Mill with streamlined space

Abstract

The method and the device relate to a rotor which rotates about a vertical axis and is fitted in a streamlined mill in which the stationary collision surface is constructed as a smooth (cylindrical) collision ring and is arranged an adequate distance away from the rotor and thus makes it possible to allow the material to collide, optionally several times, in an essentially completely deterministic manner, or at an essentially predetermined collision location, at an essentially predetermined collision velocity and at an essentially predetermined collision angle; by which a high probability of breakage—and thus the degree of comminution—is achieved, the energy consumption is reduced, wear is restricted and a crushed product is produced which has a regular grain size distribution, a restricted amount of undersize and oversize and a very good cubic grain configuration, the effect—i.e. the determinism—essentially not being influenced by the wear on the collision element, while the material does not rebound (or at least rebounds to a much lesser extent) against the rotor.