Application of corundum and corundum-mullite -Al2O3 ceramic ball and ceramic lining brick: The series products have excellent characteristics of high intensity, high rigidity, high wear resistance, high specific gravity, small size, high temperature resistance and corrosion resistance. They are applicable to various fine crushing equipment as grinding medium and cylinder internal lining. They are better than other grinding media in high wearing efficiency, low wear and no pollution. Therefore they are widely used in glaze, paint, ceramics, enamel, glass, oil refining, dye printing and chemical manufacturing fields.