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

NEETprep Answer: 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)+ + 12O2(g)  Cu(aq)2+ + 2H2O(I)

The resulting solution is treated with scrap iron or H2 to get metallic copper. 

Cu(aq)2+ + H2(g)  Cu(s) + 2H(aq)+