Abstract: The upsizing development of mining has brought the demand on the upsizing of mine equipment and also the new requirement on grinding equipment. With a large overflow-type ball mill having a drum diameter of 4 000 mm and an effective drum length of 6 700 mm as example, the determination of its power and its site operation are highlighted. It is concluded the ball mill power can be determined in accordance with its size, ball filling ratio and rotation rate, and the method is proven to be feasible in practice.

Key words: Ball mill, Power, Filling rate, Rotation rate