Abstract
Thorough mixing of particles in the transverse plane of a rotary kiln is fundamental to the uniform heating or cooling of the charge and, ultimately, to the generation of a homogeneous product. However, differences in particle size and density result in a demixing process whereby smaller or denser particles segregate to form an inner core or kidney of segregated material which may never reach the bed surface to be exposed to freeboard temperatures. In this chapter, an analytical model and its numerical solution which relates particle segregation rates to primary operating parameters such as rotary kiln diameter, bed depth, and rotational speed are presented.
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