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The term calcination originally meant the deacidification of limestone. Today a variety of thermal processes are called calcinising, calcination, and calcinating. In the calcination process we heat your materials in our rotary kilns to dehydrate, colour, decompose or otherwise chemically treat them. This plays an important role especially in the manufacture of gypsum, cement, aluminium oxide or petroleum coke as well as firing clay and the removal of crystalline water from hydrated salts. The term calcination is often used in the manufacture of specialty chemicals such as catalysts, too.
Firing materials involves inducing a chemical reaction or alteration of the respective material’s crystalline structure through the application of heat. Thus this process in the rotary kiln is used to modify the material’s properties, as a separating process to extract materials or to support the shaping of materials.
Sintering is a process for manufacturing or transforming materials. Here fine grain materials are heated in the rotary kiln at high temperatures below the melting point of their main components so that the material form is retained. The sintering process turns a moulded fine or coarse-grained green body into a hard work piece. It is the temperature treatment from which it attains its final properties such as strength, hardness or density.
The pyrolysis of materials aims to separate organic compounds by means of thermal-chemical process. The material treatment in our rotary kilns, at temperatures up to 1,000°C induces decomposition within large organic molecules. This process—in contrast to combustion or carburation—is only possible by applying heat without additional oxygen.