Which process of metallurgy of copper is represented by below equation?

                   2CuFeS₂ + O₂ → Cu₂S + 2FeS + SO₂

Roasting 

Extraction of a metal from its oxides is easier, so we convert the copper iron sulphide first into copper sulphide and then convert it into copper oxide. -Roasting is always done in the presence of air supply. - Main function of roasting is removing volatile impurities and converting the ore into oxide.