The rotary dryer is a type of industrial dryer employed to reduce or minimize the liquid moisture content of the material it is handling by bringing it into direct contact with a heated gas. This machines adopts low-speed rotation, curved plate hammering, dispersing raw material, make the high temperature air flow mixed with raw material to achieve the drying purpose. It is mainly applied to drying process of all kinds of powder material. It can be widely used in the fuel factory, fertilizer factory, chemical factory, medicine factory and so on.