Ball Mill is widely used in refractory material, cement, glass factory and some other factories to grind the hard material into fine powder. There are two ways of grinding: the dry process and the wet process. The dry process is to grind the material with water, while the wet process does not allow the water into the material. It is a key equipment for regrinding. It is widely used for the cement, the silicate product, new type building material, fire-proof material, chemical fertilizer, black and non-ferrous metal, glass, ceramics and etc. Ball mill can grind ore or other materials that can be grinded either by wet process or by dry process.