BROYEUR CENTRIFUGE

A centrifugal mill comprising a cylindrical grinding drum, which rotates on its own axis and simultaneously revolves at a constant angular velocity ratio on a circular orbit around a stationary axis of revolution, which is parallel to the drum axis. The distance from the axis of the drum to the axis of revolution is smaller than the radius of the grinding drum. The ratio of the diameter G of the circular orbit to the inside diameter D of the grinding drum is between 0.3 and 1.0 and the ratio R of the angular velocity of the revolution of the grinding drum on the circular orbit around the axis of revolution to the angular velocity of the rotation of the grinding drum on its own axis is in the range from to , the ratio R being considered to be negative when the two angular movements are in opposite senses, and positive when two angular movements are in the same sense. The mill comprises a feeder provided at one end of the grinding drum, and discharge means provided at the other end of the grinding drum.