Green selective recovery of lanthanum from Ni-MH battery leachate using aqueous two-phase systems.
Nenhuma Miniatura disponível
Data
2017
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
In view of the importance of resource recycling and the use of environmentally safe systems to extract the
metals contained in wastes, the present study concerns the extraction/separation of lanthanum from spent
Ni–MH batteries. Investigation was made of the extraction behavior of lanthanum using aqueous twophase
systems (ATPSs), and a new environmentally safe hydrometallurgical method was developed for
the selective extraction of La from Ni-MH battery leachate. The extraction behavior of La was evaluated considering
the influence of the following parameters: concentration of different extractant; pH; ATPS-forming
electrolyte (Li2SO4, Na2SO4, MgSO4, Na2C4H4O6, or Na3C6H5O7); ATPS-forming polymer (L64 or PEO1500).
The recovery efficiency was evaluated by analyzing the extraction percentage (%E), and the best conditions
for analyte extraction were achieved using the ATPS formed by PEO1500 + Li2SO4, at pH 6.00, with
1,10-phenanthroline as the extractant agent (%E = 74.1%). The method was applied to a real Ni-MH battery
leachate. After three successive extraction steps, high separation factor (S) values were obtained for the separation
of lanthanum from concomitant metals (SLa,Ce = 180; SLa,Pr = 184; SLa,Nd = 185).Astripping assay was
carried out, and after a single step, 88.5% of the lanthanum was available for a possible electrowinning step.
Descrição
Palavras-chave
Aqueous two-phase systems, Lanthanum, Hydrometallurgy, Green chemistry
Citação
OLIVEIRA, W. C. M. de et al. Green selective recovery of lanthanum from Ni-MH battery leachate using aqueous two-phase systems. Chemical Engineering Journal, v. 322, ago. p. 346-352, 2017. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1385894717305788> Acesso em: 15 set. 2017.