Cement kiln is used for making cement clinker and there are dry and wet methods to make cement. Metallurgy chemical kiln is used in metallurgy industry and ironworks to calcimine lean iron ore, chromium ore and ferronickel ore calcimine. Rotary kiln is used to calcimine high aluminum vandal ochre in refractory material industry; to calcimine of calotte and aluminum hydroxide in aluminum manufacturer;to claimine chrome sand ore and chrome powder ore in chemical plant. Lime kiln is used for baking active lime and dolomite in the steel factory and ferroalloy factory.

Among many production industries such as building material, metallurgy, chemical industry environmental protection, the widely used turning circle equipment which process solid material with mechanical, physical or chemical is called rotary kiln.

According to the exterior, rotary kiln can be pined into altered diameter rotary kiln and drift diameter rotary kiln; according to the usage, it can be pied into Cement rotary kiln , clay-grain rotary kiln, kaoline rotary kiln, lime rotary kiln; according to energy supply, it can be pided into gas rotary kiln, Coal-fired rotary kiln and Mixed fuel rotary kiln.

For Environment Protection, it has a history for 20 years that the developed countries use cement kiln to calcine hazardous wastes and rubbish. This method can not only make the waste become less and harmless, but also can make waste as the fuel, which can save coal powder and realize the Recycling of waste.