Figure 4 represents the schematic diagrams of some dry grinding devices used for superfine food powders processing, such as pin and disc mill (Jiang et al., 2017), media agitating mill (Hu et al., 2012), hammer mill/wing beater mill (Zhu et al., 2012), cutting granulator/knife mill granulator (Niu, Zhang, Jia, Zhao, 2017), and roller rubbing. Ball mill is a cylinder rotating at about 70-80% of critical speed on two trunnions in white metal bearings or slide shoe bearings for large capacity mills. Closed circuit ball mill with two compartments for coarse and fine grinding and a drying compartment with lifters are generally found in cement plants for raw material grinding. Build An Ultra-fine Grinding Mill KingStar. Mobile crushing plant. Coarse and fine in less than 800 mm stones are rubble into sand Multiple combination, 85-650 t/h production design more efficient Back to the fast, the 05-12-13 standard stone products easily. DISCOVER MORE.