Study on application of SiC-C compound in taphole clay of blast fumace

SiC-C compound was prepared using partial pyrolytic carbon source and silicate. The chemical composition, phase composition and microstructure of the material were analyzed. The taphole clay specimens of the blast furnace were prepared using SiC-C compound to partially or wholly replace SiC and coke powder. Effects of SiC-C compound addition on strength, oxidation resistance and corrosion resistance of taphole clay were investigated. The results show that: The main phases of SiC-C compound are α-SiC, graphite and SiO 2; With SiC-C compound addition increasing from 10% to 35% (mass percent) , the performance of taphole improves; when the SiC-C compound addition is between 20%-30% (mass percent), the blast furnace taphole has good physical and application properties,and excellent cost performance. This new kind of taphole clay has been applied successfully in various domestic blast furnaces.