Extraction of copper from copper pyrite $\left(\mathrm{CuFeS}_{2}\right)$ involves

(A) crushing followed by concentration of the ore by froth-flotation; (B) removal of iron as slag; (C) self-reduction step to produce 'blister copper' following evolution of $\mathrm{SO}_{2}$

(D) refining of 'blister copper' by carbon reduction

JEE Advanced · 2016 · 22 May 2016 · Paper 2 · General Principles and Processes of Isolation of Metals

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Extraction of copper from copper pyrite

(CuFeS_{2})

involves

(A)crushing followed by concentration of the ore by froth-flotation✓ Correct
(B)removal of iron as slag✓ Correct
(C)self-reduction step to produce 'blister copper' following evolution of $SO_{2}$ ✓ Correct
(D)refining of 'blister copper' by carbon reduction

Answer: (A), (B), (C)

Solution

Copper extraction from

CuFeS_{2}

involves: (1) crushing and froth-flotation concentration, (2) roasting and smelting where iron is removed as slag (

FeSiO_{3}

), (3) self-reduction (Bessemer process) where

Cu_{2} S

reacts with

Cu_{2} O

to give blister copper with

SO_{2}

evolution. Refining of blister copper is done by electrolytic refining, not carbon reduction.

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JEE Advanced · 2016 · 22 May 2016 · Paper 2 · General Principles and Processes of Isolation of Metals

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