The Atritor dynamic classifier mill


The Atritor DCM Mill is one of the most universal milling systems available with independently driven grinding and classifying sections.

It has a wide range of applications producing materials in some instances to less than 15 microns.
Feed material is metered into the mill pneumatically and first passes into the classifier zone where any fraction of the feed that is already inside specification is removed as product, thus avoiding any over-grinding. Oversize is recycled internally to the grinding zone and is returned to the classifier after further size reduction. This process produces a steep size distribution curve.

* Click below for an animation of the DCM system:

Movie size (1.70mb)
Movie size (3.93mb)

Adjustment of the classifier speed controls the size of the product leaving the mill. The product is conveyed pneumatically to a collecting cyclone and/or bag filter. With the application of heat to the inlet air flow, simultaneous drying can be undertaken.


1 - Mill grinding rotor
2 - Dynamic classifier wheel
3 - Air recirculation shroud
4 - Grinding zone
5 - Shaft & bearing assembly


Some examples of materials processed are:


Food colourings
Sugar
Cocoa
Chocolate crumb
Lactose
Vitamins
Pharmaceuticals
Pesticides

Activated carbon
Carbon black
Powder coatings
Pigments
Resins
Silica gel
Zeolites


Technical Data:
DCM
MODEL		 100 200 250 300 400 500 600 800 1000 1200 1400 1700
Mill
kW		 1.1 3 5.5 11 22 37 55 90 160 250 315 450
Classifier kW 0.37 0.55 1.1 1.5 2.2 4 5.5 7.5 11 30 37 90
Mill speed rpm 18000 10800 9400 6200 5000 4300 3300 2600 2100 1850 1650 1400
Classifier speed rpm 10000 5400 4600 4000 3250 2920 2850 2650 2400 2200 2000 1860
Airflow m3/h 100 320 600 1300 2600 4450 6500 10500 18000 28000 36000 52000
Output Factor Lab mill 0.25 0.5 1 2 3.4 5 8 14 22 28 40
Motor sizes and airflows stated are typical and can vary for each
DCM model depending upon application.


The DCM is made in a range of sizes from 1 to 450kW mill rotor drive. For pharmaceutical applications the common mill sizes are the DCM 100, 200, 250 & 300.

Pictured below is a DCM 300 pharmaceutical, GMP, CIP design.

The DCM 800 above is one of a pair processing pharmaceutical and food ingredients. Special design larger mills are available.



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download Food & Pharmaceutical Brochure
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