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Calcination of a ceramic raw material before milling is carried out to

  • A.reduce the particle size right down as far as submicron dimensions
  • B.add the binder uniformly throughout the whole of the powder
  • C.remove every last trace of the iron present as an impurity
  • D.decompose carbonates or hydroxides and form the desired phase

Answer: D

Heating drives off carbon dioxide or water and allows the wanted compound to form by solid-state reaction. Milling afterwards breaks up the hard agglomerates that calcination tends to produce. The second milling is generally shorter than the first.

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