The Wet process of coal separation is almost the only method universally used in the field of coal preparation. However, water resources are not equally distributed throughout the globe and, as such, more than two- thirds of the coal resources are distributed throughout arid areas. Therefore, it is very important to develop high efficiency dry coal cleaning technology. The dry coal cleaning method with air dense medium fluidized beds, introduces fluidization technology to coal processing, has the advantage of not requiring water, and has a high separation efficiency. The dry coal cleaning method using air dense medium fluidized beds, taking gas-solid two phase suspension as the separation medium, is a gravity separation method^-s. The separation efficiency, such as the probable error Ep value, is as effective and good as that using the wet heavy medium process, which has the best separation efficiency of all wet processes. It is necessary to determine and form a fluidized bed with a specific density. During separation, the original and second fine coal will be produced continuously. Therefore, there are at least two types of solid particles in the separation medium, such as magnetite powder and fine coal. Hence, it is important to study the characteristics and calculate the density of a compound medium solids fluidized bed.
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