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Which of these would be used as an iron-bearing corrective material?

  • A.high-purity limestone
  • B.gypsum from a flue gas plant
  • C.ground granulated slag
  • D.laterite or iron ore fines

Answer: D

Iron lowers the temperature at which the charge begins to melt and forms the ferrite phase in the clinker. Gypsum is added after burning and slag is a blending component rather than a raw mix corrective, so neither belongs in this list.

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