Why is sulphide ore of copper heated in a furnace after mixing with si – InterviewSolution

1.

Why is sulphide ore of copper heated in a furnace after mixing with silica?

Answer»

Iron oxide present as impurity in sulphide ore of copper forms slag which is iron silicate and copper is produced in the form of copper matte.

FeO + SiO₂ → FeSiO₃37.

Sulphides are not reduced easily but oxides are easily reduced.

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