The cement rotary kiln in cement clinker calcination, also calcined clay, limestone and slag drying; refractory materials in the production of raw materials by calcination rotary kiln, increase its dimensional stability, strength, and processing. Non ferrous and ferrous metallurgy, iron, aluminum, copper, zinc, tin, nickel, tungsten, chromium, burrs and other metal rotary kiln smelting equipment for ore, concentrate, intermediate for sintering and roasting. Such as: aluminum production with its aluminum hydroxide roasting into alumina; use it for the production of iron ore pellets in blast furnace; its extraction of lead and tin by chloridizing roasting method. In the process of ore dressing, the weak magnetic properties of the ore were changed to strong magnetic properties by using the rotary kiln for roasting the poor iron ore. In the chemical industry, with the production of soda calcination rotary kiln, phosphate, barium sulfide etc.. The method has the advantages of low energy consumption, low electricity consumption, no use of sulfuric acid and the utilization of middle and low grade phosphate rock. In addition, the use of cement rotary kiln incineration of hazardous waste, garbage, which not only makes waste reduction, harmless, and the use of waste as fuel, saving coal, so that the waste of resources.