Method for repairing converter by using waste magnesia carbon bricks

Abstract

The invention relates to a method for repairing a converter through waste magnesia carbon bricks. The method comprises the following steps that the to-be-repaired converter is tapped; terminal slag after tapping is directly poured without slag splashing until to-be-used brick fillers are covered with the terminal slag; a pre-calculated amount of brick fillers are added into the to-be-repaired converter, and forms a molten material together with the terminal slag; according to the converter repairing position, the converter is shaken, and thus the molten material can cover the to-be-repaired position; the to-be-repaired converter is sintered for 30 minutes or longer until the terminal slag is solidified; and iron is fed, and next batch of smelting is conducted. According to the method for repairing the converter, the problems of long sintering time, poor converter repairing effect, high converter repairing cost, serious environmental pollution and the like can be effectively solved, byreasonably controlling converter terminal slag, the effect that a mixture of the converter terminal slag remaining in the converter and the waste magnesia carbon bricks is effectively bonded to the repairing position of a converter lining is achieved, and finally the broken converter is repaired.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for repairing a converter by using discarded magnesia-carbon bricks. Background technique [0002] The iron and steel industry is a large consumer of refractory materials. According to statistics, the annual consumption of refractory materials in iron and steel enterprises across the country is about 10 million tons, and the used refractory materials are more than 5 million tons. This not only leads to the waste of resources, but also brings environmental pollution. If the used refractory materials are recycled, not only high-quality unshaped refractory materials can be produced, but also high-quality shaped products and other materials can be regenerated. This not only saves the country's mineral resources and energy, but also reduces environmental pollution, and greatly reduces the cost of refractory materials and steelmaking costs. [0003] At present, the repai...

AI Technical Summary

Problems solved by technology

However, the use of slag splashing to protect the furnace will cause the temperature of the molten pool to drop rapidly, and the slag with high viscosity will cause the bottom of the furnace to rise, which will affect the smelting effect. After slag splashing, the oxygen in the molten steel will rise and the quality of the molten steel will deteriorate.

The disadvantages of wet gunning include: the wall of the red-hot carbonization chamber will be impacted by rapid cooling, the surface structure of the silica brick will be damaged, and the life of the furnace body will be shortened; the water content of the repair material will increase, and the pores of the mud material will increase. , and the part in contact with the furnace wall will be violently vaporized, making the texture of the mud loose, reducing the strength of the repair layer, easy to wear and fall off; it will make the adhesion between the normal temperature repair material and the red-hot masonry weak , the loading time is shorter

This method requires additional equipment