Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?
ADry grinding of large particles in un-baffed mills
BWet grinding in high viscous suspension
CWet grinding in low viscous suspension
DDry grinding of large particles (upto 1.25 cms)
Correct answer
A. Dry grinding of large particles in un-baffed mills
Explanation
The correct answer is Dry grinding of large particles in un-baffed mills.