Copper is extracted from copper pyrites by

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(D) Copper is extracted from copper pyrites $(CuFeS_{2})$ by the auto-reduction process. The steps are as follows:$2 CuFeS_{2} + O_{2} \longrightarrow

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auto reduction

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(D) Copper is extracted from copper pyrites $(CuFeS_{2})$ by the auto-reduction process. The steps are as follows:$2 CuFeS_{2} + O_{2} \longrightarrow Cu_{2}S + 2 FeS + SO_{2}$$2 FeS + 3 O_{2} \longrightarrow 2 FeO + 2 SO_{2}$$FeO + SiO_{2} \longrightarrow FeSiO_{3}$$2 Cu_{2}S + 3 O_{2} \longrightarrow 2 Cu_{2}O + 2 SO_{2}$$2 Cu_{2}O + Cu_{2}S \longrightarrow 6 Cu + SO_{2}$In the final step,$Cu_{2}O$ reacts with $Cu_{2}S$ to produce metallic copper,which is known as auto-reduction.

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