According to the handling the different materials the rotary kiln can be divided into cement rotary kiln, metallurgical rotary kiln, and lime kiln. The cement rotary kiln is mainly used for calcining the cement clinker. Meanwhile it also has dry process production and wet process production. The kiln structure is simple, and the control is strong, and the raw meal composition is even. the process is stable, the clinker out from the rotary kiln is high quality, and the clinker strength is highest, During the grinding process the dust is little. and the fly dust is little at the kiln rear.