1.

Explain the smelting process.

Answer»

The roasted ore of copper is mixed with powdered coke and sand and is heated in a blast furnace to obtain matte (Cu2S + FeS) and slag. The slag is removed as waste. 

2 FeS + 3O2 → 2 FeO + 2 SO2 

2 Cu2S + 3O2 → 2 Cu2O + 2SO2 

Cu2O + FeS → Cu2S + FeO

FeO + SiO2 → FeSiO2 (slag)



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