Slag removing and furnace protecting agent

Abstract

A slag-adjusted furnace-protected agent is composed by the following substances in percentage, 45-80% MgO2, 6-22% CaO, 6-22% C, 5-12% Al2O3 and 1-4% rhenium. The agent is prepared by taking the above raw materials in proportion, mixing them uniformly and molding and forming particles in a granulator to produce spheroids with the diameter of 10-13mm. The invention has the advantages of (1) solving the problem of spraying before smelting; (2) solving the problem of corroding to the furnace lining of the slag during smelting; (3) solving the problem of absorbing liquid steel impurities of the slag; (4) prolonging the service life of the steel-tapping hole bushing and (5) improving the efficiency of slag adjusting and furnace protecting.

Description

technical field [0001] The invention relates to the adjustment of converter steelmaking slag system, in particular to a slag adjusting and furnace protecting agent. Background technique [0002] The slag at the early stage (end) of converter steelmaking and the slag at the end have strong oxidation and low magnesium oxide content, which will affect the splashing in the early stage of smelting, the slag erosion of the furnace lining during the smelting process, and the effect of slag splashing to protect the furnace, shortening the service life of the furnace lining and tapping In particular, the slag with strong oxidizing properties has poor performance in absorbing molten steel inclusions. The slag in the tapping process is easy to cause secondary oxidation of molten steel, and the oxide inclusions in molten steel increase, which affects the purity and quality of molten steel. In the past, the appropriate addition of magnesium-containing materials du...

AI Technical Summary

Problems solved by technology

[0002] The slag at the early stage (finish) of converter steelmaking and the slag at the end have strong oxidation and low magnesium oxide content, which will affect the splashing in the early stage of smelting, the slag erosion of the furnace lining during the smelting process, and the effect of slag splashing to protect the furnace, shortening the service life of the lining and tapping The life of the mouth, especially the slag with strong oxidation, has poor adsorption performance of molten steel inclusions. The slag in the tapping process is easy to cause secondary oxidation of molten steel, and the oxide inclusions in molten steel increase, which affects the purity and quality of molten steel.

In the past, the appropriate addition of magnesium-containing materials during the smelting process only increased the content of magnesium oxide in the slag, but could not reduce the oxidation of the slag, and the effect of slag splashing to protect the furnace was not good.