Calcined alumina and alumina into ordinary industrial alumina, calcined alumina is an essential raw material production of antique tiles, and can be used in the production of industrial alumina ceramic stone, in the traditional glaze, the alumina used as whitening. Alumina, calcined alumina rotary kiln is designed to a device, and he can be divided into dry and wet calcined calcined. Alumina extraction process roughly broken - Wet - Dissolution - Dilution - sedimentation separation of red mud - red mud washing - seeded precipitation - calcination - Evaporation - causticization these steps. Wherein the alumina is in the high temperature rotary kiln down AL (OH) 3 is attached to the water, to remove crystal water, in order to obtain alumina qualified. The beginning of the alumina generally contains 10% - 15% of the attached water, when it is heated to a temperature of 100-110 degrees Celsius will be evaporated, and the crystal water in the bar attached to the surface water after drying, the air the heating temperature of the alumina can reach 250-500 degrees Celsius, can be removed one after another three molecules of crystal water to produce y-AL2O3, this crystalline material generated when the performance is not perfect, can not meet the requirements of aluminum , need to continue to elevated temperatures, the temperature was elevated to 1100 degrees Celsius, the y-AL2O3 gradually transformed into a-AL2O3. China is the world's largest number of countries using the rotary kiln, and with the non-ferrous metallurgical industry and building materials industry to flourish, more and more demand for the rotary kiln, the specification also expanded. In addition, the rotary kiln is also used in the environmental industry, the garbage, rubber products, such as processing, so the use of rotary kiln has great value and potential. Please indicate Henan YuFeng Heavy Machinery (http://www.yufchina.com)