Rotary dryer is a newly developed dryer, it is suitable for drying raw material with moisture content of 20%-50%, it can reduce moisture from 20%-50% to 8%-12% only one passage or one time. Rotary dryer and ball mill are used in the cement plant together. Dry ball mill is mainly used for grinding ore slag, cement, flyash. Dust collector will be added when run the ball mill and rotary dryer.