Hydraulic classification in dimensions

While the sedimentation classification described in the previous dossier [J 3 131] separates particles larger than a hundred micrometers, the separation of fine particles (< 100 μm) requires the centrifugal force described in this dossier [J 3 132].

Hydrocyclones are static cylindrical-conical or cylindrical devices into which mineral pulp is injected tangentially under pressure. In this way, the pulp components are centrifuged. Coarse particles move towards the cyclone wall, while fine particles remain in the central zone of the device. Typical particle size ranges from a few hundred to a few tens of micrometers.

Centrifuges consist of a rotor rotating at high speed, into which the pulp is injected. The coarser particles move towards the rotor wall, while the finer particles remain in the central zone. Typical particle size ranges from a few dozen to a few micrometers.

For symbols and notations, please refer to the table at the beginning of the [J 3 131] file.