Spherical stone (alias: silica, silica, silica ball, silica ball filler, ball mill filler, ball mill special spherical stone, wear-resistant ball) is a light cyan (light gray or gray) microcrystalline pyrogenic rock, its cross section dense hardness, the Mohs hardness of the silica stone is more than 7, the silicon content is more than 99%, the iron content is less than 0.32%, due to the high wear resistance and high hardness of silicon ore Characteristics, is the ideal material for ball mill grinding medium, after continuous attempts and research and development made of ball stone and silica liner, ball mill grinding material, has good hardness, good wear resistance, no impurities do not affect the color of grinding raw materials, and aluminum porcelain ball compared with its hardness and wear resistance value.