Ball mill Metso minerals

Ball mills are used primary for single stage fine grinding, regrinding, and as the second stage in two stage grinding circuits
Grinding of materials in a tumbling mill with the presence of metallic balls or other media dates back to the late 1800's. Since that time, Metso
Minerals and its predecessor companies, MPSI, Sala, Marcy, Hardinge, Kennedy Van Saun (KVS), Denver Equipment, Allis Chalmers, Boliden
Allis, and Dominion Engineering, have designed and manufactured more than 8,000 grinding mills.

Metso overflow ball mill sizes range from 5 ft. x 8 ft. with 75 HP to 26 ft. x 41 ft. with 20,000 HP.

Normal feed size to a Metso Minerals ball mill is 80% passing 1/4" (6mm or finer) for hard ores and 80% passing 1" (25mm or finer) for soft ores.
Product size is typically 35 mesh or finer.

Operation

Ball mills operate either in open or closed circuit. Open circuit operation is best utilized when:
Another stage of grinding follows the mill
Reduction ratio is small
Feed material is already fine and one pass through the mill produces the desired results
Product size control is not critical and oversize material can be tolerated in the product

More specifications...