CN108380360B - Production process of steel slag and iron fine powder - Google Patents

Production process of steel slag and iron fine powder Download PDF

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Publication number
CN108380360B
CN108380360B CN201810123141.0A CN201810123141A CN108380360B CN 108380360 B CN108380360 B CN 108380360B CN 201810123141 A CN201810123141 A CN 201810123141A CN 108380360 B CN108380360 B CN 108380360B
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China
Prior art keywords
powder
slag
flue gas
iron
solid
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CN201810123141.0A
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CN108380360A (en
Inventor
白金德
陈列
丁万鑫
王忠晓
王建军
杨延鹏
李风建
宋晓炜
蔡全财
李洪军
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XINING SPECIAL STEEL CO Ltd
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XINING SPECIAL STEEL CO Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00Disintegrating plant with or without drying of the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00Auxiliary 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
    • B02C23/08Separating or sorting of material, associated with crushing or disintegrating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/30Combinations with other devices, not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00Making metallic powder or suspensions thereof
    • B22F9/02Making metallic powder or suspensions thereof using physical processes
    • B22F9/04Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00Making metallic powder or suspensions thereof
    • B22F9/02Making metallic powder or suspensions thereof using physical processes
    • B22F9/04Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling

Abstract

The invention discloses a production process of steel slag iron fine powder, which comprises the steps of carrying out magnetic separation and coarse crushing on solid slag, carrying out magnetic separation and fine crushing on the solid slag, grinding the solid slag in a ball mill, separating out particle steel and slag powder from a ground product through a drum screen, wherein the particle steel is a final product, the slag powder is separated out tailings and coarse powder through a double-rotor powder separator, the tailings are a final product, the coarse powder is separated out tailings and steel slag iron fine powder through a magnetic separation drum, low-temperature flue gas introduced by a high-temperature fan is mixed with high-temperature flue gas in a flue gas furnace and then enters the ball mill, the low-temperature flue gas is a drying agent for drying the solid slag and is a carrier for conveying part of the tailings, gas-solid two-phase separation is realized in a bag-type dust collector, the gas is discharged into the atmosphere through. The invention adopts the negative pressure control technology in the whole process except the crushing process, and has the advantages of no generation of circulating sewage and dust, no influence of climate on production, effective improvement of grade of steel slag refined iron powder, reduction of steel-making production cost and the like.

Description

Production process of steel slag and iron fine powder
Technical Field
The invention relates to the field of mineral separation, in particular to a production process of steel slag iron fine powder.
Background
The solid slag of ferrous metallurgy is produced in the iron making and steel making processes of iron and steel enterprises, the output of the solid slag is about 13-20% of the steel output, the annual output of the solid slag in China currently exceeds 1 hundred million tons, and the iron content reaches 15-20% and is about 1500-2000 ten thousand tons. Therefore, many manufacturers at home and abroad research and develop the recycling and comprehensive utilization of solid slag, but the most widely used up to now is steel slag iron fine powder extracted after crushing and magnetic separation, the iron content of the steel slag iron fine powder is only 35% -55%, the steel slag iron fine powder is used for iron making, sintering and batching, and tailings are used as raw materials for manufacturing cement.
If the iron in the solid slag can not be effectively extracted, the crushing and grinding difficulty is increased for the ultrafine powder process, the product quality is influenced, and a large amount of iron resources are wasted. Under the conditions of short iron ore resources and high and constant selling price, the economic and reasonable recovery process is adopted to improve the recovery rate of iron in the solid slag, thereby not only obtaining remarkable economic benefit, but also having important significance in realizing sustainable development of steel and iron in China and building beautiful China.
At present, there are wet methods in the prior art for recovering iron from solid slag: and (3) grinding quantitative solid slag in a ball mill, separating the ground product into particle steel and slag powder through a drum screen, wherein the particle steel is a final product, and separating the slag powder into fine slag iron powder and tail mud through a magnetic separator. In order to inhibit dust prevention, a large amount of water is added into the ball mill and recycled. In order to improve the magnetic separation efficiency, a large amount of circulating water is added into the magnetic separator, and the magnetic separation process is carried out under the action of buoyancy. The steel slag iron fine powder and the tail mud separated by the magnetic separator flow into respective separation tanks along with the circulating water, and are dewatered by using the empty water while being lifted by a stirring machine after being precipitated. The whole process flow is shown in figure 1. However, this process has the following disadvantages: 1. circulating water easily pollutes underground water; 2. in northern areas, the production line is forced to stop production due to cold winter; 3. the difference between the total iron content of the steel slag fine iron powder and the tailings is small, the utilization rate of a magnetic field is low, and the recovery rate is low; 4. harmful elements such as phosphorus, bismuth and the like are circularly enriched, so that the steel-making cost is increased; 5. the components of the molten iron are difficult to meet the smelting requirement of part of special steel.
In the prior art, iron in solid slag is recovered by a dry method: and removing iron from the solid slag by two steps, crushing by three steps, grinding in a rod mill, screening out materials larger than 8mm and smaller than 8mm by using a roller, separating out coarse particles and particle steel by using a magnetic separation roller larger than 8mm, returning the coarse particles to the rod mill for grinding again, and separating out coarse particle steel and fine particle steel from fine particle steel by using a roller screen. And (3) separating steel slag iron fine powder and primary tailings by using a tailing control sieve with the diameter less than 8mm, and separating the steel slag iron fine powder and the tailings again by using a magnetic separation roller from the primary tailings, wherein the whole process flow is shown in figure 2. However, this process also has the following disadvantages: 1. the dust concentration in the production field is high, and the working environment is severe; 2. the difference between the total iron content of the steel slag fine iron powder and the tailings is small, the utilization rate of a magnetic field is low, and the recovery rate is low; 3. harmful elements such as phosphorus, bismuth and the like are circularly enriched, so that the steel-making cost is increased; 4. the components of molten iron are difficult to meet the smelting requirement of part of special steel; 5. the processing or transporting equipment is easy to harden and difficult to clean.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a production process of steel slag iron fine powder, which ensures that the production is not influenced by weather, does not generate circulating sewage and dust in the process, reduces the circulating enrichment of harmful elements such as phosphorus, bismuth and the like and the process transportation amount, realizes clean and continuous production, improves the recovery rate of total iron, and reduces the transportation cost and the blast furnace fuel cost.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a production process of steel slag and iron fine powder comprises the following steps:
s1, carrying out magnetic separation on the solid slag by using a No. 1 iron remover to separate magnetic iron;
s2, roughly crushing the solid slag obtained in the step S1 by using a 1# jaw crusher to obtain solid slag particles with the particle size of less than or equal to 80 mm;
s3, carrying out magnetic separation on the solid slag particles obtained in the step S2 by using a No. 2 iron remover to separate magnetic iron;
s4, screening and separating the solid slag particles obtained in the step S3 by using a vibrating screen to obtain solid slag particles with the particle size of less than or equal to 40mm, and finely crushing filter residues by using a No. 2 jaw crusher to obtain solid slag particles with the particle size of less than or equal to 40 mm;
s5, feeding all solid-state slag particles with the particle size of less than or equal to 40mm obtained in the step S4 into a ball mill for grinding, simultaneously introducing hot flue gas into the ball mill, separating the ground solid-state slag particles into particle steel and slag powder through a drum screen, feeding the slag powder into a double-rotor powder concentrator, simultaneously feeding the hot flue gas discharged from the ball mill with a small amount of tailings into the double-rotor powder concentrator and a cloth bag powder collector, separating the slag powder from tailings and coarse powder through the double-rotor powder concentrator, feeding the hot flue gas discharged from the double-rotor powder concentrator with a large amount of tailings into a cloth bag dust collector to realize two-phase separation, discharging the gas into the atmosphere through a main exhaust gas-solid fan, and obtaining solid tailings; wherein the main exhaust fan is used for extracting hot flue gas in the ball mill and the double-rotor powder concentrator through the cloth bag powder collector so as to form negative pressure in the ball mill and the double-rotor powder concentrator;
and S6, separating tailings from the coarse powder separated by the double-rotor powder separator in the step S5 by a magnetic separation roller to obtain the steel slag iron fine powder.
Specifically, the hot flue gas in step S5 is introduced from a hot blast stove or a heating furnace by a high temperature fan, and the hot flue gas is a drying agent for drying solid slag and a carrier for conveying a part of tailings.
As an improvement to the above technical solution, in step S5, a flue gas furnace is disposed near the ball mill, coal gas and combustion-supporting air are combusted in the front half section of the flue gas furnace through a burner to generate high-temperature flue gas, and then the high-temperature flue gas is mixed with low-temperature hot flue gas of a high-temperature fan in the rear half section of the flue gas furnace and introduced into the ball mill.
Compared with the prior art, the invention has the beneficial effects that:
1. the total iron content of the steel slag iron fine powder is improved, the solid slag amount and the process transportation amount can be effectively reduced, the proportion of the uniformly mixed ore and the grade of the sinter are effectively improved, and the transportation cost and the blast furnace fuel cost are favorably reduced.
2. The cyclic enrichment of harmful elements such as phosphorus, bismuth and the like is reduced, the content of the harmful elements in the molten iron is effectively reduced, the smelting requirements of part of special steel can be met, and the production cost of a steelmaking process is reduced.
3. The production process has no circulating sewage, and the pollution to underground water is avoided.
4. Except the crushing process, the whole process adopts a negative pressure control technology, no dust is raised on the production site, and the working environment is improved.
5. The production is not influenced by climate, and the northern area can continuously produce all the year round.
Drawings
FIG. 1 is a process flow diagram of a prior art wet recovery process for iron in solid slag.
FIG. 2 is a process flow diagram of a prior art dry recovery process for iron from solid slag.
FIG. 3 is a process flow diagram of the present invention.
Detailed Description
The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.
First, the abbreviations and keywords in the present invention are explained as follows:
magnetic separation of iron: refers to magnetic lumps selected from solid slag.
Particle steel: the method is characterized in that metal particles with the particle size larger than 8mm are screened out after solid slag is crushed, magnetically separated and ground.
Steel slag and iron fine powder: the method is characterized in that after solid slag is crushed, magnetically separated and ground, powder or particles with the granularity less than 8mm and the total iron content more than 50% are magnetically separated.
Tailings: the method refers to a product obtained by extracting magnetically separated iron, particle steel and steel slag iron fine powder from solid slag.
As shown in fig. 3, the process for producing steel slag iron fine powder of the embodiment includes the following steps:
s1, carrying out magnetic separation on the solid slag by using a No. 1 iron remover to separate magnetic iron;
s2, roughly crushing the solid slag obtained in the step S1 by using a 1# jaw crusher to obtain solid slag particles with the particle size of less than or equal to 80 mm;
s3, carrying out magnetic separation on the solid slag particles obtained in the step S2 by using a No. 2 iron remover to separate magnetic iron;
s4, screening and separating the solid slag particles obtained in the step S3 by using a vibrating screen to obtain solid slag particles with the particle size of less than or equal to 40mm, and finely crushing filter residues by using a No. 2 jaw crusher to obtain solid slag particles with the particle size of less than or equal to 40 mm;
s5, feeding all solid-state slag particles with the particle size of less than or equal to 40mm obtained in the step S4 into a ball mill for grinding, simultaneously introducing hot flue gas into the ball mill, separating the ground solid-state slag particles into particle steel and slag powder through a drum screen, feeding the slag powder into a double-rotor powder concentrator, simultaneously feeding the hot flue gas discharged from the ball mill with a small amount of tailings into the double-rotor powder concentrator and a cloth bag powder collector, separating the slag powder from tailings and coarse powder through the double-rotor powder concentrator, feeding the hot flue gas discharged from the double-rotor powder concentrator with a large amount of tailings into a cloth bag dust collector to realize two-phase separation, discharging the gas into the atmosphere through a main exhaust gas-solid fan, and obtaining solid tailings; wherein the main exhaust fan is used for extracting hot flue gas in the ball mill and the double-rotor powder concentrator through the cloth bag powder collector so as to form negative pressure in the ball mill and the double-rotor powder concentrator;
and S6, separating tailings from the coarse powder separated by the double-rotor powder separator in the step S5 by a magnetic separation roller to obtain the steel slag iron fine powder.
Wherein, the hot smoke in the step S5 is introduced from a hot blast stove or a heating furnace by a high-temperature fan, and the hot smoke is not only a drying agent for drying solid slag, but also a carrier for conveying partial tailings; in order to supplement the temperature of hot flue gas, a flue gas furnace is arranged near a ball mill, flame-associated gas and combustion-supporting gas are introduced into a burner, flame-associated air and combustion-supporting air are introduced through a combustion-supporting fan, high-temperature flue gas is generated by combustion in the front half section of the flue gas furnace, then the high-temperature flue gas is mixed with low-temperature hot flue gas of a high-temperature fan in the rear half section of the flue gas furnace and then introduced into the ball mill, a diffusion valve and a cold-mixing valve are arranged before the mixed flue gas is introduced into the ball mill according to requirements, and diffusion and cold-mixing treatment are carried.
The invention does not produce circulating sewage and dust in the production process, is not influenced by weather, avoids polluting underground water, effectively improves the working environment, improves the grade of the steel slag iron concentrate powder, reduces the circulating enrichment and process transportation amount of harmful elements such as phosphorus, bismuth and the like, and reduces the production cost of the steel-making process.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims (3)

1. The production process of the steel slag and iron fine powder is characterized by comprising the following steps of:
s1, carrying out magnetic separation on the solid slag by using a No. 1 iron remover to separate magnetic iron;
s2, roughly crushing the solid slag obtained in the step S1 by using a 1# jaw crusher to obtain solid slag particles with the particle size of less than or equal to 80 mm;
s3, carrying out magnetic separation on the solid slag particles obtained in the step S2 by using a No. 2 iron remover to separate magnetic iron;
s4, screening and separating the solid slag particles obtained in the step S3 by using a vibrating screen to obtain solid slag particles with the particle size of less than or equal to 40mm, and finely crushing filter residues by using a No. 2 jaw crusher to obtain solid slag particles with the particle size of less than or equal to 40 mm;
s5, feeding all solid-state slag particles with the particle size of less than or equal to 40mm obtained in the step S4 into a ball mill for grinding, simultaneously introducing hot flue gas into the ball mill, separating the ground solid-state slag particles into particle steel and slag powder through a drum screen, feeding the slag powder into a double-rotor powder concentrator, simultaneously feeding the hot flue gas discharged from the ball mill with a small amount of tailings into the double-rotor powder concentrator and a cloth bag powder collector, separating the slag powder from tailings and coarse powder through the double-rotor powder concentrator, feeding the hot flue gas discharged from the double-rotor powder concentrator with a large amount of tailings into a cloth bag dust collector to realize two-phase separation, discharging the gas into the atmosphere through a main exhaust gas-solid fan, and obtaining solid tailings; wherein the main exhaust fan is used for extracting hot flue gas in the ball mill and the double-rotor powder concentrator through the cloth bag powder collector so as to form negative pressure in the ball mill and the double-rotor powder concentrator;
and S6, separating tailings from the coarse powder separated by the double-rotor powder separator in the step S5 by a magnetic separation roller to obtain the steel slag iron fine powder.
2. The process for producing the steel slag fine iron powder according to claim 1, which is characterized in that: the hot flue gas in the step S5 is introduced from a hot blast stove or a heating furnace by a high-temperature fan.
3. The process for producing the steel slag fine iron powder according to claim 2, which is characterized in that: in the step S5, a flue gas furnace is disposed near the ball mill, coal gas and combustion-supporting air are combusted in the front half section of the flue gas furnace through a burner to generate high-temperature flue gas, and then the high-temperature flue gas is mixed with low-temperature hot flue gas of a high-temperature fan in the rear half section of the flue gas furnace and introduced into the ball mill.
CN201810123141.0A 2018-02-07 2018-02-07 Production process of steel slag and iron fine powder Active CN108380360B (en)

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Publication number Priority date Publication date Assignee Title
CN110947515A (en) * 2019-12-17 2020-04-03 攀枝花钢城集团有限公司 Method for preparing fine-fraction steel slag used as admixture of cement and concrete
CN114045365B (en) * 2021-10-09 2022-11-18 西宁特殊钢股份有限公司 Steel slag treatment process and application of obtained tailings
CN114226044A (en) * 2021-11-17 2022-03-25 湖南信港实业有限公司 Steel slag iron removal process

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CN1189413C (en) * 2002-06-19 2005-02-16 北京高路通科技发展有限公司 Process for treating steel slag
CN100383260C (en) * 2006-06-06 2008-04-23 济南鲍德炉料有限公司 Process for producing steel slag iron fine powder
CN101864501A (en) * 2010-06-22 2010-10-20 新兴河北工程技术有限公司 Method for recycling iron from steel slag
CN102168155B (en) * 2011-03-17 2012-09-05 天津苏美尔环保投资有限公司 Production process of steel slag micro-powder
CN103045777B (en) * 2012-12-17 2014-04-02 王新军 Dry processing technique for iron-containing steel slag

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