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.
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.
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.
Some examples of materials processed are:
- Activated carbon
- Carbon black
- Chocolate crumb
- Food colourings
- Powder coatings
- Silica gel