Question

Explain the process of roasting with reference to copper.

Answer 1

Answer. Roasting: It is a process of heating the concentrated ore to a high temperature in excess of air. For example; copper pyrite (CuFeS2) is strongly heated in excess of air to convert it into a mixture of cuprous sulphide and ferrous sulphide (Cu2S + FeS). While impurities sulphur, phosphorus arsenic etc. react with oxygen to form volatile oxides. Such as

    2 CuFeS2(8) + O2(g)   ———> Cu2S(s) + 2FeS(s) + SO2(g)

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