Extração liquido-liquido por fase unica de Ce, La, Pv, Nd, Sm, Eu, Gd, Dy, e Y e estudo de separação de terras raras de monazita brasileira : sistema agua-etanol-MIC e HTTA

AUTOR(ES)
DATA DE PUBLICAÇÃO

1990

RESUMO

By the use of thenoyltrifluoroacetone in the system water-ethanol-MIBK, the single-phase extraction of Ce, Nd, Sm and Dy has been studied. All of these ions showed extraction yields higher than 99% with HTTA concentration of 1,7 x 10M. All extraction curves lie on the same pHFU region, significant difference being observed only for the metallic ions placed on the opposite extremes of the lanthanidic series (i.e.: Ce-Dy). By using substequiometric amount of the chelating agent, single-phase extraction were performed in a comercial grade R.E. mixture, so called "Rare Earths Chloride". When single-phase extractions are performed in pHFU´s lower than 2,5, the heavy R.E. are significantly enriched, since under these same conditions the extraction of the light R.E. is very small.

ASSUNTO(S)

terras raras - analise extração por solventes estração (quimica)

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