Investigation on Application Performances of Chrome-Free MgO-Al2O3-ZrO2 Bricks for Sintering Zone in Cement Kiln

Four groups of specimens were made from Magnesia and alumina-zirconia synthetic materials, the content of alumina-zirconia synthetic materials was 5%, 10%, 15% and 20% respectively. While one group of reference specimen was made from magnesia and magnesia-alumina spinel at the same conditions for comparing. The Ligno-sulfite was used as binder. The raw materials were mixed homogeneously and then were molded to 5 groups of specimens. After being dried at the temperature 100°C holding 24 hours, the bricks were sintered at the temperature 1530°C 10h, and then the physical performances of the specimens were tested. Phase composition and microstructure of the specimens were also analyzed. The result shows that the performances of the MgO- Al2O3-ZrO2 specimens are better than that of MgO-Al2O3 specimen. The specimen which contains 10% alumina-zirconia synthetic materials has the best comprehensive performance. The thermal shock resistance and erosion resistance of the MgO-Al2O3-ZrO2 specimens are better than the MgO-Al2O3 specimen. It proves that MgO-Al2O3-ZrO2 bricks are potential good material for sintering zone.