The infra-red spectra and structures of some hydrated uranium trioxides and ammonium diuranates

Deane, A.M.

doi:10.1016/0022-1902(61)80298-4

Cited by 51 publications

(12 citation statements)

References 6 publications

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“…At 600°C, a strong band appeared at 800 cm −1 due to the asymmetric stretching frequency of the uranyl group of U 3 O 8 . These TGA/DTA and IR spectroscopy results are consistent with the results of previous research reported in the literature (Cordfunke and Aling, 1963;Deane, 1961;Hoekstra and Siegel, 1961;Sato, 1976;Singh et al, 2004;Varga et al, 2011). All of the results of the studies of the other precipitates obtained under different conditions were similar to those previously described, although they are not presented in this paper.…”

Section: Properties Of Uranium Peroxidesupporting

confidence: 93%

Uranium stripping from tri-n-butyl phosphate by hydrogen peroxide solutions

et al. 2013

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a b s t r a c t a r t i c l e i n f oThe processes of uranium stripping from 30% tri-n-butyl phosphate (TBP) in "odorless" kerosene by H 2 O 2 solutions both with and without NH 4 OH added were investigated in the temperature range of 20-50°C and with a volumetric ratio of 1 between the organic and aqueous phases. The uranium was selectively precipitated in the form of uranium peroxide during stripping from the organic phase by hydrogen peroxide. The stripping of uranium increased with increasing H 2 O 2 content, increasing temperature and increasing concentration of NH 3 in the range of 0-15 g/L. The use of a heated solution (40°C) that contained 4 mol H 2 O 2 /mol U and NH 3 12 g/L resulted in 99.7% of the uranium being stripped from TBP in the form of uranium peroxide. The uranium peroxide obtained by stripping is a highly pure product that exists in two different hydrated forms: UO 4 •4H 2 O (92 mass %) and UO 4 •2H 2 O. The mean particle diameter was 20.75 μm. The effect of hydrogen peroxide on the organic phase was studied by IR spectroscopy. No structural changes in TBP were observed after 30 cycles of extraction/stripping; thus, the use of hydrogen peroxide in this application is unrestricted.

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Section: Properties Of Uranium Peroxidesupporting

confidence: 93%

Uranium stripping from tri-n-butyl phosphate by hydrogen peroxide solutions

et al. 2013

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“…The infrared spectra of U0 3 phases have been studied by several investigators [2][3][4][5][6][7][8][9][10][11][12][13][14][15], Although the spectra were similar, these workers differed in their interpretation and assignment of the observed bands. In particular HOEKSTRA and SIEGEL [2] observed two absorption bands in the uranyl region which are indicative of symmetric (i^s = 860 cm" 1 ) and asymmetric (v" = 930 cm" 1 ) vibrations.…”

Section: Introductionmentioning

confidence: 96%

Infrared Absorption Study of Uranium Trioxide Phases

Khilla¹,

El-Fekey²,

Rofail³

1986

Radiochimica Acta

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“…There is some disagreement over the formulation of the precipitate obtained when uranyl nitrate is contacted with aqueous ammonia [3,4,5] but the notation used by CORDFUNKE [5] is convenient to use and is adopted in this paper. Cordfunke identified four Compounds in the system NH3 -UO3 -H2O in equilibrium with aqueous solutions at 40"'C, which can be represented by UO3 • ;CNH3 •(2-X) H2O, in which x can have values 0, 0.33, 0.5 and 0.67, corresponding to Compounds labelled I, II, III and IV, respectively.…”

Section: Ammonium Uranate (Au)mentioning

confidence: 99%

Basic Aspects of the Get-Precipitation Route to Nuclear Fuel

et al. 1984

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Gel precipitation IPolyacrylamide /Fast reactor fuel /Mixed actinide oxides /Ammonium uranate/Gel structure SummaiyThe physical and chemical changes invoWed in the foimation of spherical particles of (U,Th)Oj and (U, 30% Pu)Oj by a gel piecipitation loute aie desciibed, with emphasis being placed on the role of the polymer. In addition to Controlling the overall shape of the gel particle, the polymer is found to control the internal structure through the formation of bonds with ammonium uranate and other hydrous metal oxides in the precipitated gel. A common unit of structure is observed over the ränge of (U, Th) compositions studied and for the (U, 30% Pu) system. Removal of the polymer can be achieved without any significant disruption of the structure.

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The infra-red spectra and structures of some hydrated uranium trioxides and ammonium diuranates

Cited by 51 publications

References 6 publications

Uranium stripping from tri-n-butyl phosphate by hydrogen peroxide solutions

Uranium stripping from tri-n-butyl phosphate by hydrogen peroxide solutions

Infrared Absorption Study of Uranium Trioxide Phases

Basic Aspects of the Get-Precipitation Route to Nuclear Fuel

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