Abstract: A bowl having a bottom discharge opening is mounted at its periphery on a frame for rotation about an upright axis. A discharge gate is mounted on the frame under the bowl for movement along the bowl axis to control the discharge opening. A top inlet opening directs material to be processed onto the discharge gate. This material is propelled in a straight line radially up the inner wall of the rotating bowl by centrifugal force between radial vanes. Stationary guide vanes are suspended within the interior of the bowl to intercept the material at the upper margin of the bowl and direct the material in streams which collide in the center of the bowl to mix and/or triturate the material. Turning vanes or discharge cups are mounted for movement into registration with the guide vanes to direct the streams toward the discharge opening when the discharge gate is open.

Abstract: An autogenous triturator mill for reducing particle size by colliding streams of particles in the center of a rotating bowl includes a bowl with radial vanes which is supported on a frame for rotation by a motor. Deflectors on the frame and located within the bowl intercept material centrifugally elevated in the bowl and direct the material inwardly in the form of a plurality of intersecting streams. Collision of particles in the intersecting streams reduces particle size. The concave sides of the bowl are provided with screens or foraminous walls to enable escape of fines of a pre-selected particle size from the bowl. The fines are fractioned off through the foraminous outlet as the particle size is reduced by repeated trituration or collision of the recirculating particles.