Rotary Kiln
Rotary Kilns for Minerals Processing, and Recycling.
A rotary kiln is used to heat solid materials in the form of a powder, or other granular form. Rotary kilns are used for any number of purposes. By far the most common materials processed within a rotary kiln are cement, lime, and iron ore.
For these most common rotary kiln materials, high temperatures in the range of 1100°C.
Most rotary kilns are direct fired – into the kiln from the discharge end. As the kiln rotates, the heated material climbs the kiln wall before slumping down and turning over. With each revolution, the material travels a short distance along the length of the kiln because it is at a slight angle.
This slight tilt allows the material to enter one end of the kiln and to exit the other end.
This heating technique is most appropriate for powdered or granular materials and this constant tumbling of the material allows the heat to reach each particle without relying on conduction.
