China's Refractories

Abstract: Currently the service life of CDQ shafts in China is mainly restricted by the properties of the inclined flue bricks. In this work, based on the systematic analysis of the damage mechanism of inclined flue refractories, high performance mullite-SiC bricks were developed. The bricks were produced by corundum, andalusite, SiC and other high purity raw materials. Metal silicon and alumina ultra micropowder were added to form dispersion multi-phase structure, fortifying the matrix and improving the microstructure. The products have excellent properties such as low porosity, high density, good wear resistance, high refractoriness under load, and good thermal shock resistance. The products can replace the ordinary mullite-SiC bricks and obtain a good service life.

Key words: CDQ shaft, inclined flue, new mullite-SiC bricks