Details

Autor(en) / Beteiligte

• Bertuol, D. A.
• Amado, F. D. R.
• Veit, H.
• Ferreira, J. Z.
• Bernardes, A. M.

Titel

Recovery of Nickel and Cobalt from Spent NiMH Batteries by Electrowinning

Ist Teil von

• Chemical engineering & technology, 2012-12, Vol.35 (12), p.2084-2092

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2012

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• For nickel and cobalt recovery from spent NiMH batteries by electrowinning, the effect of different electrowinning parameters as boric acid concentration, temperature, current density, and pH were studied using different synthetic solutions. The optimized operational parameters were applied in an electrowinning test with a solution achieved by leaching the electrodes of NiMH batteries. The electrowinning tests were performed galvanostatically in a two‐compartment cell separated by an anionic membrane. A platinum/iridium‐coated titanium anode and a stainless‐steel cathode were used. A sodium sulfate solution served as anolyte. The results demonstrate the technical viability of nickel and cobalt recovery. The chemical composition of the obtained deposit presented high nickel and cobalt concentrations. The recovery of nickel and cobalt present in spent NiMH batteries was performed by electrowinning. A two‐compartment cell separated by an anionic membrane was constructed to avoid the usual problem of a laborious and reagent‐consuming pH control. The results demonstrate the technical viability of this cell regarding current efficiency improvement, thereby recovering nickel and cobalt in an effective way.