Extraction of copper from copper pyrite C u F e S 2 involves

1. Crushing followed by concentration of the ore by froth-flotation
2. Removal of iron as slag
3. Self-reduction step to produce 'blister copper' following evolution of $\mathrm{S}{\mathrm{O}}_2$
4. Refining of 'blister copper' by carbon reduction

Asked in: JEE Advanced 2016 (Paper 2)

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