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Mineralisers such as fluoride are sometimes added to a raw mix in order to

  • A.raise the melting point of the charge
  • B.remove the need for any cooling
  • C.allow burning at a lower temperature
  • D.increase the free lime deliberately

Answer: C

Correct answer: allow burning at a lower temperature

A mineraliser such as calcium fluoride lowers the temperature at which the liquid phase forms and at which alite is stable, so the same clinker can be made a good deal cooler. That saves fuel and reduces the thermal load on the refractory, at the cost of a small addition and some care over the effect on setting.

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