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Why is the extraction of copper from pyr...

Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

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The Gibbs energies of formation of `Cu_(2)S` (present in copper pyrite) is greater than those for `CS_(2) and H _(2)S` . Carbon disulphide is in fact an endothermic compound. So neither carbon nor hydrogen is a suitable reducing agent for this, reduction. However, the roasting of a sulphide to the oxide is quite advantageous thermodynamically. Hence, the common practice is to roast sulphide ore to the oxide before reduction.
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