For the clinkerization process a cement plant has a rotary kiln. Some cement plants make clinker for its own and also for other facilities specialised in the grinding process only. 2Cement Clinker Plant: Makes only clinker and they also has a rotary kiln. Its clinker is grinded in other separated facilities. 3Cement Grinding Mill: Clinker is grinded and gypsum is added to make finished cement. These factories .