Method for repairing converter through abandoned magnesia carbon bricks

Abstract

The invention discloses a method for repairing a converter through abandoned magnesia carbon bricks. The method comprises the following steps that 1-2 t abandoned magnesia carbon bricks are put into asteel scrap bucket; after tapping, slag is poured into a tapping opening on the rear portion of the converter, a defined amount of slag is left, and a converter body is moved to the position slightlylowered than the steel scrap bucket; the abandoned magnesia carbon bricks in the steel scrap bucket are poured into the converter body, and during brick pouring, the converter body ascends so that the abandoned magnesia carbon bricks in the converter can be flattened; the converter is moved to the position needing to be repaired, residual slag is poured out, little slag is left in the converter to the greatest extent as long as the surface layers of the abandoned magnesia carbon bricks can be covered; after still standing, the abandoned magnesia carbon bricks can deposit in the repaired position through gravity, the abandoned magnesia carbon bricks chemically react with the slag in the sintering process, high-melting-point mineral substances are generated on the surface of a converter lining, steel scrap is added, thus, the slag quickly condenses, and converter repairing is completed. According to the method, converter repairing is finished through the abandoned magnesia carbon bricksduring casting within the rich rhythm time, the sintering time is substantially shortened, quick converter repairing can be achieved, the large-area maintaining time is long, and the converter production efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of converter protection, in particular to a method for repairing a furnace by utilizing waste magnesia-carbon bricks. Background technique [0002] In the process of converter steelmaking, the chemical corrosion of slag, the impact of molten iron and scrap steel, and the sharp change of furnace temperature during tapping and charging will cause serious damage to the converter lining. In addition, the large surface of the converter is the weak link of the entire furnace operation. It is most severely scoured by molten iron and scrap steel and mechanically worn, making maintenance difficult. It is necessary to optimize the way of repairing the furnace to reduce the damage to the converter lining. [0003] At present, the main methods of repairing the converter are to use large fabrics to subsidize and pig iron to repair the furnace. These two repair methods have the following disadvantages: 1. Using large fabr...

AI Technical Summary

Problems solved by technology

[0003] At present, the main methods of repairing the converter are to use large fabrics to subsidize and pig iron to repair the furnace. These two repair methods have the following disadvantages: 1. Using large fabrics to subsidize and sinter at high temperature, the sintering time is long, and the average 1 ton of material needs 70 It takes minutes to burn through, resulting in low productivity of the converter, and the repair material is not resistant to erosion, and it is easy to fall after being mechanically impacted and chemically attacked by molten iron and scrap steel, and the maintenance duration is short