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Rotary kiln technology is a thermal process for calcination, sintering, pyrolysing and burningof powders and granulates. A rotary kiln plant consists of a tube rotating on its own axis, material feed and discharge housing as well as necessary supplementary elements (dosing device, pre-heater, afterburner, etc.). Depending on the type of firing, a distinction is made between directly and indirectly heated rotary kilns.
In directly heated kilns an open flame burns in the rotating tube. The material is heated directly in a hot gas stream that flows through the interior of the rotating tube. Thus especially high throughput rates and temperatures can be attained.
With an indirectly heated rotary kiln, the heat is introduced indirectly, i.e. from outside of the reaction chamber, either using an electrical heat source or a hot-gas burner. Thus the material can be treated using a defined gas atmosphere (e.g. inert or reducing). Since very low gas volume streams can be attained in an indirect rotary kiln, it is possible to treat very fine powders. Moreover the indirect way of heating enables simplified cleaning and avoids cross contaminations.
The treatment temperatures of IBU-tec rotary kilns range up to 1,550°C.