Rotary furnace is a kind of thermal equipment for calcining, roasting or drying granular and powdery materials.

Rotary furnace as a conventional kiln has existed for hundreds of years, but it is large or super large, mainly used in the primary rough processing of powder or mineral materials, such as the sintering and calcination of cement clinker, the preparation of titanium dioxide from kaolin, the processing of rare earth industry, etc. Although the output is large, there are some disadvantages, such as large temperature difference, low temperature control accuracy, unable to seal and achieve accurate atmosphere control.