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Manipal MET2013ChemistryGeneral Principles and Processes of Isolation of Metals

The final step for the extraction of copper form copper pyrites in Bessemer convertor involves the reaction.

Options

  1. ACu ₂ ~S +2 FeO 2 Cu +2 Fe + SO ₂
  2. BCu ₂ ~S +2 CuO 6 Cu + SO ₂
  3. C4 Cu ₂ O + FeS 8 Cu +2 FeSO ₄
  4. D2 Cu ₂ O + FeS 4 Cu + Fe + SO ₂

Correct answer

B. Cu ₂ ~S +2 CuO 6 Cu + SO ₂

Step-by-step solution

Ore- copper pyrites , CuFeS ₂ Concentrated pyrites ore (froth- floatation process) is roasted below 800^ C . FeS is converted to FeO while copper remains as sulphide. Roasting 2 FeS +3 O ₂ 2 FeO +2 SO ₂⁻ Smelting FeO + SiO ₂ slag FeSIO ₃ ( SiO ₂ . either is present ore or is added) Bessemerisation 2 Cu ₂ ~S +3 O ₂ 2 Cu ₂ O +2 SO ₂2 Cu ₂ O + Cu ₂ ~S 6 Cu + SO ₂ (final step)

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