The hydraulic classification

Hydraulic classification consists of separating solid particles suspended in a liquid (pulp) into two distinct particle size fractions – fine (or overflow) and coarse (or underflow). The principle of separation is based on the effective size of the particles by difference in sedimentation velocity in a liquid. This type of classification is made for particle sizes of between 15 and 800 µm.

There are two types of hydraulic classification equipment: gravitational or simple sedimentation classifiers (settlers, spiral classifiers, etc.) and centrifuge classifiers such as hydrocyclones and centrifuges.

CTP has hydraulic separation equipment operating at laboratory scale and pilot scale:


Theoretical cut

Capacity (m³/h)

Hydrocyclone separation banks

2-25 µm


Hydrocyclone separation skid

15 µm


Screw classifiers

63 µm


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