... , give a very close product size distribution, and if the ore is not too abrasive, they do not ... a theoretical maximum reduction ratio of 4:1. If a 2 inch particle is fed to the roll ... user of roll crushers, currently, though. Coal plants will use roll crushers, either single roll or double roll, ... crushers, reducing the ROM coal. Usually, these crushers will have teeth or raised forms on the face of ...