Peer-reviewed veterinary case report
Processing and Characterization of Spent Nickel-Metal Hydride Type AA Batteries to Recover Valuable Materials (Cobalt, Nickel and Rare Earth Elements).
- Year:
- 2024
- Authors:
- Iacob G et al.
- Affiliation:
- Department of Engineering and Management of Metallic Materials Production
Abstract
The experimental research was focused on the investigation of valuable material from spent Ni-MH type AA batteries, namely the metal grid anodes and the black mass material (anode and cathode powder). The materials of interest were analyzed by X-ray fluorescence spectroscopy (XRF), ICP-OES (inductively coupled plasma optical emission spectrometry), optical microscopy, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). The analyzed grids have a high Fe content, but some of them correspond to the Invar alloy with approx. 40% Ni. In the black mass material, round particles and large aggregations were observed by SEM analysis, showing a high degree of degradation. The XRD analysis reveals the presence of only three compounds or phases that crystallize in the hexagonal system: La<sub>0.52</sub>Ce<sub>0.33</sub>Pr<sub>0.04</sub>Nd<sub>0.11</sub>Co<sub>0.6</sub>Ni<sub>4.4</sub>, Ni(OH)<sub>2</sub>, and La<sub>5</sub>Ni<sub>19</sub>. The obtained results provide useful and interesting information that can be used for further research in the recycling and economic assessment of metals from spent Ni-MH batteries.
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Search related cases →Original publication: https://europepmc.org/article/MED/39410480