Process method for improving abnormal conditions of tapping and roughing slag

Abstract

The invention provides a process method for improving abnormal conditions of tapping and roughing slag. The process method comprises the following steps that steel is tapped from a converter, and the slag is roughed when slag stopping fails; a deoxidizing agent, a thick slag modifier and refined lime are added into molten steel; the molten steel enters a CAS refining furnace, aluminum particles are added into molten steel top slag for deoxidation, then a molten steel heat preservation agent is added, and strong argon blowing stirring is adopted for at least first argon blowing time; and argon is closed for oxygen determination, an aluminum wire is fed again after the oxygen determination, then argon blowing and temperature adjustment are conducted on the molten steel, calcium treatment is conducted after soft argon blowing is adopted, and the molten steel heat preservation agent is added after the soft argon blowing lasts for more than second argon blowing time. The aluminum particles and the molten steel heat preservation agent are added in a refining process, the top slag deoxidation modification effect is improved, the inclusion absorption capacity of the top slag is improved, and molten steel inclusions are fully removed; meanwhile, secondary oxidation caused by the fact that the molten steel is exposed and absorbs oxygen in the air is prevented, the cleanliness of the molten steel is improved, the castability of the molten steel is improved, and the quality of a casting blank is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a process method for improving abnormal slag during tapping. Background technique [0002] Out-of-furnace refining of molten steel, for converter blowing-ladle argon blowing-continuous casting pouring process route, if slag blocking failure occurs in the process of converter smelting and tapping, resulting in abnormal slag discharge, the oxygen content in the slag increases, resulting in molten steel secondary Sub-oxidation will increase oxide inclusions and deteriorate the quality of molten steel. In order to reduce the secondary oxidation of molten steel by oxygen in the slag, the method of modifying the top slag is usually adopted to deal with the abnormal situation of slag blocking failure in the process of converter smelting and tapping, but the existing method has a poor effect on the modification of the top slag, even Increased the addition of ...

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a process method for improving the abnormal situation of tapping slag, which is used to solve the poor purity of molten steel in the prior art when slag blocking fails in the tapping process of converter smelting to improve the effect of deslag oxygen removal and fully remove inclusions

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