Rotary kiln is the kind of equipment which used in calcining  various materials.It has simple structure, convenient and reliable control during the production process, a few wearing parts, high operation ratio.Rotary kiln is mainly used for metallurgy, building materials, ores and other mineral materials, heating and calcining. Such as ceramic sand, bauxite, limestone, cement, fly ash magnesium aluminum hydroxide, aluminum products, alumina refractory materials such as mineral particles and the heating and calcined powder.