A Furnace Protection Method of Slag Splashing for Controlling Converter Furnace Type

Abstract

The invention belongs to the field of converter steelmaking, and particularly relates to a slag-splashing converter protection method for controlling converter profiles. The slag-splashing converter protection method includes the following steps that (1) after tapping of a converter is finished, the converter is rocked to a converter body zero position; (2) an oxygen lance is operated, when the lance position drops to a standard lance position which is 4 m to 6 m away from the converter bottom, a nitrogen stop valve is opened, blowing of nitrogen splashing slag is started, in the blowing process, the lance position continuously drops to the position 0.7 m to 2.5 m away from the converter bottom, and the position which is 0.7 m to 2.5 m away from the converter bottom serves as a slag-splashing converter protection final point to fix the lance position; and (3) according to the condition of sheet or granulate converter slag flashed out of a converter opening, the slag-splashing effect is judged, the slag-splashing time is well controlled, and the lance is lifted to pour the converter slag after slag splashing is finished. The slag-splashing converter protection method is adopted for conducting slag-splashing converter protection operation, the converter lining inside profile is basically controllable after slag splashing is carried out, increasing changes are avoided, and according to original brick erosion condition seen after converter disassembling after the converter campaign is ended, original bricks at key sites are not damaged seriously; and in the normal production and using process of the converter campaign, accidents of redness of a converter shell and steel diffusion do not occur.

Description

technical field [0001] The invention belongs to the field of converter steelmaking, and in particular relates to a slag splash protection method for controlling the furnace type of the converter. Background technique [0002] At present, the converters of major steel mills use slag splashing to protect the furnace body to maintain the furnace body. The high-temperature terminal slag that is saturated or supersaturated with magnesium oxide is used to evenly coat the surface of the furnace lining under the blowing and splashing of high-pressure nitrogen. , and well integrated with the furnace lining to form a dense protective layer, thereby reducing the erosion of molten steel, protecting the furnace lining, and improving the life of the furnace lining. This method is easy to cause phenomena such as too thick slag splashing layer, raised furnace bottom, and changes in the inner shape of the furnace lining during operation, which will change the furnace type and furnace volume ...

AI Technical Summary

Problems solved by technology

This method is easy to cause phenomena such as too thick slag splashing layer, raised furnace bottom, and changes in the inner shape of the furnace lining during operation, which will change the furnace type and furnace volume ratio of the converter, which will affect the control of the converter smelting process and lead to the failure of the smelting process. The carbon-oxygen reaction is uneven, which is not conducive to achieving effective endpoint hits

At the same time, the change of the furnace type causes the fluctuation of carbon and oxygen accumulation in the double-blown converter, which affects the control of the economic and technical indicators of the converter