Dry separation of fine materials


  • Simple operation with no moving parts within material flow stream
  • Suitable for arid and arctic applications
  • Uncomplicated, minimal maintenance


  • Ease in adjustability to obtain required cut point
  • Reduce loading or eliminate settling ponds
  • Diminish natural sand dependence & offer long term sand production solutions
  • Reasonable power requirements to operate system
  • Abrasion resistant plate or ceramic lining available for highly abrasive applications
  • Stationary and transportable systems available

Gravitational Inertial Classifier - how it works

The feed material and primary air enter the top of the unit and travel downward. The air makes a 120 change in direction.  It then exits through the vanes carrying fine particles with it. The coarse particles that are too heavy to make the turn fall to the bottom of the unit where they pass through the secondary air before they are discharged through a valve. Secondary air, entering below the vanes, passes through the curtain of falling particles. Those particles that are near the cut point in size are diverted by the secondary air stream into an eddy current within the heart-shaped chamber. Some fines are captured as they enter the unit while others are drawn from the eddy current. These particles are carried by the exiting air to a fabric filter for final recovery.

Technical specifications
60 Tons/Hour Gravitational Inertial Classifier System (AC30GI):
Overall site dimensions 51’ Long x 42 Tall x 25’ Wide (15.5m x 13m x 8m)
Other size sytems available ranging from 2 - 500 Tons/Hour

Air Classifiers - Accurate fines control for engineered sands - 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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