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How is leaching carried out in case of l...

How is leaching carried out in case of low grade copper ores?

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In case of low grade copper ores, leaching is done by using acid or bacteria. The solution containing `Cu^(2+)` is treated with scrap iron or `H_(2)`
`Cu^(2+)(aq) +H_(2)(g) to Cu(s) +2H^(+) (aq)`
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