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

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