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Metallurgical coke must be strong and porous because in a blast furnace it acts as

  • A.an inert diluent to control the temperature
  • B.fuel, reductant and a permeable support for the burden
  • C.fuel and nothing else
  • D.a flux for the gangue in the ore

Answer: B

It burns to give heat, provides carbon monoxide to reduce the oxide, and must hold the column of ore open so the blast can pass. No other material combines all three functions, which is why coke has not been displaced.

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