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Hydraulic classification separates particles according to their

  • A.settling velocity in water
  • B.colour when they are wetted
  • C.electrical conductivity
  • D.melting temperature

Answer: A

Coarse and dense particles settle faster and are removed, leaving the fines in suspension. It is the same principle as sedimentation size analysis applied at production scale rather than in a laboratory. Hydrocyclones do the same job continuously and at much higher throughput.

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