SortingAir classification



CAS (center charge) Type Air Separator is a dry classifier mainly used for classification of limestone, slaked lime, talc, silica sand, barite, phosphorite, etc.

The circulating gyratory airflow is used for efficiency and dispersion and centrifugal forces enable mass processing. Note that the SAS type with a larger capacity is also fabricated.

The hollow vertical shaft positioned in the center of the double inner-outer casing has the main and sub vanes and a dispersion disk attached to turn slowly. The material is fed through the pipe in the center of the top material inlet and falls onto the center of the dispersion disk to be scattered by centrifugal force. The fine particle portion is carried upward by the circulating airflow generated by the main vane. Receiving further centrifugal force of the sub vanes, far finer particles ascends between the sub vanes and through the orifice of the valve plate. The airflow of the main vane in the upper part carries them out to the outer cylinder and then downward along the outer cylindrical casing. After passing through the cone casing, they are discharged from the fine powder outlet. The coarse powder portion falls along the inside walls of the inner cylindrical casing and passes through the inner cone casing to be discharged via the coarse powder outlet. The route of the circulating airflow is as follows: it ascends the inner cylindrical casing due to the main vane; passes through the orifice (valve plate); is sucked by the main vane to go downward in the outer cylindrical casing together with fine particles, which fall due to the centrifugal effect; passes through the air vane between the inner cylindrical casing and the bottom cone; and returns to the bottom of the inner cylindrical casing. The classification point is adjusted by the number of sub vanes, opening of the valve plate, variation of the main vane and the rotational speed of the main unit to obtain the target particle size.


  1. The air separator generates classifying airflow using the embedded main vane and no external fan is required.
  2. A cyclone or a bag filter for fine particle collection is also unnecessary.
  3. It has many adjustable factors for the desired product particle size. A wide range of products can be dealt with.
  4. It is capable of handling various materials.
  5. A wide range of processing capacity is available. For example, it can deal with 0.3 m3 h to 40.0 m3/h.


  1. Limestone, quicklime, slaked lime, silica sand, coal, talc, barite and phosphorite
  2. Special material such as plant fiber
  3. Removal of foreign matter


Inform us about the followings for inquiry of CAS Type Air Separator.
  1. Material to process

    Ingredients, feed amount ton/h, temperature, particle size distribution, true specific gravity, bulk specific gravity, water content (up to 1% in general for typical usage)

  2. Product

    Classification point (μm or Blaine), allowable coarse particle inclusion %, desired temperature at the outlet, production capacity ton/h

  3. Power supply

    Voltage and frequency

  4. Other information

    Type and size of the mill to combine