Question

Critical speed of ball mill depends on__

Answer 1

The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the mill. ... This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.

Answer 2

Actually critical speed of ball mill depends on 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.

It depends upon the magnitude and location of the shaft unbalance, the length of the shaft, its diameter, and the kind of bearing support.