Method for reducing slag surface height in converter tapping process

Abstract

The invention belongs to the field of converter steelmaking, and relates to a method for reducing the slag surface height in the converter tapping process, after a gun is lifted at the blowing end point, a slag structure is destroyed by blowing nitrogen, nitrogen is blown after point blowing, the slag structure is destroyed while in-furnace reaction is homogenized and molten steel temperature is compensated, and tapping after stokehold deslagging is avoided. The slag surface height is reduced through nitrogen purging, point blowing and other modes, the method does not affect molten steel hydrogen control, furnace lining maintenance is controllable, the smelting period is shortened, the converter slag surface is effectively reduced, and stable and smooth production is ensured.

Description

technical field [0001] The invention belongs to the field of converter steelmaking and relates to a method for reducing the height of slag level in the converter steel tapping process. Background technique [0002] Converter smelting to the end, the slag surface is high during the tapping process: 1. It will cause mixed flow of steel slag, which will cause the molten steel to return to phosphorus, which will seriously affect the phosphorus control of molten steel; Safety accidents are induced during the process; 3. Continuous slag flows from the furnace mouth. In order to prevent the slag from entering the ladle, the molten steel impacts the inner wall of the ladle and affects the life of the ladle; 4. A large amount of steel slag is ejected from the furnace mouth, posing a threat to the safety of steel car cables. [0003] Existing technologies for controlling the slag surface height during the tapping process of the converter: 1. Keep the nozzle of the oxygen lance in the ...

AI Technical Summary

Problems solved by technology

Among the above methods: reduce the slag surface by oxygen purging, on the one hand, the converter lining is eroded by oxygen erosion, and on the other hand, improper operation will cause the slag to foam, and the slag surface will rise instead of falling, making subsequent operations difficult and affecting the production rhythm of the converter; slag dumping in front of the furnace The method not only causes corrosion to the large surface in front of the converter, but also takes a long time and has a large temperature loss; after blowing, dolomite and other auxiliary materials are added to the furnace to reduce the slag surface and affect the quality of molten steel. Adding slag pressing agent shows that the slag surface has not been effectively reduced