Air Classifying Mill (ACM)

RIECO Air classifier Mill (ACM) is an air classifying mill with integrated grinding, classifying, conveying, and collecting operations for achieving ultra-fine grinding (up to 2 micron*) depending upon the nature of the product.

Air classifying Mill / Air classifier Mill (ACM) can be designed for grinding hygroscopic, heat sensitive and explosive materials in inert gas/ closed loop systems with dry chilled air. Our classifiers are engineered to consistently produce steep particle size distributions that are uniform and homogeneous.

Working Principle

The material to be grinded is conveyed from the hopper to the grinding chamber by the variable feed screw mechanism. The grinding occurs when the product meets a pin or bar type rotor disc. As particles are reduced in size they are entrained by the Air stream which enters below the rotor and are carried up between the inner wall and shroud ring with baffles, the particles are then deflected by an air dispersion ring to the separator assembly. Acceptable product is drawn through the exhaust and is collected by a high efficiency bag filter. Oversize particles are carried downward by internal circulating air stream and return to Rotor for additional grinding.

  • Modern, Economical, simple
  • High Pressure Mills for dust explosive materials
  • Closed Loop systems in inert atmosphere for explosive, heat sensitive and hygroscopic materials.
  • Heat Exchanger based cool grinding system for non-explosive heat sensitive material.
  • Grinding and Classifying in one machine with online granulation adjustment.
  • Dust free Operation
  • Uniform particle size distribution with narrow bandwidth.
  • Mills can be provided with Online classifier (Micron separator) to further achieve sharp particle cut point
  • Low specific energy requirement
  • ACM variant with Independent Drive classifier available for sticky materials.
  • All RIECO ACM mills are equipped with protection devices for safe operation. These measures include a safety switch on the cover of the grinding chamber. It is thereby ensured that the drive motors cannot be switched ‘ON’ when the grinding chamber cover is open
  • The plant is supplied along with a control panel and MCC which provides the necessary interlocks and operating switchess
  • The mill and all drive components are mounted on a rigid welded steel frame. All rotating parts are dynamically balanced for smooth operation. There is no need for special foundation.

The ACM Plant Includes:

  • ACM Mill for grinding and classifying.
  • High efficiency bag filter with automatic pulse jet cleaning
  • Rotary Airlock (used for air seal and discharge material from bag filter)
  • Centrifugal Fan (provide air flow through the mill and the collector for product conveying and cooling.)
  • Control Panel (sequential starting and stopping of the milling plant)
Mill Main Motor HP Rotor RPM Classifier Motor HP Classifier RPM
ACM 5 5 9400 1 5400
ACM 10 10 7000 1.5 5000
ACM 30 30 4600 7.5 2500
ACM 30 (ID) 30 5000 7.5 3000
ACM 60 60 3000 15 2000
ACM 60(ID) 60 3500 15 3000
ACM 75(ID) 75 3500 15 3000
ACM 100 100 3000 15 2000
ACM 100(ID) 100 3500 15 3000
ACM 120 120 2200 20 1800
ACM 150 150 2200 20 1800
ACM 200 200 2200 30 1800
Chemical Food, Spices &
Paints & Pigments Pharma-ceutical Agro-chemicals Minerals
Phenolic resins Turmeric Pigments Active Pharmaceutical Ingredients Wettable pesticides Calcined clay
Toner Powders Gluten Dyes Bulk Drugs Insectides Kaolin
Talc Sugar Colours Nutraceuticals Fungicides
PPT Silica Soya Powder coatings Proteins Herbicides Wollastonite
Metal Stearates Ultrafine flour of
pulses, grain
Food Colour Ceramic Colours
Modified Starch Besan (gram flour)


Agro - chemicals
Pharma - ceutical

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