Dry separation of ultrafine materials


  • Simple operation with no moving parts within material flow stream
  • High efficiency separation
  • Uncomplicated, minimal maintenance


  • Adjustability to obtain wide range of required cut points using interchangeable orifices and secondary air adjustments
  • Reasonable power requirements to operate system
  • Abrasion resistant plate or ceramic lining available for highly abrasive applications

Fly ash beneficiation

Metso’s centrifugal classifier has an extensive track record with multiple installations in Australia, Belgium, China, Columbia, India, Indonesia, Korea, United Kingdom and U.S.A.

Typical fly ash tonnages are in the range of 40–100 tons per hour but with capabilities to provide solutions to fit almost any required tonnage. The centrifugal classifier is designed for separations from 635# (20 microns) to 140# (100 microns).

Centrifugal Classifier - How it works

The feed material is carried into the classifier by the primary inlet air flow stream.  Internal baffles apply drag forces to the coarse particles while allowing the 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.


Centrifugal Classifier System specifications
75 Tons/Hour Centrifugal Classifier System (C102-51)
Overall site dimensions 61’ Long x 48’ Tall x 32’ Wide (18.5m x 14.5m x 10m)
Other size systems available ranging from 2 - 500 Tons/Hour

Brochure - Centrifugal classifier for fly ash processing - English Download
Brochure Air Classifiers - English Download
Technical datasheet Air Classification - English Download
Technical datasheet Air Classification Options - Portuguese Download
Technical datasheet Air classification laboratory services - English Download

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