6.7 Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
6.7 Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
The Gibbs free energy formation ( ΔfG) of Cu2S is less than that of H2S and CS2. Therefore, H2 and C cannot reduce Cu2S to Cu.
On the other hand, the Gibbs free energy formation of Cu2O is greater than that of CO. hence, C can reduce Cu2O to Cu.
C (s) + Cu2O (s) → 2Cu (s) + CO (g)
Hence, the extraction
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Na+ C + N + S ®NaSCN
Fe3+ + SCN–
In the metallurgy of aluminium, purified Al2O3 is mixed with Na3AIF6 or CaF2 which lowers the melting point of the mixture and brings conductivity.
Ellingham diagram explains the feasibility of reduction process not the kinetics of process.
Malachite : CuCO3.Cu (OH)2
Azurite : 2CuCO3.Cu (OH)2
Cuprite : Cu2O
Copper pyrite : Cu2S.Fe2S3.
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