Cement Grinding - 911 MetallurgistMar 17, 2017 . The principle of Grate Discharge grinding is nearly universally adapted in the cement grinding industry. Grate Discharge Ball Mills are the rule rather than the exception. Rod Mills for raw and finish grinding begin to enter the picture. Larger and larger diameter mills become common. Lengths tend to shorten.grinders for cement industry,FL - GrindingRead about all the different types of grinding mills that FL offers. . OK™ Cement Mill. Designed for energy-efficient grinding of all cement types. ATOX_raw_mill_ . UMS™ Unidan Ball Mill. Designed for grinding of clinker and gypsum to any type of cement. FL Roller Breaker.