Maintenance method of converter lining

Abstract

The invention provides a maintenance method of a converter lining. According to the maintenance method of the converter lining, slag repair is conducted on a damaged lining through iron blocks with the carbon content being 3.5%-4.5%, and carbon in the iron blocks and slag perform a deoxidation reaction, so that the oxygen content of the slag is reduced; additionally, the iron blocks have the heat absorption function, so that the low-oxidizability high-refractoriness slag is made to rapidly adhere to the peripheries of the iron blocks; a generated splashed slag layer and a combination face of a foundational lining perform a metallurgical reaction, and the connection between the splashed slag layer and the combination face of the foundational lining is metallurgical bonding connection, so that the bonding force is larger, combination is tighter, an obvious layered phenomenon is avoided, and the fettling effect is improved; iron block fettling is conducted 1-2 times per shift, the deslagging face of a converter is basically not fettled with a fettling material any more so that the consumption of the fettling material can be reduced by 50% or above, the converter shutdown time of per shift is shortened by about 40 min, and the production stability is greatly improved; and after slag splashing of the iron blocks, the splashed slag layer can be kept for five batches or above, and the maintenance effect is even better than that of fettling adopting the fettling materials.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for maintaining the lining of a converter. Background technique [0002] Since the converter slag splashing protection technology was widely used, the furnace life of the converter has been greatly increased, reaching an average of more than 13,000 furnaces. However, the erosion of the furnace lining is uneven, especially the slag pouring surface, which is not only affected by the chemical erosion of molten steel, slag, and furnace gas, and the impact of rapid cooling and heating of the furnace lining, resulting in refractory bricks peeling off, but also by the erosion of molten iron when mixing molten iron and mechanical impact when adding scrap steel. , is the key maintenance part of the furnace lining. [0003] In order to ensure the safe operation of the furnace lining, it is generally adopted to increase the frequency of furnace repairing on the slag ...

AI Technical Summary

Problems solved by technology

In order to reduce the production cost, the method of repairing the furnace with pig iron blocks was adopted in the follow-up, which reduced the consumption of repairing materials. However, when repairing the furnace with pig iron blocks, there was a phenomenon of delamination between the repairing layer and the basic lining, and the connection was not firm. That is, a lot of peeling off, the actual effect is not ideal