cyclone separator / particle / powder / construction
Cyclonic Air Classifier (High Efficiency Cyclones Metso Corporation



  • Technology:


  • Separated substance:

    particle, powder

  • Application domain:


  • Other characteristics:

    dry, classifier

  • Width:

    2.1 m (6'10")

  • Filtration size:

    Min.: 5 µm

    Max.: 10 µm

  • Flow rate:

    Min.: 0.5 m³/s (17.657 ft³/s)

    Max.: 50 m³/s (1,765.733 ft³/s)


These high efficiency cyclonic air classifiers take advantage of the principle that particles of different sizes, shapes, or specific gravities can be separated through the use of an upward flow of air creating variations in the ascending vortex.

Provides maximum separation of particles between the range of 5-10 microns
High efficiency (98%+) collection of a variety of materials
Uniquely designed inlet scroll eliminates currents perpendicular to main direction of gas flow, unlike conventional rectangular entrance cyclones

Ability to create particle size separation using bleed air control
Reduces loading to or eliminates fabric filter
Capable of withstanding high temperature process applications using low alloy steel, where required
Fabrication offered in mild carbon steel, stainless steel, and aluminum
Abrasion resistant plate, ceramic lining, or refractory lining also available for various degrees of abrasive applications

Process overview
The feed material to be classified is conveyed pneumatically into the cyclone through the inlet scroll where it is transferred into a fluidizing air stream. The ascending vortex carries the fine material out of the top of the classifier through the gas outlet tube. The coarse material is disengaged from the airstream in the disengaging hopper where it discharged out the bottom of the cyclone through an airlock or into a sealed container. The degree of classification is determined by the amount of reverse flow, inlet air volume, collector type/size, and the specific characteristics of the materials to be classified.