How is copper extracted from low-grade copper ores?
Copper is extracted by hydrometallurgy from low-grade copper ores. Cu is treated with scrap iron or H2. It is leached out with acid.
Cu2+(aq) + H2(g) → Cu(s) + 2H+(aq)
31. Write two basic requirements for refining of metal by Mond process and by Van Arkel Method.
(i) The metal should react easily with the reagent to form the complex.
(ii) The volatile complex should easily decompose and not give any side products and the recovery should also be easy.