A cement mill is the equipment used to grind the hard, nodular clinker from the cement kiln into , Heat generated in the grinding process causes gypsum (CaSO42H2O) to lose water, forming bassanite (CaSO402-07H2O) or γ-anhydrite (CaSO4 , Roll-presses below) to crush the clinker prior to fine-grinding in a ball mill.
A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust , the material is crushed due to squeezing and grinding inside the crushing chamber , limestone, phosphate, gypsum, weathered shales, however improvements in metallurgy has changed the application of these machin.