Solubility behavior of rare earths with ammonium carbonate and ammonium carbonate plus ammonium hydroxide: precipitation of their peroxicarbonates
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2008
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Journal of Alloys and Compounds
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The purpose of this work is to report the significant behavior of the rare earths when treated with ammonium carbonate and with a binary mixture
of ammonium carbonate plus ammonium hydroxide. The carbonates of some rare earths are completely soluble in ammonium carbonate or in
ammonium carbonate plus ammonium hydroxide, while others are only partially soluble and finally some are completely insoluble. Addition of
hydrogen peroxide to the soluble complexed rare earth carbonates results in the precipitation of a series of a new compounds described as rare
earth peroxicarbonates. The rare earths have some different precipitation behavior in the carbonate–peroxide system. Some are completely and
immediately precipitated, others are completely precipitated after an aging period, and finally other are not precipitated at all. These different
behaviors open a new possibility for the separation chemistry of the rare earths. Sm, Gd, Dy, Y, Yb and Tm are fast and completely soluble in
ammonium carbonate. Ho, Eu and Tb are completely soluble in ammonium carbonate but slowly dissolved. La, Ce, Pr and Nd are only partially
soluble in ammonium carbonate. While Ce, Pr, Nd, Sm, Eu and Dy are completely and easily soluble in the ammonium carbonate plus ammonium
hydroxide mixture, La is only partially soluble and Tb is completely insoluble in the same mixture. Concerning the peroxicarbonates, La, Ce, Pr,
Nd, Sm, Eu, Gd, Dy and Ho are quantitatively precipitated. The precipitation of the Er peroxicarbonate is quantitative, but after an aging period
of 24 h. Y is not precipitated at all. The process is very easy, simple and economically attractive. Although proved in bench scale, its scale-up is
easily feasible.
Como referenciar
VASCONCELLOS, MARI E. de; ROCHA, S.M.R.; PEDREIRA, W.R.; QUEIROZ, CARLOS A. da S.; ABRAO, ALCIDIO. Solubility behavior of rare earths with ammonium carbonate and ammonium carbonate plus ammonium hydroxide: precipitation of their peroxicarbonates. Journal of Alloys and Compounds, v. 451, p. 426-428, 2008. DOI: 10.1016/j.jallcom.2007.04.163. Disponível em: http://repositorio.ipen.br/handle/123456789/5091. Acesso em: 19 Mar 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.