The effects of lifter configurations and mill speeds . - AIP Publishingfiner than at 70% critical speed, while that of Hi lifter otherwise occurs. . Keywords: grinding mills, lifter shapes, mill speed, mill power draw, ball trajectory.critical rpm of mill,critical rpm of mill,SAGMILLING.COM .:. Mill Critical Speed DeterminationThe "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's inside surface.
critical rpm of mill