Desulfurization method for vanadium-containing molten iron

Abstract

The invention discloses a desulfurization method for vanadium-containing molten iron. The desulfurization method comprises the following steps of (1) controlling the temperature of molten iron to be greater than or equal to 1250 DEG C; (2) immersing the bottom of a stirrer into the molten iron and stirring; the immersion depth of the bottom of the stirrer into the molten iron is 1100-1200 mm; (3) adding a desulfurizing agent into the molten iron, adjusting the immersion depth of the bottom of the stirrer to be greater than 1200mm, carrying out desulfurization treatment, and stirring by the stirrer until desulfurization is finished; the desulfurizing agent is composed of 87 wt%-90 wt% of lime and 10 wt%-13 wt% of fluorite; and (4) post-slagging. According to the desulfurization method, the phenomena that the molten iron and desulfurization slag are lifted together by gas generated in the desulfurization process, the molten iron and the desulfurization slag overflow out of an iron ladle and the slag and the iron are not separated are avoided, the desulfurization treatment time is shortened, the desulfurization effect is stable, the consumption of a desulfurization agent is reduced, the production efficiency is high, and operation is convenient.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for desulfurizing vanadium-containing molten iron. Background technique [0002] In iron and steel materials, the sulfur content directly affects its performance. Excessive sulfur content in the steel will lead to deterioration of the thermal processing performance of the steel, resulting in "hot embrittlement" of the steel; cracks; the plasticity of steel also significantly deteriorates with the increase of sulfur content; in pure iron or silicon steel sheets, the high sulfur content increases the hysteresis loss. So desulfurization has become one of the main goals in iron and steel smelting. Desulfurization of hot metal is considered to be the main method to reduce the metallurgical load of blast furnace and converter and improve technical and economic indicators, and it has also become an indispensable technical means for smelting low-sulfur clean steel. [0003] A...

AI Technical Summary

Problems solved by technology

[0004] KR (stirring) desulfurization can achieve a deep desulfurization effect by virtue of the dynamic advantages of stirring, thereby reducing the investment in treatment costs, but at the same time there is a relatively large temperature drop of molten iron

After being applied to the desulfurization process of vanadium-containing molten iron, due to the particularity of vanadium-containing molten iron, the unit consumption of desulfurizer increases significantly, and the desulfurization capacity decreases.