Ball mill is the key mining equipment for secondary grinding after crushing.It is mainly used to grind materials in mineral, cement, refractory, chemical,electric power, coal, traffic, light industry etc,and suitable for grinding all kinds of ores and other materials. Ball Mill has dry and wet ways. When wet Ball Mill works, certain water and other liquid will be added into materials to increase flowability of materials, so the capacity is increased. When dry Ball Mill works, capacity is affected because material flowability is reduced, so absorbing wind device is needed on the outlet of Ball Mill, and then negative pressure is formed in the ball mill to increase flowability of material, so the capacity is increased.Furthermore,series of high-efficiency ball mill adopts rolling bearing support instead of sliding bearing support with bearing bush. Therefore, it can save energy by 10-20%. According to different discharging ways, it can be divided into two kinds, grate type and overflow type.