Rotary kiln can be divided into metallurgy kiln, chemical engineering kiln, and building material kiln according to its different dealing materials.
The building material kiln is mainly used in claiming clinker cement, limestone and porcelain granule. Metallurgy  rotary kiln is mainly used for themmagnetizing claiming of lean iron ore in iron and steel plant in metallurgy industry, the chromites and Josephine oxidizing claiming, claiming of devaluate and clinker aggregate and aluminum hydroxide roasting in aluminum factory; Chemical engineering rotary kiln is used in chemical plant for chromium ore and chromium ore powder roasting. The limestone kiln (activity limestone kiln) is used for claiming activity lime and dolomite in iron and steel plant and ferroalloy works.

Rotary kiln is the equipment which is widely used for dealing with solid material mechanically, physically and chemically in building material, metallurgy, chemical, engineering and environment protection industries