### Derivation To Calculate Critical Speed Of Ball Mill Mining

Ball mill critical speed 911 metallurgist. 19/06/ charge movement at various mill critical speed the formula derivation ends up as follow: critical speed is: n c =766(d 05) where: n c is the critical speed,in revolutions per minute, d is the mill effective inside diameter, in feet example: a mill measuring 11’0” diameter inside of new shell liners operates at 173 rpm critical speed.