The pneumatic classification

Pneumatic classification relies on classification of powdered, dry material suspended in a moving gas (generally air) to obtain two distinct fractions – fine and coarse. The principle of separation is based on the effective size (and not actual physical size) of the particles by difference in dropping velocity in a gas. This type of classification is made for particle sizes of between 1 and 100 µm.

There are two types of pneumatic classification equipment: static classifiers with horizontal or vertical gas current and centrifugal selectors such as cyclones and dynamic separators.

CTP has pneumatic separation equipment operating at laboratory scale and pilot scale.

Equipment	Theoretical cut	Max. capacity⁽¹⁾
Pilot dynamic air classifier	3 to 110 µm	1 t/h
Lab Z classifier	2-25 µm	5 kg/h
Pilot static air classifier	100 µm to 1 mm	200 kg/h

^{(1) Depending on the cut and the material}