4. Selector types

Pneumatic classification of particles dispersed in a gaseous medium enables fine (1 to 100 μm) and sometimes relatively coarse (250 μm or more) cuts, with solid throughputs ranging from a few grams in the laboratory to several hundred tonnes per hour in industry. These techniques are designed to process materials characterized by large granular dispersions . There are two main types of industrial selector:

• static selection chambers using a horizontal or vertical gas flow with or without baffles;

• devices using centrifugal force, such as static cyclones, horizontal-axis rotor separators...