Molten iron desulfurization pretreatment process and method

Abstract

The invention relates to a molten iron desulphurization pretreatment process and method, belongs to the technical field of molten iron desulphurization processes, and solves the problems of poor desulphurization effect, large slag salvaging iron loss and the like of a molten iron desulphurization process. The method comprises the following steps: S1, temperature measurement and sampling are conducted, specifically, temperature measurement and sampling are conducted on molten iron; S2, the injection amount is determined, and the total demand quantity of a desulfurizing agent is determined according to the content of initial sulfur and the type requirement of the steel type; S3, the desulfurizing agent is pre-added, specifically, the desulfurizing agent with the basic demand quantity is pre-added to the bottom of a molten iron ladle; S4, molten iron pouring and desulfurizing agent injection are conducted, specifically, the molten iron in a torpedo ladle is poured into the molten iron ladle, and meanwhile a spraying gun is used for being aligned with falling molten iron flow to spray out the desulfurizing agent; and S5, slag salvaging is conducted, specifically, desulfurization slag floating on the surface of the molten iron is salvaged away from the molten iron ladle through a special slag salvaging machine. According to the method, the desulfurizing agent is released in two directions to react with the molten iron, desulfurization is carried out in a mode of pouring the molten iron while injecting, desulfurization is carried out in cooperation with existing equipment, special slag salvaging equipment is manufactured for salvaging slag, and therefore the purposes of efficient and rapid desulfurization and slag salvaging are achieved.

Description

technical field [0001] The invention belongs to the technical field of molten iron desulfurization technology, and in particular relates to a molten iron desulfurization pretreatment process and method. Background technique [0002] Pre-desulfurization of molten iron and slag removal after desulfurization are one of the indispensable processes for optimizing the metallurgical production process. Desulfurization can reduce the sulfur content of pig iron, reduce the coke ratio of continuous casting ironmaking, increase productivity, and reduce lime consumption in steelmaking And the amount of slag, etc., to reduce production costs, slag removal is to remove the waste slag generated after desulfurization, and remove impurities in the molten iron after desulfurization. [0003] Existing methods for pre-desulfurization of molten iron are mainly divided into three types, injection method, K-R method and composite method: [0004] Injection method: First, the torpedo tank car tran...

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Problems solved by technology

[0008] 1. Injection method, after all the molten iron is poured into the ladle, the desulfurizer is sprayed into the ladle with a spray gun, the desulfurizer can only react with the surface of the molten iron, the desulfurization effect is poor, and the iron loss is large when removing slag ;

[0009] 2. K-R method. After all the molten iron is poured into the ladle, the stirring head is used to stir the molten iron, and then the desulfurizer is sprayed into the ladle with a spray gun, and the vortex formed by rotation is used to fully react the desulfurizer. However, it uses equipment Larger, more investment, larger iron loss during slag removal;

[0010] 3. Composite method. Similarly, after all the molten iron is poured into the molten iron ladle, an auxiliary blowing gas is set on the spray gun, the gas is used to blow the molten iron, and the desulfurizer is fully mixed with the molten iron. The overall desulfurization effect is better than that of the injection method. The K-R method is poor, and its overall equipment occupies a large area, requires a lot of investment, and has a large iron loss during slag removal

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