centrifugal separator / gas / for the food industry / classifier
Centrifugal Air Classifier



  • Technology:


  • Separated substance:


  • Application domain:

    for the food industry

  • Other characteristics:


  • Width:

    10 m (32'09")

  • Filtration size:

    Min.: 15 µm

    Max.: 100 µm


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 locations all over the world. 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).

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.

Applicable industries:
Industrial minerals

Dry, ultrafine separation for industrial applications
Fly ash beneficiation for concrete additive