The apparatus used to manufacture cement from cement clinker is
Rotary Kiln
Rotary kiln is used to manufacture cement in large scale from cement clinker. Cement clinker is obtained when limestone and clay are heated in a rotary kiln. It is then mixed with gypsum and then powdered and stirred to get cement.
Cement refinery does not exist. Steam boiler and heating furnace are used in other industrial setups, but not in the manufacturing of cement.