Centrifugal Classifier

These classifiers use centrifugal forces, similar to cyclones, to separate particles at cutpoints between 15 and 100 microns. The feed material is carried into the classifier by the primary inlet flow stream. Internal baffles apply drag forces to the coarse particles while allowing air to pass through them for separation of the fines. The heaviest particles drop to the bottom of the classifier and are discharged through a valve.

Prior to discharge, a secondary air stream enters into the bottom of the classifier and passes through the material. Particles near the cut point in size are returned to the classifier chamber. The air stream carrying the fine particles follows a spiral path to the outlets on each side of the unit.

The two air streams combine and enter a cyclone for final recovery of fine particles. A manual adjustment to the secondary air damper will provide a change in the size of the fines being separated. Because there are no moving parts within the material flow stream, the need for maintenance is minimized.