When the temperature of the dryer bottom is from 400℃-800℃, the material is feeding from the feeding port of the elevator. Under the effect of gravity, they are uniformly distributed and flowing in the drying machine internal by scattered, crushing, dispersing device  (to ensure the heat exchange effect inside the dryer). Hot gas is generated from the lower hot air furnace. moving from the lower to the upper, it contacts with the materials and then transfer the heat to the materials through heat conduction, convection, radiation and other ways, which makes the material temperature continues to rise, and the water is continuously evaporated. Ultimately, the material  meet the water content requirements will discharge from the lower outlet, and the gas with water vapor will be pumped by the wind turbine.

Rotary dryer has made great breakthrough and innovation on the structure, based on the traditional single tube rotary dryer. From the drying mechanism, the exchange between the material and heat flow is more fully, scientific and reasonable, and the thermal index is in a leading level. It adapts to the drying of clay, gypsum, coal, slag, coal gangue, mixture, dry mixed mortar, sand, iron and other raw materials, also the drying of raw materials in phosphate and compound fertilizer production, the drying of bulk materials in metallurgy, chemical industry powder.