Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/11172
Title: Separation of cobalt and nickel in leach solutions of spent nickel-metal hydride batteries using aqueous two-phase systems (ATPS).
Authors: Valadares Neto, Alberto
Valadares, Clara França
Lemos, Leandro Rodrigues de
Mageste, Aparecida Barbosa
Rodrigues, Guilherme Dias
Keywords: E-waste
NiMH batteries
Issue Date: 2018
Citation: VALADARES NETO, A. et al. Separation of cobalt and nickel in leach solutions of spent nickel-metal hydride batteries using aqueous two-phase systems (ATPS). Hydrometallurgy, v. 181, p. 180-188, nov. 2018. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0304386X18302093>. Acesso em: 7 mar. 2019.
Abstract: This paper presents the use of an aqueous two-phase system (ATPS) as an alternative to liquid–liquid solvent extraction for the selective removal of cobalt and nickel from nickel metal hydride batteries (NiMH). The optimized extraction conditions were determined with a leach liquor obtained from the NiMH battery residue as a matrix. The effect of several key variables on the metal extraction was evaluated: (i) extractant nature, (ii) pH, (iii) the ATPS-forming electrolyte, (iv) the ATPS-forming copolymer, (v) the ratio between the top and bottom phases, and (vi) liquor dilution. Process efficiency was measured by the percentage of cobalt (%ECo) and nickel (%ENi) extraction and the separation factor between these metallic ions (βCo/Ni). The highest cobalt extraction percentages were obtained for ATPS formed by L64 + Na2SO4 + H2O at pH 5.00, using 1-nitroso 2-naphtol (1N2N) extractant and a liquor dilution factor of 35. At these conditions, %ECo and %ENi were 99.18% and 1.29%, respectively, and βCo/Ni reached 9339 after three successive extraction steps.
URI: http://www.repositorio.ufop.br/handle/123456789/11172
metadata.dc.identifier.uri2: https://www.sciencedirect.com/science/article/pii/S0304386X18302093
metadata.dc.identifier.doi: https://doi.org/10.1016/j.hydromet.2018.09.006
ISSN: 0304-386X
Appears in Collections:DEQUI - Artigos publicados em periódicos

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