6.13 State the role of silica in the metallurgy of copper.
6.13 State the role of silica in the metallurgy of copper.
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1 Answer
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During the roasting of pyrite ore, a mixture of FeO and Cu2O is obtained.
2 CuFeS2 + O2→ Cu2S + 2 FeS + SO2
2 Cu2S + 3 O2 → 2 Cu2O + 2 SO2
2 FeS + 3 O2 → 2 FeO + 2 SO2
The role of silica in the metallurgy of copper is to remove the iron oxide obtained during the process of roasting as ‘slag’. If the sulphide ore of copper iron, then silica (SiO2) is added as a flux before roasting. Then, FeO combines with silica to form silicate, FeSiO3 (slag).
FeO + SiO2→ FeSiO3 (slag)
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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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