Method for controlling uniform erosion of bottom blowing bricks and furnace bottom of steel refining furnace

Abstract

The invention provides a method for controlling uniform erosion of bottom blowing bricks and the furnace bottom of a steel refining furnace. The method comprises the following steps of in an earlier stage of furnace service, controlling the slag splashing time to be 1.5-2.5 minutes, the slag splashing gun position to be 0.8-1.5 m and the slag splashing pressure to be 0.8-0.9 MPa for each furnace slag splashing; in middle and later periods of furnace service, performing slag modification treatment according to the mass content of Fe in the slag, and then performing slag splashing for each furnace; and performing fettling maintenance. According to the method for controlling uniform erosion of the bottom blowing bricks and the furnace bottom of the steel refining furnace provided by the invention, the erosion rate of the bottom blowing bricks and the furnace bottom is controlled by means of adjustment of slag splashing schemes in different furnace service periods, steel slag quenching andtempering treatment and the fettling maintenance, so that the purposes of uniformly eroding the bottom blowing bricks and the furnace bottom, improving the bottom blowing stirring effect and guaranteeing the production safety are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling brick blowing at the bottom of a steelmaking furnace and uniform erosion at the bottom of the furnace. Background technique [0002] The top-bottom compound blowing technology has been popularized and applied all over the world because of its good molten pool stirring effect. Bottom blowing has an important contribution to the stirring of the molten pool. A good bottom blowing effect during steelmaking can significantly reduce the oxidation of molten steel and slag, reduce the carbon and oxygen deposition of molten steel at the end point, and improve the quality of molten steel while reducing smelting costs. In actual production, most enterprises improve the bottom blowing effect of the converter by increasing the gas supply intensity of the bottom blowing. It is common that the erosion rate of the bottom blowing bricks is significantly fas...

AI Technical Summary

Problems solved by technology

This method directly leads to a reduction in the number of bottom-blowing gas supply bricks in the converter. With the increase in the age of the smelting furnace, the bottom-blowing mixing effect is significantly reduced, which eventually leads to an increase in the carbon and oxygen deposition of molten steel at the end point, and an increase in the oxidation of molten steel and steel slag, which increases the smelting cost of the converter. At the same time reduce the quality of molten steel

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