Method for preventing sulphur from flowing back into liquid steel tank after steel tapping

Abstract

The invention relates to a method for preventing sulphur from flowing back into liquid steel tank after steel tapping. The melting point of top slag is lowered during smelting, the temperature of thetop slag is controlled after casting is finished, the quantity of slag in the liquid steel tank is reduced after casting is finished, and a steel tapping process when liquid steel is contained in theliquid steel tank is selected according to the conditions of liquid steel desulfuration conditions. By means of the method, sulphur is prevented from flowing back into liquid steel tank after steel tapping, the effect that the content of sulphur in the liquid steel is in a controlled state is guaranteed, and thus the stability of the product quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for preventing resulfurization in molten steel tanks after tapping. Background technique [0002] As one of the important indicators of the cleanliness of steel, the sulfur content and sulfide cleanliness in steel have an important impact on the properties of steel. In recent years, with the technological upgrading of related industries and the rapid development of related technologies, users' demand for low-sulfur steel is increasing, and the requirements for sulfur content in steel are becoming more and more stringent. [0003] Steel ladle is a necessary large liquid container for steelmaking production. The molten steel tank is mainly used to contain and carry molten steel and part of the molten slag after the converter is tapped, including transporting the molten steel to the refining treatment, and then sending it to the continuous casting machine f...

AI Technical Summary

Problems solved by technology

[0004] After refining and deep desulfurization, the sulfur content in the top slag of molten steel increases by more than 10 times. If this part of steel slag cannot be turned over after casting, it will remain in the molten steel tank. When the molten steel tank i