Explain the hydrometallurgical process with a suitable example.

(N/A) The extraction of metals by using their aqueous solutions is called hydrometallurgy.
Example: $Au$,$Ag$,and $Cu$ are extracted by this method.
The copper from low-grade ores and scraps is extracted by hydrometallurgy. It is leached out using acid or bacteria. The solution containing $Cu^{2+}$ ions is treated with scrap iron or $H_{2}$ gas.
The chemical reaction is:
$Cu^{2+}_{(aq)} + H_{2(g)} \rightarrow Cu_{(s)} + 2H^{+}_{(aq)}$