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Zirconia grinding media are often chosen in preference to alumina because they are

  • A.a very great deal cheaper to buy in bulk quantities
  • B.the only media that will not contaminate a batch at all
  • C.softer and therefore altogether gentler on the powder
  • D.denser and harder, giving faster grinding with less wear

Answer: D

Greater density means more energy in each collision and greater hardness means slower wear, so the grind is quicker and cleaner. The cost per kilogram is considerably higher, which is the reason alumina remains in wide use.

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