The dry wet material is sent to the hopper by the belt conveyor or the bucket elevator, and then enters the feeding end through the feeding pipeline through the feeding machine of the hopper. 

 

The inclination of the feeding pipeline should be greater than the natural inclination of the material, so that the material can flow into the dryer smoothly. 

 

The dryer cylinder is a rotating cylinder slightly inclined to the horizontal.

 

The material is added from the higher end, the heat carrier enters from the low end, and is in countercurrent contact with the material, and some heat carrier and material flow into the cylinder together. 

 

With the rotation of the cylinder, the material runs to the bottom end by gravity. 

 

During the forward movement of the wet material in the cylinder, the heat is directly or indirectly supplied by the heat carrier, so that the wet material can be dried, and then sent out through a belt conveyor or a spiral classifier at the discharge end.