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

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

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Gibbs free energy of formation(\Delta _{f}G^{0}) of  Cu_{2}S is less than that of  H_{2}S and  CS_{2} so that hydrogen and carbon are unable to reduce 

Cu_{2}S \rightarrow Cu. But the Gibbs free energy of formation(\Delta _{f}G^{0}) of Cu_{2}O is higher than that of CO. So, that carbon can able to reduce

 Cu_{2}O\rightarrow Cu.  Therefore the extraction of copper from its pyrite ore is more difficult than its oxide ore through reduction.

 

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