A novel electrochemical recovery method of Co, Cu, Mn and Ni from a reactor based on two immiscible molten phases, to enable selective metal plating, sufficient feedstock dissolution and protection from re-oxidation, was designed and characterized through voltammetry and chronoamperometry. The immiscible phases in the electrolytic cell were NaCl and Na2O-2B2O3 at 1173 K, and the metal feedstock to be recovered was either metal chlorides or metal oxides of Co, Cu, Mn and Ni. Metals could be successfully recovered as plated metal deposits and the formal redox reaction potentials were reported. Metals thermodynamic behavior differences between the cells were analyzed. Analysis of the metal deposits showed that the recovered metals were of high purity (∼99%). This offers an alternative method to recycle valuable metals present in the growing e-waste stream.
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- cyclic voltammetry
- metal recovery
- molten salt
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry