Gangue crusher adopt double rotor up and down two-stage crushing, no screen and grate bottom, the moisture content of the material is not strictly required.There is no problems such as paste blocking sieve, more powder can not be discharged, repeat crushed. Therefore, it has high grinding efficiency and there is no hammer invalid wear and tear. ohio ball mill processing coal gangue. Milling Equipment - ohio ball mill processing coal gangue - A class of machinery and equipment that can be used to meet the production requirements of coarse grinding, fine grinding and super fine grinding in the field of industrial grinding. The finished product can be controlled freely from 0 to 3000 mesh.