Study of the rare earth elements fractionation by solvent extraction
Carregando...
Data
Data de publicação:
2001
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
RARE EARTHS'2001
Exportar
Resumo
The influence of the acidity and concentration of the rare earth elements (REE) in aqueous phase, the organic/aqueous phase ratio and
the HCl concentration in stripping was estimated for the REE fractionation by solvent extraction. The assays were performed in batch 21 tests by using 2-ethylhexylphosphonic acid, mono-2-ethylhexyl ester, diluted in isododecane (1 mol l ). The solution studied presented a 21 21 REE concentration of 16.54 g l (Nd 4.84%, Sm 61.36%, Eu 1.75%, and Gd 32.05%) in 0.77 mol l hydrochloric medium. In order to
control the analytical parameters (acidity and concentration of REE) in the aqueous solutions generated by the separation stages of the
batch tests, a high-performance liquid chromatography (HPLC) technique was employed. The REE were separated from each other with
a-hydroxyisobutyric acid as eluent and n-octane sodium sulphonate as modifying agent, in a C reverse phase column. Eluted REE were 18
monitored at 520 nm by a spectrophotometer after a post-column reaction with 4-(2-pyridylazo)resorcinol. Results are reported as
extraction profiles and a chromatogram. For the studied parameters, it was found that, in lower acidity and concentration solutions, higher
extraction percentages for the REE are obtained. In all assays, Gd and Eu were preferably extracted.
Como referenciar
MIRANDA JUNIOR, P.; MADUAR, M.F.; VICENTINI, G.; ZINNER, L.B.; MORAES, N.M.P.; SHIHOMATSU, H.M. Study of the rare earth elements fractionation by solvent extraction: use of HPLC as an analytical control technique. In: RARE EARTHS'2001, Sept. 22-26, 2001, Campos do Jordao, SP. Proceedings... p. 46-50. Disponível em: http://repositorio.ipen.br/handle/123456789/16304. Acesso em: 13 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.