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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 ? | |
A. | Wet grinding in low viscous suspension. [Wrong Answer] |
B. | Wet grinding in high viscous suspension. [Wrong Answer] |
C. | Dry grinding of large particles (upto 1.25 cms). [Wrong Answer] |
D. | Dry grindng of large particles in un-baffed mills. [Correct Answer] |