Dry Classification Equipment

Dry classification equipment uses a gas stream to convey the solids. The gas used most oflen is air, and for that reason the term air classifiers is often used to describe this type of equipment (see Fig. 4.10). Air classifiers evolved from two sources, the original simple expansion chamber and the Mumford and Moodie separator, patented in 1885. 

FIGURE 4.10 Air classification equipment (a) cyclone, (b) expansion chamber, (c) modern complex air classifier, and (d) classifier based on particle inertia. 

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