Air Classifier


  • Strong construction of mechanism and casing ensures long life.
  • Close control over product uniformity.
  • Minimum loss of fines in the tailings.
  • Special liners are available for processing abrasive materials.


The Air Classifier is a centrifugal type classifier used to separate dry powdered materials into fine and coarse fractions. It may be operated in closed circuit with a grinding mill or used in open circuit operation, receiving the feed from hoppers, bins screens.

Fineness Control

The classifier fineness characteristics are controlled mainly by changing the number, size of whizzer blades or by adjustment of vertical slide dampers. These adjustments can be conveniently made to produce the product of required fineness. Tyco classifiers are capable of delivering fine products from 80–85 % passing 60 mesh to as fine as 99.9% passing through 100 mesh depending upon the material characteristics.

Application in Closed Circuit Grinding

When operated in closed circuit, combination with a Pulveriser the separator skims off the fines as fast as they are made, so that the mill works only on fresh material without wasting power. The tailings are discharge back to the mill for further reduction. The reground material is returned to the separator with the feed, so that constant circulating load set up between the mill & the separator.

The Advantages in using Mechanical Air Separator in Closed Circuit with the Grinding Mill for Producing Closely Sized Finished Products include the Following

  • Positive control of Fineness or surface area, and the elimination of over sized particles.
  • For convenient variation of product fineness, vertical dampers permit wild range changes in fineness, externally while the separator is in operation.
  • Increasing the capacity or output of the grinding mill performance, reports have shown increases from 25-75 % or more.
  • Lowering the temperature of the mill & product.
  • Improvement in grinding efficiency, as in the case of Ball mills where ball coating with the fine material can materially impair grinding ball effectiveness.


ModelMotor HpFeed Inlet DiaAppro. Overall DimensionsApprox. Discharge Height above standard supporting structure
AC - 30 7.5 64 mm 1 m x 1 m x 2.3 m Ht 1.3 Mtrs
AC – 72 15 102 mm 2.2 m x 2.2 m x 3.9 m Ht 1.3 Mtrs

Typical Applications of Air Classifiers


Used enclosed circuit grinding operations for classifying raw mix and finished cement.


To meet close specifications of granular sand material used in bituminous concrete, mortar and as an aggregate.

Flour Mixes

For uniform mixes and enriched grades of flour.

Soda Ash

De–dusting to remove undesirable fines fraction - for example removing feed of 15%–20% passing 200 mesh and delivering a tailings product of 5% or less passing 200 mesh.

Hydrated lime

Produces a high fineness, uniformly classified hydrated lime for chemical and spray purposes. Maximum quantity of calcium hydrate is assured with close control of both fineness and quantity.

Food Products

For classifying for various food products such as sugar, cocoa, milk powder, corn, wheat starch and Soya bean meal etc.


Wide range of applications where manufactured chemicals are required in closely sized form.


In benefaction of a wide variety of minerals such as talc, kaolin, clays, phosphate rock etc. The quality of the material is upgraded by removing impurities in the form of silica, flint and other foreign materials.

Metal Powders

For classifying metal powders consisting of copper, bronze, iron and various alloys.

Examples of material handled by Tyco mechanical Air Classifiers
Barites Lime(Hydrate)
Chalk Lime(Slaked)
ChinaClay Limestone
Coal Portlandcement
FlyAsh Slate
Foodstuffs SilicaSand
Gypsum SoyaFloor

Powder Processing Technology

Tyco offers internationally accepted and proven technology for the processing of powdery materials along with a comprehensive range of machines and turn-key plants for beneficiation, size reduction, batching, blending, weighing and bagging with complete automation through Electronic microprocessor/PLC/PC based systems. With over 600 customers in India and abroad, Tyco provides comprehensive design, manufacturing and after-sales service with a team of well-trained engineers and technicians.

A Few of our Clients

  • ayurvet
  • dabur
  • grasim
  • himalaya
  • hindustan-unilever-limited
  • iocl
  • jindal-steel-power
  • kci
  • kisan-veer-satara-co-operative-sugar-factory
  • kores
  • oushadhi
  • sail
  • tata-tata-sponge
  • the-arya-vaidyasala
  • tvs