Rotary kiln refers to rotary calcining kiln (commonly known as rotary kiln), which belongs to building materials equipment. Rotary kiln can be divided into cement kiln, metallurgical chemical kiln and lime kiln according to different processing materials.

　　The cement kiln is mainly used for calcining cement clinker, and it is divided into two types: cement kiln and wet kiln. The metallurgical chemical kiln is mainly used for the magnetization roasting of iron ore in the iron and steel industry in the metallurgical industry; the oxidizing roasting of chromium and ilmenite; the roasting of high alumina bauxite in the refractory plant and the baking clinker of aluminum plant, aluminum hydroxide; the roasting of chrome ore in the chemical plant And minerals such as chrome ore. Lime kiln (ie active lime kiln) is used to roast the active lime and light burnt dolomite used in steel plants, ferroalloy plants.