Hot patching material for large face of converter

Abstract

The invention relates to a hot patching material for a large face of a converter. The technical scheme is that: a uniform and loose aggregate is prepared by mixing and stirring 80 to 85 weight percent of magnesite or forsterite serving as a main raw material, 10 to 15 weight percent of lactose or maltose serving as a binder, 0 to 5 weight percent of graphite serving as a carburant, and 0 to 5 weight percent of silica powder, ferrosilicon powder, aluminum powder and the like serving as combustion improvers. The hot patching material is mainly applied to patching the large face part of the converter, and has the characteristics of short sintering time, no toxic gas emission, high adhesive force with a converter body, long service life and the like.

Description

Technical field: [0001] The invention belongs to the technical field of unshaped refractory materials. In particular, it relates to the preparation of a large surface hot repair material for a converter. technical background: [0002] The converter is the main equipment for the steelmaking production of the converter. Due to the long-term mechanical impact and slag erosion of the converter at high temperature, the refractory materials on the bottom of the furnace and the large front and rear surfaces are easily damaged. In order to increase the life of the converter and reduce the cost of steelmaking, the lining of the converter is usually maintained. The current maintenance method is to protect the furnace by slag splashing on the converter and carry out large-scale hot repair at the same time. Converter slag splashing is to add a modifier after the steel is tapped to make the slag and modifier adhere to the inner wall of the converter by blowing nitrogen and splashing th...

AI Technical Summary

Problems solved by technology

[0003] According to the analysis of the above situation, there are currently two main types of converter large surface repair materials classified according to the binder: one is a hot repair material with asphalt or resin as the binder, which has a long service life, but produces a large amount of harmful smoke and dust at high temperatures , the sintering time is long, which affects the production efficiency of the converter; one type is a water-based repairing material with metasilicate or phosphate or inorganic substances as the binder. The generation of low melting material or the large amount of evaporation of water vapor makes the structure loose and the strength is very small, which makes the service life shorter, so the repair is too frequent, which affects the production efficiency of the converter