Ball/pebble mills
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
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.
Ball/pebble mills are suitable for:
- Ball mills for use of metallic media
- Pebble mills for use of ceramic or natural rock media
- Single stage fine grinding
- Regrinding
- Second stage in two stage grinding circuits
Main benefits of ball/pebble mills:
- More than 100 years of experience
- Automatic operation saves power
- Software to suit the most complicated circuits and complex ores
Main features of pebble/ball mills:
- Size range from 5 ft. x 8 ft. with 75 HP to 30 ft. x 41 ft. and as much as 30,000 HP
- Feed size 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/pebble 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
Where size control of the final product is important, closed circuit grinding is the most efficient method ofoperation. The production of a higher quality product at a lower cost justifies the additional capital investment. Common wet grinding flowsheets include:
- Open circuit
- Closed circuit with hydro cyclones
- Closed circuit with vibrating screens
- Two stage variations of the above utilizing two mills in series
Let our engineers review your specifications and recommend the optimum circuit for your application
Application
A ball/pebble mill grinds ores and other materials to a typical product size of 35 mesh or finer.
See also
Ball mills for lime slaking.
Attachments:
Brochure Ball Mills CHI (1993 kB) 
Brochure Ball Mills EN (1292 kB)
Brochure Ball Mills PT (987 kB)
Brochure Ball Mills RU (1178 kB)
Brochure Rubber Roller mills SRR EN (375 kb)
