### Technical Notes 8 Grinding R P King

A simplified picture of the mill load is shown in figure 83 ad this can be used to establish the essential features of a model for mill power the torque required to turn the mill is given by torque t mcgdc t f 89 where mc is the total mass of the charge in the mill and tf is the torque required to overcome friction power 2 nt 810 for mills of different diameter but running at the