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Question
How is leaching carried out in case of low grade copper ores?
Solution
In case of low grade copper ores, leaching is carried out using acid or bacteria in the presence of air. In this process, copper goes into the solution as Cu2+ ions.
`Cu_((s)) + 2H_((aq))^+ + 1/2O_(2(g)) -> Cu_((aq))^(2+) + 2H_2O_((l))`
The resulting solution is treated with scrap iron or H2 to get metallic copper.
`Cu_((aq))^(2+) + H_(2(g)) -> Cu_((s)) + 2H_((aq))^+`
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