Steel ladle bottom argon blowing refining method

Abstract

The invention relates to a steel ladle bottom argon blowing refining method. A slit type air brick and a diffuse type air brick are arranged at the circumference of the bottom of a steel ladle. The mode that at the argon blowing stirring stage of the steel ladle, large flow argon blowing is conducted on the slit type air brick and small flow argon blowing is conducted on the diffuse type air brickis adopted; one argon blowing flow is large, and the other argon blowing flow is small; and the uniform mixing effect of argon blowing stirring is improved. At the stage of conducting soft blowing for removing occluded foreign substances, the mode that the small flow argon blowing is conducted on the slit type air brick and the diffuse type air brick is adopted; the occluded foreign substance removal rate is increased; and the whole argon blowing refining time is shortened.

Description

Technical field [0001] The invention relates to a refining method by blowing argon at the bottom of a ladle, and belongs to the technical field of steelmaking in steel metallurgy. Background technique [0002] Argon blowing at the bottom of the ladle is a commonly used technique for refining outside the furnace, which can be roughly divided into two stages: large flow argon blowing, stirring and mixing, and small flow soft blowing to remove inclusions. At present, the domestic refined ladle of more than 100 tons generally uses two bottom-blown venting bricks to blow argon at the same flow rate. The two venting bricks generally use slit-type venting bricks. The following problems or shortcomings exist in actual production: (1) The same flow rate During the argon blowing process, the two streams interfere with each other, offset the energy, and affect the mixing effect of argon blowing and stirring, and it takes a long time to mix; (2) The slit type ventilating brick has a large ga...

AI Technical Summary

Problems solved by technology

At present, domestic refining ladles of more than 100 tons generally adopt the method of blowing argon at the same flow rate of two bottom-blown air bricks. The two air bricks generally use slit-type air bricks. In actual production, there are the following problems or deficiencies: (1) The same flow rate The two streams interfere with each other during the argon blowing process, offset the energy, and affect the mixing effect of the argon blowing and stirring, and the mixing takes a long time; Stirring function is required, but the aperture of the vent hole is relatively large, generally greater than 25 μm, and the argon bubbles formed by argon blowing are relatively large, which affects the metallurgical effect of the argon bubbles to remove inclusions, while the vent hole diameter of the diffused vent brick is small. Generally less than 7.5μm, the argon bubbles formed by argon blowing are small, and the metallurgical effect of argon bubbles to remove inclusions is better, but the gas flow rate is small, which cannot meet the functional requirements of argon blowing, stirring and mixing

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