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How Does a PPS Air Classifier Mill Work

How Does a PPS Air Classifier Mill Work?

PPS Air Classifier Mill - How it WorksThe PPS Air Classifier Mill is a vertical grinding mill incorporating an internal air classifying wheel with an independent drive.

Product is fed into the grinding chamber by either a feed screw or a pneumatic conveying system via a rotary feed valve. 

The product is impacted by the high speed grinding media, which causes the feed product to fracture and be thrown by the centrifugal force to the wall of the grinding chamber, which in turn, causes the product to fracture further.  The fractured particles are entrained in the induced airflow liberating the outside wall of the internal baffle assembly, which is fitted with air baffles to laminar the air flow.  The laminar airflow and particles pass to the internal classifier, which is rotating, in the same direction as the rotor disc.  Oversized particles rejected by the centrifugal force applied by the classifying wheel are thrown to the inner wall of the baffle and move down by gravity and by the pressure created by the classifier.  These oversized particles are then re-entrained into the grinding zone where further impact occurs.

This recycle action continues until all the particles pass through the classifier wheel.  The product being emitted from the classifier is conveyed in the process air stream where it is either collected in a cyclone or enhanced by further classification in a cyclonic classifier.


PPS Air Classifier Mills are supplied for either batch process or for continuous operation.  They are utilized in industries that produce fine powders where control of the particle size distribution is required.  Typical applications are; Chemical, Minerals, Pharmaceuticals, Food, Powder Coatings, etc.  All systems are designed to handle both inert and explosive applications where venting or containment is required.

PPS Air Classifier MillTypical Applications include:

Food Industry
Chemical Industry

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