MetallurgyHard

Question

Which of the following process(es) occur(s) during the extraction of copper from chalcopyrites ? 

Options

A.Froth floatation
B.Roasting
C.Bessemerisation
D.calcination

Solution

(A) Sulphides ores are generally concentrated by froth floatation.
(B) 2CuFeS2 + 4O2 Cu2S + 2FeO + 3SO2
Cu2S + FeO + SiO2 → FeSiO3 (fusible slag) + Cu2S (matte)
(C) Bessemerisation
2FeS + 3O2 → 2FeO + 2SO2
FeO + SiO2 → FeSiO3
2Cu2S + 3O2 → 2Cu2O + 2SO2
2Cu2O + Cu2S → 6Cu + SO2      (self reduction).

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