultrafine steel slag powder according to claim 5, wherein: before closed-circuit grinding by adopting a medium-fineness ball mill and a powder concentrator, crushing the steel slag coarse powder by 1) to remove iron; 2) coarse grinding; 3) and (3) air separation and classification, and preparing the steel slag fine powder.
7. The method for producing ultrafine steel slag powder according to claim 6, wherein: the air separation and classification is to separate and filter an iron phase with 5-30% of coarse particles and large specific gravity from an inert RO (reverse osmosis) phase by utilizing an air classifier through the action of gravity and centrifugal force.
8. The method for producing ultrafine steel slag powder according to claim 5, wherein: and (3) after closed-circuit grinding by using a medium-fineness ball mill and a powder selecting machine, separating 20-50% of active ingredients by using a classifier.
9. The method for producing ultrafine steel slag powder according to any one of claims 1 to 3, wherein: the ball mill adopts a single-bin ball mill, and the length-diameter ratio is 3-5.
10. The method for producing ultrafine steel slag powder according to any one of claims 5, 6 and 8, wherein: the ball mill adopts a two-bin or three-bin ball mill, and the length-diameter ratio is 3-5.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115180849A (en) * | 2022-06-22 | 2022-10-14 | 龙岩市全鸿建材有限公司 | Efficient and energy-saving preparation method of superfine steel slag powder |
| CN115353310A (en) * | 2022-09-09 | 2022-11-18 | 安徽工业大学 | Cement mixed material using superfine tire vertical mill steel slag to replace mineral powder and preparation method thereof |
| CN115403299A (en) * | 2022-07-08 | 2022-11-29 | 连云港长瑞环保科技有限公司 | Preparation method and application of superfine material soil stabilizer |
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| CN115321862A (en) * | 2022-08-19 | 2022-11-11 | 山东欣润同创环保科技有限公司 | Steel slag modified grinding process |
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| CN115403299A (en) * | 2022-07-08 | 2022-11-29 | 连云港长瑞环保科技有限公司 | Preparation method and application of superfine material soil stabilizer |
| CN115353310A (en) * | 2022-09-09 | 2022-11-18 | 安徽工业大学 | Cement mixed material using superfine tire vertical mill steel slag to replace mineral powder and preparation method thereof |
| CN115353310B (en) * | 2022-09-09 | 2023-05-16 | 安徽工业大学 | Mixed material for cement with superfine tire vertical mill steel slag to replace mineral powder and preparation method thereof |
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