The rotary dryer is mainly composed of rotating body, baffle plate, transmission device, support device and other components. Its working principle: By using a lifting plate that is evenly distributed in the cylinder with reasonable manipulation and alternating angles, the water containing material is thrown into the rotating cylinder, and the water is secreted from the material by the hot air flow, turning into water vapor and discharged into the atmosphere for drying. Rotary dryers are used for drying materials such as slag, clay, limestone, etc., mainly in industries such as cement, chemical, metallurgical, and building materials. It has the advantages of high drying capacity, balanced operation, low energy consumption, easy operation, and high output.