There are two primary objectives in crushing coal. Namely to reduce the size of ROM to a size suitable for washing or to produce a coal that meets market requirements in terms of size.

Portaclone has the answer wherever crushing is required. Rotary breakers being preferred for crushing ROM where a large percentage of stone is present. Double roll crushers in a closed circuit, with or without hand picking, would be suitable where the percentage of stone is not high, or where the stone is relatively soft.

Either double roll or rolling ring type crushers would be suitable for crushing a product, the final choice being dependant upon factors such as fines generation.