Cement kilns are factories that produce cement through the heating of raw materials and minerals. Synonyms for cement kilns include clinker kiln, rotary kiln, and lime kiln. Clinker kilns refer to kilns that produce clinker, which is a nodular material used in the production of cement. Rotary kiln is a type of cement kiln that rotates on its axis, using heated air to drive chemical reactions. Lime kilns are used for the production of lime, a basic material used in construction and other industries. Other synonyms for cement kilns include calciners, furnaces, and ovens, all of which refer to the industrial equipment used in the production of cement.