A rotary kiln is a device that uses heat to change the chemical composition of an object. It consists of a reinforced steel shell, support rollers, and internal heat exchangers. It is commonly used in the creation of cement and can break down many types of solids into usable materials.
A rotary kiln is a device that supplies massive amounts of heat to change the chemical composition of an object. Consists of a heavy duty reinforced steel outer shell coated with a heat resistant inner lining, support rollers and drive gear to keep the contents in a continuous rotating motion, and internal heat exchangers capable of producing temperatures well in excess of 2732 degrees Fahrenheit (1500 degrees Celsius). The rotary kilns will be angled slightly so that the internal contents sift down towards the heat source and allow evaporative gases to escape from the top during the process through sealed ducts. The contents are then sorted and ejected through an opening in the lower end of the device which automatically sorts processed materials and waste into separate bins. Other common terms to describe such a device may be a rotary kiln incinerator or rotary kiln dryer.
Perhaps one of the most common uses of this technology is in the creation of a rotary cement kiln, which grinds limestone, clay and shale down to small pieces of rock and turns them into a usable cement mix that is ready to be packaged or immediately used. . During this process, the materials are exposed to varying temperatures which will evaporate any water present and return the limestone and clay to their original oxide states. When internal heat rises to 2642 degrees F (1450 degrees C), the rocks that have been processed into belite and calcium oxide fuse together to form the composition halite. Due to the extreme heat associated with this process, the resulting lumps of halite are no larger than 0.39 inch (10 mm) and can be easily handled once the cooling process is complete.
The rotary kiln design allows many similar types of solids to be broken down into more easily usable materials and is commonly used on alumina, titanium dioxide, and lime. Metakaolin, iron ore pellets and many other metallic and non-metallic components can also be broken down by a rotary kiln. Also created with this method is refractory material, or a solid whose composition does not possess metal, but still remains suitable for construction, and finally installed inside rotary kilns and other kilns as an insulator to protect the outer shells from extreme internal temperatures.
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