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CGP EDU Academic Team
Published on: August 13, 2026
Which of the following processes occurs during the extraction of copper from chalcopyrites ?
Text Solution
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(a, b, c)
Sulphides ores are generally concentrated by froth floatation.
2CuFeS2 + 4O2 
Cu2S + 2FeO + 3SO2
Cu2S + FeO + SiO2 ¾® FeSiO3 (fusible slag) + Cu2S (matte)
Bessemerisation
2FeS + 3O2 
2FeO + 2SO2
FeO + SiO2 
FeSiO3
2Cu2S + 3O2 
2Cu2O + 2SO2
2Cu2O + Cu2S 
6Cu + SO2 (self reduction).
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