Discontinuous drum mills are applied to fine and micro pulverization (in the micrometer range) and simultaneous mixing of relatively coarse materials (up to approx. 30 to 40 mm) of all degrees of hardness. Depending on the nature of the grinding material, differentiation is made between dry and wet grinding
Drum mills have a cylindrical working space situated horizontally, which revolves around a fixed centre of rotation. The grinding material fed into the working space batchwise is tumbled by the revolutions together with a freely moving grinding body filling, being pulverized by the latter primarily through pressure, impact and shearing action.
The main operating conditions for pulverization are the drum speed and filling conditions.