Rotary kiln is a sintering kiln for alumina clinker. When producing alumina, bauxite is first mixed with soda ash and lime in proportion and loaded into a rotary kiln. After being calcined at 1200-1300 degree , it is discharged from the kiln and then processed appropriately to produce aluminum hydroxide and mother liquor; Aluminum hydroxide can be loaded into a rotary kiln and calcined at a high temperature of 1200 degree to make it. The calcination process in a rotary kiln involves the reverse movement of high-temperature flames and heated materials in the furnace. Alkali lime alumina raw material slurry (with a water content of 40%) or aluminum hydroxide (with a water content of 12% -18%) is added to the kiln tail, and is dried and dehydrated at low temperature, heated, and calcined at high temperature before being discharged from the kiln head. High temperature gas flows from the kiln head to the kiln tail. Therefore, the kiln is divided into pre heating zone and high-temperature calcination zone. In order to prevent the slurry from sticking to the kiln lining and enhancing heat transfer during the heating and calcination process, there is no chain installed between the refractory material masonry. During the rotary motion of the kiln body, the material and lining bricks are continuously hit, which has a certain impact on the service life of the kiln lining.

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