Slagging smelting method for prolonging service life of steel ladle

Abstract

The invention provides a slagging smelting method for prolonging the service life of a steel ladle, which comprises the following steps of: 1, synthesizing a raw material from natural minerals at high temperature, crushing, adding a binder, pressing into balls, molding, drying, and preparing slagging balls which meet the following requirements on the following components and particle sizes: Na < + > is more than or equal to 27 percent, F <-> is more than or equal to 40 percent, CaO is more than or equal to 4 percent, SiO2 is less than or equal to 1.5 percent, Al2O3 is more than or equal to 20 percent, and the particle size is 10-50mm; 2, the slag melting balls are put into a standby feeding system stock bin; step 3, adding slag melting balls in the refining process when the high-carbon steel is smelted, wherein the adding time is that the slag melting balls are added after the lime is added in the refining process; the most ideal addition amount for prolonging the service life of the steel ladle is 50kg per furnace on average and 0.5 kg per ton of steel. According to the invention, the purposes of rapidly melting slag, reducing scouring and erosion of high-oxidability slag to a furnace lining, prolonging the service life of a steel ladle and prolonging the service life of a refining furnace can be achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a slag smelting method for improving the service life of a ladle. Background technique [0002] When smelting low-carbon aluminum-killed steel (molten steel temperature 1585-1625°C, carbon content 0.03-0.25%), the molten steel temperature in the ladle is high, the deoxidation product is mainly Al2O3, and the slagging material added is mainly lime, which is a high melting point oxide , slow slagging, desulfurization, inclusion control is not ideal. In order to speed up the slag removal, a large amount of fluorite is added in the conventional process to promote the slag removal, but the fluorite severely corrodes the refractory material, resulting in a short life of the ladle slag line, which seriously affects the production rhythm and the safety of the ladle. At the same time, fluorite is harmful to the environment and the human body. The amount of fluorite used should be reduced and th...

AI Technical Summary

Problems solved by technology

[0002] When smelting low-carbon aluminum-killed steel (molten steel temperature 1585-1625°C, carbon content 0.03-0.25%), the molten steel temperature in the ladle is high, the deoxidation product is mainly Al2O3, and the slagging material added is mainly lime, which is a high melting point oxide , slow slagging, unsatisfactory control of desulfurization and inclusions

In order to speed up the slag removal, a large amount of fluorite is added to the conventional process to promote the slag removal, but the fluorite severely corrodes the refractory material, resulting in a short life of the ladle slag line, which seriously affects the production rhythm and the safety of the ladle.

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