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प्रश्न
How is copper extracted from low grade copper ores?
उत्तर
Copper is extracted by hydrometallurgy from low grade copper ores. It is leached out using acid or bacteria. The solution containing Cu2+ is treated with scrap iron, Zn or H2.
\[\ce{Cu^{2+} (aq) + H2 (g) -> Cu(s) + 2H^{+} (aq)}\]
\[\ce{Cu^{2+} (aq) + Fe(s) -> Cu(s) + Fe^{2+} (aq)}\]
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