Aluminum slag, desulfurizer and desulfurizing method for desulfurization of high silicon molten iron

Abstract

The invention relates to an aluminum slag for desulfurization of molten iron, in particular to an aluminum slag for desulfurization of high silicon molten iron. The invention also relates to a desulfurizer for the high silicon molten iron, and a desulfurizing method for desulfurization of the high silicon molten iron by using the desulfurizer for the high silicon molten iron. The aluminum slag for desulfurization of the high silicon molten iron comprises the following raw materials in percentage by weight: 48%-50% of aluminum powder, 38%-42% of bauxite, 7%-9% of fluorite powder and 2%-3% of pitch coke powder. The desulfurizer for the high silicon molten iron comprises the following raw materials: lime powder, fluorite and the aluminum slag for desulfurization of the high silicon molten iron, wherein the weight ratio of the lime powder to the fluorite to the aluminum slag for desulfurization of the high silicon molten iron is 8.5-9.2: 0.6-1.0: 0.5-0.8. The desulfurizing method for the high silicon molten iron comprises the following steps: (1) front slag skimming; (2) stirring the molten iron, and adding the desulfurizer for the high silicon molten iron into the molten iron in the process of stirring the molten iron; (3) desulfurizing and stirring; and (4) back slag skimming. The invention solves the technical problem that the prior traditional desulfurizer does not have good effect on desulfurization of abnormal molten iron.

Description

technical field [0001] The invention relates to an aluminum slag for desulfurization of molten iron, in particular to an aluminum slag for desulfurization of high-silicon molten iron. The invention also relates to a high-silicon hot metal desulfurizer made by using the aluminum slag for desulfurizing high-silicon hot metal, and a desulfurization method for using the high-silicon hot metal desulfurizer to desulfurize high-silicon hot metal. Background technique [0002] With the improvement of people's living standards, the requirements for the purity of steel products are also getting higher and higher, making the molten iron pretreatment process in the iron and steel industry an indispensable link in steelmaking. At present, the sulfur content of all steel products is below 0.035%, which requires that the sulfur content of molten iron after pretreatment is less than 0.010% (low sulfur steel varieties require [S]≤0.003%). Correspondingly, molten iron pretreatment has higher...

AI Technical Summary

Problems solved by technology

[0015] The first aspect of the purpose of the present invention is to propose an aluminum slag for desulfurization of high-silicon molten iron, which is suitable for desulfurizing high-silicon and low-temperature molten iron, so as to solve the problem of abnormal desulfurization of molten iron by traditional desulfurizers Technical issues that don't work well

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