Rotary kiln is also referred to rotate calcination kiln, belongs to construction material equipment. Rotary kiln can be pided into cement kiln, metallurgy chemical kiln and lime kiln according to different materials. Cement kiln is used for making of cement clinker and there are dry and wet methods to make cement. Metallurgy chemical kiln is used in metallurgy industry and ironworks for lean iron ore, chromium ore and ferronickel ore calcinations, which is used for calcining of high aluminum vandal ochre in refractory material industry; for calcining of calotte and aluminum hydroxide in aluminum manufacturer; for calcining of chrome sand ore and chrome powder ore in chemical plant. Lime kiln are used for calcine dolomite and active lime which is used in steel plant and ferroalloy factory.

Rotary kiln is a processing device, which is mainly used to raise materials to a high temperature in a continuous process, as the common saying – calcinations. It is usually used with the material as follows: cement, lime, refractories, metakaolin, titanium dioxide, alumina, vermiculite, iron ore pellets, etc. According to different material, the rotary kiln can be divided into three types, cement kiln, metallurgy kiln and limestone kiln. The cement kiln is mainly used for calcimine of cement clinker; usually, it has two types — wet and dry. The metallurgy kiln is used in metallurgy industry and ironworks, such as lean iron ore, chromium ore and ferronickel ore calcimine. The lime kiln, also named active lime kiln, is used for roasting the active lime which is used in steel works and ferroalloy works, and calcined dolomite.

The purpose of the refractory lining is to insulate the steel shell from the high temperatures inside the kiln, and to protect it from the corrosive properties of the process material. It may consist of refractory bricks or cast refractory concrete, or may be absent in zones of the kiln that are below around 250°C. The refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed. In some processes, such as cement, the refractory life is prolonged by maintaining a coating of the processed material on the refractory surface. The thickness of the lining is generally in the range 80 to 300 mm. A typical refractory will be capable of maintaining a temperature drop of 1000°C or more between its hot and cold faces. The shell temperature needs to be maintained below around 350°C in order to protect the steel from damage, and continuous infrared scanners are used to give early warning of ‘hot-spots’ indicative of refractory failure.

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