The extraction of copper also involves many steps. The ore used for extraction is copper pyrites. This ore is crushed, concentrated and then heated in the presence of air. During heating the moisture gets expelled and the copper pyrites gets converted to ferrous sulphide and cuprous sulphide.
Blast furnace is used to heat the mixture of roasted ore, powdered coke and sand. In the blast furnace oxidation reactions takes place.Ferrous sulphide forms ferrous oxide which combines with silica and forms the slag.
Cuprous sulphide forms cuprous oxide which is partially converted to cuprous sulphide.