CN113913585A - Method for reducing proportion of large-size desulfurized slag in molten iron desulfurized slag - Google Patents
Method for reducing proportion of large-size desulfurized slag in molten iron desulfurized slag Download PDFInfo
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- CN113913585A CN113913585A CN202010664842.2A CN202010664842A CN113913585A CN 113913585 A CN113913585 A CN 113913585A CN 202010664842 A CN202010664842 A CN 202010664842A CN 113913585 A CN113913585 A CN 113913585A
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- slag
- molten iron
- desulfurized
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for reducing the proportion of large-size desulfurized slag in molten iron desulfurized slag, which mainly solves the technical problems of high proportion of large-size desulfurized slag and low cooling efficiency of the molten iron desulfurized slag in the existing molten iron desulfurized slag treatment process. The technical scheme is that the method for reducing the proportion of the large-size desulfurized slag in the molten iron desulfurized slag comprises the following steps: 1) adding hot-rolled iron scale into the molten iron desulphurization slag empty slag tank; 2) pouring molten iron desulphurization slag into a molten iron desulphurization slag tank filled with hot-rolled iron scale, and controlling the volume of the molten iron desulphurization slag to be less than or equal to 50% of the volume of the molten iron desulphurization slag tank; 3) carrying out digestion treatment on the molten iron desulphurization slag by using water; 4) slag turning is carried out on the desulfurized slag in the molten iron desulfurized slag tank; 5) and crushing the molten iron desulphurization slag subjected to digestion treatment, and carrying out magnetic separation on the crushed desulphurization slag. The method provided by the invention reduces the proportion of the molten iron desulphurization slag with the block diameter of more than or equal to 500mm in the molten iron desulphurization slag by 25%, and reduces the treatment cost of the molten iron desulphurization slag.
Description
Technical Field
The invention relates to a method for recycling iron in molten iron treatment slag, in particular to a method for reducing the proportion of large-size desulfurized slag in molten iron desulfurized slag, and specifically relates to a method for recycling iron in molten iron desulfurized slag by reducing the proportion of large-size desulfurized slag in molten iron desulfurized slag.
Background
A large amount of waste slag is generated in the production process of ferrous metallurgy, including converter slag, desulfurized slag, casting slag and the like. The main components of the waste residue comprise tricalcium silicate, dicalcium silicate and the like. After years of production practice, the comprehensive utilization technology of waste slag in the steel industry has been developed greatly, and the waste slag is processed by various production processes such as crushing, screening, magnetic separation and the like to finally produce products such as high-grade slag steel blocks, slag steel particles, slag steel powder, slag iron particles, slag iron powder and the like to be returned to steel production for reutilization, while the tailings products can be reused as building materials, cement raw materials, road pavement materials and the like, so that the emission of solid waste of steel is greatly reduced, and the environmental pollution is reduced.
The iron ore powder of the iron-making raw material contains a certain amount of sulfur, and before molten iron enters a steel-making furnace, desulfurization treatment must be carried out outside the furnace so as to reduce the sulfur content of the molten iron and improve the quality of steel. Adding desulfurizing agents such as lime, calcium carbide, soda ash, magnesium powder and the like into molten iron before the molten iron enters a converter for smelting, and carrying out operations such as stirring, slagging-off and the like to obtain the generated metallurgical slag, namely the desulfurized slag.
The skilled person usually refers to the desulfurized slag with the block diameter of more than or equal to 500mm as the large-block diameter desulfurized slag.
The general desulfurized slag treatment process comprises the steps of filling a desulfurized slag tank, adding water, cooling, quenching, turning over slag, carrying out solid-state crushing on desulfurized slag, sorting materials by using an electric trolley, returning iron slag blocks to a steel company, and taking the rest slag as a raw material for construction.
The process mainly has two problems in the cooling and quenching process, one is that the large-block diameter desulfurized slag is too much, the treatment is difficult, and the crushing operation cost is high; secondly, the cooling effect of the high-temperature large-block-diameter desulfurized slag is not ideal, and when the outer surface of the large-block-diameter desulfurized slag is cooled, the core part of the large-block-diameter desulfurized slag is still in a red slag state, so that red slag is contained, a large amount of dust is generated, spray explosion occurs in the slag dumping process, and great potential safety hazards are brought to field operators.
Chinese patent application publication No. CN1199099A discloses a modifying agent for desulfurized slag, which is characterized in that a sodium carbonate desulfurized slag modifying agent is added to desulfurized slag on the surface of a ladle to improve the desulfurization effect, and desulfurized slag is scraped into a slag pot after desulfurization, so that iron is inevitably carried in during the slag scraping process, and slag iron is formed, so that the above problems are not solved by the present patent.
The application publication No. CN104120205A discloses a method for recycling iron in molten iron desulphurization slag, which realizes the recycling of iron in the molten iron desulphurization slag by digesting and crushing the molten iron desulphurization slag, reasonably screening and magnetically separating the molten iron desulphurization slag, but the generation of the desulphurization slag with the block diameter of more than or equal to 500mm can not be controlled from the source.
The prior art lacks a method for effectively reducing the proportion of large-block-diameter desulfurized slag in molten iron desulfurized slag.
Disclosure of Invention
The invention aims to provide a method for reducing the proportion of large-diameter desulfurized slag in molten iron desulfurized slag, which mainly solves the technical problems of high proportion of large-diameter desulfurized slag and low cooling efficiency of the molten iron desulfurized slag in the existing molten iron desulfurized slag treatment process.
The method improves the cooling efficiency of the molten iron desulphurization slag by reducing the proportion of the large-block-diameter desulphurization slag in the molten iron desulphurization slag, thoroughly eliminates the potential safety hazard of the molten iron desulphurization slag treatment operation, improves the recovery rate of iron in the molten iron desulphurization slag, and reduces the recovery cost of iron in the molten iron desulphurization slag.
The technical scheme of the invention is that the method for reducing the proportion of large-diameter desulfurized slag in molten iron desulfurized slag comprises the following steps:
1) adding hot-rolled iron scale into the molten iron desulphurization slag empty tank, wherein the adding amount of the hot-rolled iron scale is 5-10% of the mass of the desulphurization slag planned to be processed by a single tank;
2) pouring molten iron desulphurization slag into a molten iron desulphurization slag tank filled with hot-rolled iron scale, and controlling the volume of the molten iron desulphurization slag to be less than or equal to 50% of the volume of the molten iron desulphurization slag tank;
3) carrying out digestion treatment on the molten iron desulphurization slag by using water, wherein the digestion time is 28-32 h;
4) turning the desulfurized slag in the molten iron desulfurized slag tank, and pouring the desulfurized slag in the molten iron desulfurized slag tank into a slag pool when the temperature of the outer surface of the side wall of the molten iron desulfurized slag tank and the outer surface of the bottom of the tank is less than or equal to 150 ℃;
5) the method comprises the steps of crushing the molten iron desulphurization slag subjected to digestion treatment, crushing the desulphurization slag in a slag pool by a drop hammer method, carrying out magnetic separation on the crushed desulphurization slag, wherein the block diameter of the molten iron desulphurization slag is more than or equal to 10mm, and the molten iron desulphurization slag is used in a steel-returning process or an iron-making process, and is used as a building raw material with the block diameter of less than 10 mm.
Further, in the step 3), the height between the opening of the slag tank and the slag pool is controlled to be less than or equal to 200mm in the process of turning the desulfurized slag in the molten iron desulfurized slag tank.
The block diameter of the large-block-diameter desulphurization slag is more than or equal to 500 mm.
The method of the invention is based on the following research of the applicant:
through years of experimental research, the applicant finds that the excessive amount of molten iron desulphurization slag in a molten iron desulphurization slag tank causes insufficient water quenching treatment of the molten iron desulphurization slag, the internal molten iron desulphurization slag is wrapped together in the cooling process to form large-diameter desulphurization slag, the block diameter of the large-diameter desulphurization slag is larger than or equal to 500mm, the hardness of the large-diameter desulphurization slag is high, the crushing is difficult, the crushing efficiency is low, the large-diameter desulphurization slag is generally decomposed into small-diameter desulphurization slag through a flame cutting process, and the treatment cost of the molten iron desulphurization slag is greatly increased.
The invention adds hot rolling iron scale in the molten iron desulphurization slag empty slag tank, the main component of the hot rolling iron scale is ferric oxide, and W [ FeO ] in the hot rolling iron scale]Not less than 75 percent, carbon can be precipitated from the desulfurized slag containing molten iron in the natural cooling process, the exothermic reductive reaction can be carried out once the carbon meets iron oxide, and the reaction formula is C +2 FeO-2 Fe + CO2×) ×; the reaction is exothermic, and prevents molten iron in the desulfurized slag from wrapping all components together due to natural cooling interconnection to generate large desulfurized slag iron blocks, so that the formation of large desulfurized blocks is reduced, and hot rolled iron scale is a solid waste resource generated by steel companies and required to be treated, so that the resource is sufficient, and the enterprise cost is not increased. Through multiple tests, the addition amount is 5-10% of the amount of the desulphurization slag processed by the slag pot plan.
According to the invention, the slag removing amount in the desulfurization slag tank is not more than half of the volume of the slag tank, water is added for quenching treatment, the water reacts with calcium oxide in the desulfurization slag to expand, the expansion force destroys the just formed slag iron block or prevents the formation of slag iron blocks, and further the generation amount of the desulfurization slag iron blocks is reduced. The principle that free calcium oxide in the slag reacts with water to produce light calcium oxide and has an expansion effect is utilized, so that the desulfurization slag is loosened due to expansion, the desulfurization slag is promoted to be fully separated from iron particles and iron powder, and the chemical reaction is as follows: CaO + H2O＝Ca(OH)2
The quenching time of the water quenching and cooling is not less than 28h, so that the components in the slag are fully reacted, and the red slag in the slag is fully cooled, so that the problems that the red slag is contained, a large amount of dust is generated and spray explosion occurs in the slag dumping process due to non-ideal cooling effect are avoided, and great potential safety hazards are brought to field operators.
Through years of experimental research, the applicant finds that when the temperature of the side and the bottom of the slag tank is not higher than 150 ℃, the interior of the desulphurization slag does not contain red slag, and the slag turning operation is safe and controllable.
Compared with the prior art, the invention has the following positive effects: 1. the method provided by the invention reduces the proportion of the molten iron desulphurization slag with the block diameter of more than or equal to 500mm in the molten iron desulphurization slag by 25%, and reduces the treatment cost of the molten iron desulphurization slag. 2. The desulphurization slag has good quenching effect, no red slag or spray explosion phenomenon occurs during slag turning, and the operation safety of molten iron desulphurization slag treatment is improved.
Detailed Description
The invention is further described below with reference to specific examples.
Embodiment 1, a method for reducing the proportion of large-size desulfurized slag in molten iron desulfurized slag comprises the following steps:
1) adding hot-rolled iron scale into the molten iron desulphurization slag empty tank, wherein the adding amount of the hot-rolled iron scale is 5-10% of the mass of the desulphurization slag planned to be processed by a single tank;
2) pouring molten iron desulphurization slag into a molten iron desulphurization slag tank filled with hot-rolled iron scale, and controlling the volume of the molten iron desulphurization slag to be less than or equal to 50% of the volume of the molten iron desulphurization slag tank;
3) carrying out digestion treatment on the molten iron desulphurization slag by using water, wherein the digestion time is 30 h;
4) turning the desulfurized slag in the molten iron desulfurized slag tank, and pouring the desulfurized slag in the molten iron desulfurized slag tank into a slag pool when the temperature of the outer surface of the side wall of the molten iron desulfurized slag tank and the outer surface of the bottom of the tank is less than or equal to 100 ℃, wherein the height between the tank opening of the slag tank and the slag pool is controlled to be less than or equal to 200mm in the process of turning the slag;
5) the method comprises the steps of crushing the molten iron desulphurization slag subjected to digestion treatment, crushing the desulphurization slag in a slag pool by a drop hammer method, carrying out magnetic separation on the crushed desulphurization slag, wherein the block diameter of the molten iron desulphurization slag is more than or equal to 10mm, and the molten iron desulphurization slag is used in a steel-returning process or an iron-making process, and is used as a building raw material with the block diameter of less than 10 mm.
The method comprises the following steps that the desulfurized iron slag blocks generated by an original process of a certain company for five months continuously are 3856 tons, 4181 tons, 4021 tons, 3998 tons, 4032 tons and 3958 tons respectively, after the method is adopted, the desulfurized iron slag blocks generated by the company for five months continuously are 2716 tons, 2937 tons, 2806 tons, 2935 tons and 2886 tons respectively, and the reduction amounts of the desulfurized iron slag blocks are 29.56%, 29.75%, 29.81%, 27.20% and 27.08% respectively; meanwhile, red slag and dust are not generated in all slag turning processes, and spray explosion is avoided, so that the safety of operating personnel and operating equipment is greatly improved, and the environmental pollution is reduced.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (2)
1. A method for reducing the proportion of large-size desulfurized slag in molten iron desulfurized slag is characterized by comprising the following steps:
1) adding hot-rolled iron scale into the molten iron desulphurization slag empty tank, wherein the adding amount of the hot-rolled iron scale is 5-10% of the mass of the desulphurization slag planned to be processed by a single tank;
2) pouring molten iron desulphurization slag into a molten iron desulphurization slag tank filled with hot-rolled iron scale, and controlling the volume of the molten iron desulphurization slag to be less than or equal to 50% of the volume of the molten iron desulphurization slag tank;
3) carrying out digestion treatment on the molten iron desulphurization slag by using water, wherein the digestion time is 28-32 h;
4) turning the desulfurized slag in the molten iron desulfurized slag tank, and pouring the desulfurized slag in the molten iron desulfurized slag tank into a slag pool when the temperature of the outer surface of the side wall of the molten iron desulfurized slag tank and the outer surface of the bottom of the tank is less than or equal to 150 ℃;
5) the method comprises the steps of crushing the molten iron desulphurization slag subjected to digestion treatment, crushing the desulphurization slag in a slag pool by a drop hammer method, carrying out magnetic separation on the crushed desulphurization slag, wherein the block diameter of the molten iron desulphurization slag is more than or equal to 10mm, and the molten iron desulphurization slag is used in a steel-returning process or an iron-making process, and is used as a building raw material with the block diameter of less than 10 mm.
2. The method for reducing the proportion of the large slag iron in the molten iron desulphurization slag according to claim 1, wherein in the step 3), when the desulphurization slag in the molten iron desulphurization slag tank is turned, the height between the tank opening of the slag tank and the slag pool is controlled to be less than or equal to 200 mm.
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