Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 326, Issue -, Pages 77-86Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.12.021
Keywords
Spent lithium-ion batteries; Recovery; Valuable metals; Phosphoric acid; Leaching
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Funding
- Fundamental Research Funds for the Central Universities of Central South University [72150050350]
- National Natural Science Foundation of China [21176266]
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Sustainable recycling of valuable metals from spent lithium-ion batteries (LIBs) may be necessary to alleviate the depletion of strategic metal resources and potential risk of environmental pollution. Herein a hydrometallurgical process was proposed to explore the possibility for the recovery of valuable metals from the cathode materials (LiCoO2) of spent LIBs using phosphoric acid as both leaching and precipitating agent under mild leaching conditions. According to the leaching results, over 99% Co can be separated and recovered as Co-3(PO4)(2) in a short-cut process involved merely with leaching and filtrating, under the optimized leaching conditions of 40 degrees C (T), 60 min (t), 4 vol.% H2O2, 20 mLg(-1) (L/S) and 0.7 mol/L H3PO4. Then leaching kinetics was investigated based on the logarithmic rate kinetics model and the obtained results indicate that the leaching of Co and Li fits well with this model and the activation energies (Ea) for Co and Li are 7.3 and 10.2 kJ/mol, respectively. Finally, it can be discovered from characterization results that the obtained product is 97.1% pure cobalt phosphate (Co-3(PO4)(2)). (C) 2016 Elsevier B.V. All rights reserved.
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