|Applications||quantification of grindability of ores and minerals|
|Field of application||construction materials, environment / recycling, geology / metallurgy|
|Feed material||hard, brittle|
|Size reduction principle||friction|
|Material feed size*|
|Batch size / feed quantity*||min. 15 kg with ball module / min. 20 kg with rod module|
|Rotation speed||70 min-1 with ball module / 46 min-1 with rod module|
|No. of grinding stations||1|
|Material of grinding tools||hardened steel|
|Grinding jar sizes||21.7 l with ball module / 43.3 l with rod module|
|Setting of grinding time||digital|
|Drive power||0.75 kW|
|Electrical supply data||different voltages|
|Protection code||IP 50|
|W x H x D closed||1500 x 1200 x 700 mm|
|Net weight||~ 295 kg|
The ball and the rod mill basically have the same concept comprising either a 12x12’’ jar with grinding balls or a 12x24’’ jar with grinding rods.
The jar is attached to a rotating yoke which is driven by a motor and can be placed in three different positions: Upwards for loading, horizontal for grinding, downwards for discharging.
To carry out the Bond Index test the pre-defined number of grinding balls or grinding rods is required. The electronic control integrated in the drive is equipped with an overload protection and permits and controls different speeds.
During the grinding process the difference in speeds between the balls / rods and grinding jar produces an interaction between frictional and impact forces, which releases the required comminution energy. The interplay between these forces produces a very effective degree of size reduction.