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Explain the steps for the extraction of copper from its sulphide ore. Write the balanced equations involved in the process.
Given below are the steps for the extraction of copper from its Sulphide ore:
a)Concentration of the ore: Removal of unwanted metals and gangue to purify the ore is done by Froth floatation method as it is a sulphide ore.
b)Roasting: Copper glance (Cu2S) is roasted in the presence of air.
$2Cu_{2} S( s) +3O_{2}( g) \ \rightarrow 2Cu_{2} O( s) +2SO_{2}( g)$
c)Reduction: Copper oxide is then heated in the absence of air. Reduction of copper (I) oxide with copper (I) sulphide:
$2Cu_{2} O+Cu_{2} S\rightarrow 6Cu( s) +SO_{2}( g)$
This reaction is known as auto -reduction.
d)Reaction for electrolytic refining:
$At\ anode\ :\ Cu^{2+}( aq) +2e^{-}\rightarrow Cu( s)$
$At\ cathode\ :\ Cu( s) \ \rightarrow Cu^{2+}( aq) +2e^{-}$
Updated on: 10-Oct-2022
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