100-400mm large-particle dolomite fettling method for large face of converter

Abstract

The invention belongs to the technical field of steelmaking, and particularly provides a 100-400mm large-particle dolomite fettling method for a large face of a converter. The 100-400mm large-particledolomite fettling method for the large face of the converter comprises the following steps that the step (1), after steel tapping operation of the converter is finished, converter slag which has a certain fluidity and is appropriate in alkalinity is selected, and slag splashing operation is not conducted after the steel tapping operation is finished; the step (2) large-particle dolomite is pouredinto the converter through a scrap steel bucket, specifically, the material size of the dolomite ranges from 100mm to 400mm; and the step (3) after the large-particle dolomite is added to the converter, the converter is immediately shaken to be about 88-95 degrees, and remains for 8-12 minutes, after the situation that the slag face is stable and does not roll over is observed, slag splashing andfurnace protection operation is conducted, and the residual slag in the converter is completely poured away or part of the furnace slag is reserved after the slag splashing operation is accomplished.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and specifically provides a method for quickly repairing a large surface of a converter with 100-400mm large-grained dolomite. Background technique [0002] The furnace lining of converter steelmaking is generally made of magnesia-carbon bricks. When adding iron and scrap steel, the impact on the large front surface is relatively large. With the increase of furnace age, deep pits often appear, and the eroded parts of the front large surface need to be maintained. , the traditional maintenance method is to sinter the furnace charge for 40 minutes, the amount of the furnace charge is 1-3 tons, and the cost of steel per ton is about 1-2 yuan. The combustion of the furnace charge has harmful substances to the human body, which is not economical and environmentally friendly; The water-based mixing material is used for large-scale maintenance. Although it is environmentally friendly, the sintering ...

AI Technical Summary

Problems solved by technology

[0002] The furnace lining of converter steelmaking is generally made of magnesia-carbon bricks. When adding iron and scrap steel, the impact on the front large surface is relatively large. With the increase of furnace age, deep pits often appear, and the eroded parts of the front large surface need to be maintained. , the traditional maintenance method is to sinter the furnace charge for 40 minutes, the amount of the furnace charge is 1-3 tons, and the cost of a ton of steel is about 1-2 yuan. The combustion of the furnace charge has harmful substances to the human body, which is not economical and environmentally friendly; The water-based mixing material is used for large-scale maintenance. Although it is environmentally friendly, the sintering time is more than 20 minutes. Due to the water content, the furnace lining tends to be pulverized after long-term use. At the same time, due to the high price, the cost per ton of steel is high. , about 3 yuan per ton of steel

Images