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A ball mill grinds material principally by

  • A.dissolving the material away in a hot liquid
  • B.impact and attrition from tumbling steel balls
  • C.compression between two counter-rotating rollers
  • D.cutting the particles apart with hardened blades

Answer: B

Correct answer: impact and attrition from tumbling steel balls

The mill rotates fast enough to carry the charge up the shell and let it fall back, so the balls break material by impact and grind it by rubbing against one another as they roll. Both mechanisms operate together, and the ball size distribution is chosen to give the right balance between them along the mill.

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