The drum mills are used for fine and ultra-fine grinding of brittle materials. Discontinuous operated drum mills make, in addition to size reduction, homogenization of the material to be ground possible.
Drum mills have a horizontal grinding drum rotating around a fixed center of rotation. Located in this cylindrical working space is a grinding-media filling, which is tumbled by the rotating grinding drum. The material fed is pulverized by the freely moving grinding-media primarily through pressure, impact and shearing action. Balls or Zylpebs are usually used. For special applications, steel rods can also be implemented in appropriately modified drum mills.