Its principle of operation: the material retaining plate which is arranged reasonably with changeable angles in order, throws moisture materials into the rotary cylinder. Then water will be separated from the materials by hot air-flow and changed into vapour to be discharged into the atmosphere. Then the materials would be dried. Rotary dryer is used to dry slag, clay, limestone, etc. It is mainly used for cement, chemical, metallurgical, building materials industries. Its advantages are as follows: high drying capacity, smooth rotation, low energy consumption, easy operation, high output and so on. According to your needs.