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Critical rotation speed of dry ballmill was studied by experiments and by numerical simulation using Discrete Element Method DEM The results carried out by both methods showed good agreement It has been commonly accepted that the critical rotation speed is a function of a ballGet PriceBall Mill Critical Speed Mineral Processing & MetallurgyA Ball Mill Critical Speed (actually ball, rod, AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell’s inside surface and no balls will fall from its position onto the shell. The imagery below helps explain what goes on inside a mill as speed varies. 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