A kind of preparation method of high-efficiency dephosphorization agent for converter steelmaking
A technology of converter steelmaking and dephosphorization agent, which is applied in the field of iron and steel metallurgy, and can solve the problems of inability to meet the continuous production requirements of low phosphorus steel and low dephosphorization efficiency
Active Publication Date: 2022-06-21
XINJIANG BAYI IRON & STEEL
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Problems solved by technology
Obviously, when the lime melting in the molten pool, the basicity of the slag and the FeO content in the slag all increase to meet the dephosphorization conditions, the temperature of the molten steel in the molten pool exceeds the optimum dephosphorization temperature, and the dephosphorization efficiency in the early stage of converter blowing It is very low and cannot meet the continuous production requirements of low phosphorus steel
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[0024] A preparation method of a high-efficiency dephosphorization agent for converter steelmaking, the dephosphorization agent is composed of: converter smelting OG sludge, continuous casting and rolling steel sludge, calcium-based bentonite, calcium carbonate, active lime powder, bauxite, and binder; 1] Converter smelting OG mud, the main mass percentage components are: CaO is 8-15%, SiO 2 3 to 6%, Al 2 O 3 is 2-5%, FeO is 0.5-2%, TFe is 50-53%, S≤0.08%; [2] Continuous casting and rolling sludge: iron oxide scale produced in the continuous casting process, the rolling process is mainly heated by the slab , The iron oxide scale and rolling oil produced in the process of rolling and dephosphorization, in which the TFe content of the iron oxide scale is about 70%; the TFe content of the sludge produced in the continuous casting process and the rolling process is 65%; [3] The composition of the binder is: MgCl 2 Content 16-18.5%, MgSO 4 Content 8%, CaSO 4 Content 1.0%, CaCl ...
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Abstract
The invention discloses a preparation method of a high-efficiency dephosphorization agent for converter steelmaking. The dephosphorization agent is composed of 10% of converter smelting sludge, 70% of continuous casting and steel rolling sludge, 5% of bauxite, and 3% of active lime powder , calcium-based bentonite 2%, calcium carbonate 5%, binder 5%; 4. Use a mixer to fully mix the above ingredients, then add 3.0‑3.5% water to fully digest the lime, and the standing time is greater than 10 days; Make a small amount of water and raw materials fully mixed, add water and sprinkle water with shower head, water pressure 0.015 ~ 0.018MPa; 5. After standing still, use a roller to fully roll the mixed raw materials to increase the compactness of the raw materials; 6. Use The briquetting machine presses the ball into shape, and the formed dephosphorization agent is ellipsoidal, with a maximum diameter of no more than 5 cm, and it can be collected and bagged after natural drying in the air for more than 72 hours. The method of the invention can achieve the purpose of rapid dephosphorization and solve the problem of sewage discharge in iron and steel enterprises.
Description
technical field [0001] The invention relates to the field of iron and steel metallurgy, and relates to a preparation method of a high-efficiency dephosphorization agent for converter steelmaking. Background technique [0002] For smelting high-quality steel, phosphorus in raw materials such as molten iron and scrap steel is usually a harmful element, which will cause the steel to be cold and brittle, and must be removed during the steelmaking production process. There are two methods of descaling in steelmaking: oxidation method and reduction method. The reduction method is usually carried out in the LF reduction refining atmosphere, and the product is a compound of negative trivalent phosphorus. The refining process will emit harmful gases and pollute the environment, and it is rarely used in the field of iron and steel metallurgy. Blow oxygen in the molten iron bath to remove it. However, the degree of phosphorus removal is limited by various conditions. The temperature...
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IPC IPC(8): C21C7/064C21C5/28
CPCC21C7/0645C21C5/28
Inventor 吾塔赵亮冯跃平
Owner XINJIANG BAYI IRON & STEEL