Method for preventing low-temperature high-sulfur vanadium-titanium molten iron KR desulfurization bag overflowing

Abstract

The invention discloses a method for preventing ladle overflow of low-temperature high-sulfur vanadium-titanium molten iron in KR desulfurization. The method comprises the following steps: adding 1.5-2.25 kg of silicon carbide per ton of molten iron into a low-temperature high-sulfur vanadium-titanium ladle during KR desulfurization, preferably adding the silicon carbide and a desulfurizing agent into the low-temperature high-sulfur vanadium-titanium ladle at the same time, wherein the SiC content in the silicon carbide is greater than or equal to 75%, the silicon carbide is silicon carbide particles, and the granularity requirement is that the content of particles with the diameter of 1-5 mm is greater than or equal to 90%. According to the method, the phenomenon of bag overflowing can be effectively inhibited, the loss of the molten iron loss is reduced, and smooth desulfurization production is guaranteed.

Description

technical field [0001] The invention relates to the technical field of molten iron pretreatment in iron and steel metallurgy, in particular to a method for preventing KR desulfurization flooding of molten iron with low temperature and high sulfur, vanadium and titanium. Background technique [0002] Sulfur is harmful to most steels. With the increasing quality requirements of steel, the requirements of sulfur content are becoming more and more strict, and the pre-desulfurization of molten iron has become one of the important processes in metallurgical production. KR desulfurization method is desulfurization by mechanical stirring method. It is a cross-shaped stirring paddle formed by pouring refractory materials. After baking, it is inserted into a quantitative molten iron to rotate, so that the molten iron generates a vortex, and then a quantitative desulfurization agent is put into the molten molten iron. The desulfurization reaction occurs in the continuous stirring of th...

AI Technical Summary

Problems solved by technology

[0004] When KR stirring desulfurization is processing low-temperature high-sulfur vanadium-titanium molten iron, because the low-temperature molten iron is not easy to separate from the desulfurization slag, a mixture of slag and iron is formed, resulting in poor venting of the molten iron and desulfurization reaction. The large amount of gas produced cannot be discharged in time. When the accumulated gas is too much and overflows instantly, a large splash of molten iron will occur, causing the slag-iron mixture to overflow out of the desulfurization ladle, which is commonly referred to as the "overlapping" phenomenon

Vanadium and titanium in vanadium-titanium iron water are rare metals with extremely high economic value. The phenomenon of flooding will not only cause loss of molten iron and economic losses, but also cause damage to desulfurization equipment and affect the smooth progress of steelmaking production.

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