Copper is the most noble of the first row transition metals and occurs in small deposits in several countries, Ores of copper include chalcanthite (CuSO 4 .5H 2 O), atacamite (Cu 2 Cl(OH) 3 ), cuprite (Cu 2 O), copper glance (Cu 2 S) and malachite (Cu 2 (OH) 2 CO 3 ). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS 2 ). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.
(i) Partial roasting of Chalcopyrite produces :
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Copper is the most noble of the first row transition metals and occurs in small deposits in several countries, Ores of copper include chalcanthite (CuSO 4 .5H 2 O), atacamite (Cu 2 Cl(OH) 3 ), cuprite (Cu 2 O), copper glance (Cu 2 S) and malachite (Cu 2 (OH) 2 CO 3 ). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS 2 ). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.
(i) 2 CuFeS 2 + 4O 2 ⎯→ Cu 2 S + 2FeO + 3SO 2
(ii) Iron is removed in the form of slag of FeSiO 3
FeO + SiO 2 ⎯→ FeSiO 3
(iii) S 2– acts as reducing species in self reduction reaction
2Cu 2 O + Cu 2 S ⎯→ 6Cu + SO 2
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