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The silica modulus of a raw mix relates silica to

  • A.the lime content of the mixture
  • B.the gypsum added at the grinding stage
  • C.the magnesia present as an impurity
  • D.the sum of alumina and iron oxide

Answer: D

A high value gives less liquid phase in the kiln, which makes the mix harder to burn but produces a clinker of different character. It is used alongside the lime saturation factor to control the mix. Together the two moduli largely fix the character of the clinker.

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