Fine particle separation below 75 microns with high throughput and optimal yield.

air classification particle processing aveka

The AVEKA CCE Technologies‘s High-Efficiency Centrifugal Air Classifier will separate fine, dry particles less than 75 microns by size, shape and density utilizing the opposed forces of centrifugal and drag in close proximity to a high intensity dispersion mechanism. The classifier incorporates an optimized feed introduction which maximizes the effectiveness of the dispersion forces and minimizes distortion of the particle trajectories within the vortex field. This allows the classifier to achieve a precise, predictable and extremely sharp separation at a high solids loading. The Model 100 is the ideal tool for the production of lab size samples, product development and/or small quantity production. Both the Model 250 and 500 offer laboratory precision at production rates.

The flow patterns through the centrifugal air classifier are described as follows: Feed enters the system through the central tube, which is angled to the radial to minimize the distance of coarse particle injection into the vortex due to inertia. The space between the outer edge of the blades and the periphery of the rotor forms the classification zone. Coarse product, which is rejected outward by the centrifugal field, is conveyed out of the classifier through the coarse outlet using a jet pump mounted on a cyclone. The cyclone overflow is returned to the classifier through the recycle port. Fine product leaves the classifier through the central outlet with the primary air flow. The classifiers come complete with all the major components necessary for classification of dry powders in the less than 75 micron range. A typical system includes the classifier assembly, flow source, coarse and fine fraction collectors, feed system and controls.

AVEKA CCE Technologies maintains lab facilities for customer testing, equipment evaluation, and custom processing. Predicting whether a material will respond to air classification successfully can be difficult and often surprising, so it is always worth a feasibility trial to find out.

Capabilities and Equipment Specs

Air Classification Tolling/Test Equipment installed at AVEKA CCE Technologies:

  • Three Model 250 High-Efficiency Centrifugal Air Classifiers
  • One Model 100 High-Efficiency Centrifugal Air Classifier
    • Lab-scale machine for running small quantity feasibility tests for jet milling and/or air classification

Tolling/Test Run Guidelines:

Model No.100250
Minimum run quantity*200 g10 kg
Preferred run quantity*500 – 5000 g225 – 450+ kg
Typical throughput**100 – 400 g/hr.45 – 180 kg/hr.


* For test runs on equipment installed at AVEKA CCE Technologies
** Rates are dependent on materials and conditions

Wear resistant coatings

  • Classifier rotor plasma-coated with tungsten carbide
  • Stator ring lined with tungsten carbide
Factors to Consider
  • What is the particle size of the feed material?
  • What is the target particle size?
  • Is the material a combustible powder?
  • Is the material abrasive?