Manual Mining. The single crusher, when of the gyratory type, might be any size from the No. 2 (6″ opening) to the No. 6 with 12in. opening. When demand grew beyond the capabilities of one crusher, it was generally a simple matter to add a second machine .
May 15, 2014· Cleaning the coal through the washery reject crusher and removing the ask particles is necessary before putting the coal in the market for sale and for any kind of use. What kind of a crusher one would need for separating the ash from coal depends on the type or say, the quality of the coal.