TACKLING IMPURITIES IN COPPER CONCENTRATES
Concentrate Cu % As % Sb % Pb % Zn % Co Ni % A 28 7 B 23 ZnS Other Cu S= Cu 2 S CuS Cu 5 FeS 4 Concentrate A has the sulphides being mostly chalcopyrite and some pyrite and a higher gangue fraction Concentrate B distributes its copper mostly between chalcopyrite and tennantite and has considerably more pyrite The mercury mineralogy for