The operating speed of a ball mill should be ______________ the critical speed?
Correct answer: D. Less than
- A. Slightly more than
- B. Much more than
- C. At least equal to
- D. Less than
Explanation
A ball mill is operated below its critical speed so that the balls are lifted and then fall or cascade through the material. At the critical speed, centrifugal force holds the balls against the shell and grinding becomes ineffective.
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