As shown in the figure, the rotary dryer is the main auxiliary equipment with dryer combustion chamber, feeding and unloading equipment, dust collector and the exhaust fan.

Wet material is sent to the feeding end forging by the belt conveyor 2, and then entered into the dryer through the feeding chute 5. The revolving speed of the rotary dryer is generally 2r/min ~ 5r/min while the slope is 3% ~ 6%. When rotating in the cylinder body, the Material is moved from high-end to low-end, discharged from flap valve, and then transported by the conveyor. The hot gas enters into the dryer cylinder through the combustion chamber 3, and makes the heat exchange with the material, thus it makes the material strongly dehydrated and the gas temperature dropped. The waste gas is discharged into the air by exhaust fan through chimney 8, passing by the discharge hood, dust collector 6.