For efficient grinding, ball mills must be operated__________________?
Correct answer: D. At a speed less than the critical speed
- A. With minimum possible small balls
- B. At a speed more than the critical speed
- C. At a speed equal to the critical speed
- D. At a speed less than the critical speed
Explanation
Above the critical speed, centrifugal force holds the balls against the mill wall and prevents effective impact and cascading. Efficient grinding therefore requires operation below the critical speed.
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