DRUM MILL TM 500 RETSCH
22 l sample were filled in the drum of the Drum Mill TM 500, 80 kg of 30 mm grinding balls were added. The drum mill was operated for several hours at 50 rpm. The fineness was measured after 1 h. 1h: D90 = 130 µm The optional separation unit to separate the ground sample from the balls was used.