Partial roasting of chalcopyrite produces _______________.

Roasting of CuFeS2 produces Cu2S and Fe2S first. However Cu2S and Fe2S converts into Cu2O and FeO. In this process copper matte (Cu2S+FeS(littile)) is formed. 2CuFeS2+O2→Cu2S+2FeS+SO2↑ 2Cu2S+3O2→2Cu2O+2SO2↑ 2FeS+3O2→2FeO+2SO2↑