Preparation method and application of molten iron composite dephosphorizing agent

Abstract

The invention discloses a preparation method and application of a molten iron composite dephosphorizing agent, and belongs to the technical field of metallurgical industry. The method comprises the following steps: mixing stainless steel tailings from a gas-oxygen refining converter with lime to form mixed powder, adding silicone oil into the mixed powder, grinding, and screening to obtain the composite dephosphorizing agent; in the dephosphorization process, CO2 gas is used as injection gas, the molten iron composite dephosphorization agent is injected into molten iron, and desiliconization and dephosphorization smelting is carried out on steel and iron. According to the method, the N content of the ultra-pure ferritic stainless steel is successfully controlled, meanwhile, the problem of environmental pollution caused by stainless steel tailing treatment is solved, the treatment cost is saved, the lime consumption is reduced, the treatment time is shortened, a good dephosphorization effect is achieved, and the method has practical significance on green development of the iron and steel industry.

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