By Roasting process....(its the answer for 1mark, if you want to know more than visit the page-151, NCERT chemistry book part-1 class-12)
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Niharika Devi answered this
If the sulphide ore of cu contains FeO, then it is mixed with SiO2 before heating.iron oxide "slags of " as iron silicate and cu is produced in the form of cu matte which contains cu2S and FeS.
FeO + SiO2 ----------------------> FeSiO3 (slag)
