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AbstractAbstract
[en] The present work is devoted to the fixation of uranium (VI) on the conventional anion-exchange resin Dowex 2 X 8 in carbonate and hydrogen-carbonate media. Both media were successfully used for the recuperation of uranium (VI) from very dilute solutions. Equilibrium constant of the exchange [UO2(CO3)34+]S + 2 [CO32-]R ↔ [UO2(CO3)34-]R + 2[CO32-]S is determined for carbonate concentration range 0.1 M to 0.6 M from partition curves. A markedly increase in the relative fixation of uranium results with: - increasing free carbonate concentration of the solution, - decreasing uranium concentration. A study in the same conditions of the fixation of molybdenum has made it possible to separate the latter from uranium by elution, the carbonate concentration being molar. It is suggested a possibility of separation on a larger scale, based upon molybdenum displacement by uranium in hydrogen-carbonate medium. (author)
[fr]
Le present travail precise la fixation de l'uranium (VI) sur la resine echangeuse d'anions Dowex 2 X 8, en milieu carbonate et hydrogeno-carbonate. Nous en avons deduit que ces deux milieux sont egalement favorables a la recuperation de l'uranium a partir de solutions tres diluees. La constante d'equilibre de la reaction d'echange [UO2(CO3)34+]S + 2 [CO32-]R ↔ [UO2(CO3)34-]R + 2[CO32-]S a ete determinee pour le milieu carbonate 0.1 M a 0.6 M, a partir deb courbes de partage. La fixation relative de l'uranium augmente considerablement lorsque: - la concentration du carbonate libre (respectivement hydrogenocarbonate) diminue, - la concentration de l'uranium en solution diminue. Le comportement du molybdene a ete etudie en vue de la separation uranium-molybdene. L'ion fixe sur la resine est l'ion molybdate MoO42-. La separation est possible en milieu carbonate 1 M sur de petites quantites, en utilisant la technique de l'elution. Il est suggere une possibilite de separation a une echelle plus importante basee sur le deplacement du molybdene par l'uranium en milieu hydrogenocarbonate 0.5 M (le rapport des coefficients de selectivite est alors tres grand). (auteur)Original Title
Etude des solutions d'uranium (VI) en milieu carbonate par titrages potentiometriques et echange d'ions
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Source
Apr 1968; [99 p.]; 52 refs.; These Docteur Es-Sciences appliquees
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Report
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Thesis/Dissertation
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ACTINIDE COMPOUNDS, ACTINIDES, ALKALI METAL COMPOUNDS, CARBON COMPOUNDS, CARBONATES, CHEMICAL ANALYSIS, CHEMICAL REACTIONS, DECOMPOSITION, DISSOLUTION, ELEMENTS, LYSIS, MATERIALS, METALS, MOLYBDENUM COMPOUNDS, NITRATES, NITROGEN COMPOUNDS, ORGANIC COMPOUNDS, ORGANIC POLYMERS, OXYGEN COMPOUNDS, PETROCHEMICALS, PETROLEUM PRODUCTS, POLYMERS, QUANTITATIVE CHEMICAL ANALYSIS, REFRACTORY METAL COMPOUNDS, REFRACTORY METALS, SEPARATION PROCESSES, SODIUM COMPOUNDS, SOLVOLYSIS, TITRATION, TRANSITION ELEMENT COMPOUNDS, TRANSITION ELEMENTS, URANIUM COMPOUNDS, URANYL COMPOUNDS, VOLUMETRIC ANALYSIS
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