Extraction of copper by smelting uses silica as an additive to remove: Cu2O, FeS, FeO, Cu2S<p></p>

The correct option is C. FeO is gangue and SiO2 is flux to form slag FeSiO3. FeO (basic impurity) + SiO2 (acidic flux) → FeSiO3 (slag). Hence, the correct option is C

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Question:

Extraction of copper by smelting uses silica as an additive to remove: Cu2O, FeS, FeO, Cu2S

Solution: