Preparation and properties of the violet “U3O8 hydrate”

Cordfunke, E.H.P.; Prins, G.; Vlaanderen, P. van

doi:10.1016/0022-1902(68)80348-3

Cited by 13 publications

(10 citation statements)

References 2 publications

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“…The sample that was examined by AEM may therefore have been partially oxidized to a schoepite type phase between the time the test was terminated and the sample was analyzed. In addition to the potential for oxidation, dehydration in the vacuum chamber during analysis could lead to structural rearrangement in the crystals [15]. Finally, there is limited amount of information on atomic parameters of ianthinite for the computer simulations.…”

Section: Resultsmentioning

confidence: 99%

Incorporation of cerium and neodymium in uranyl phases

Kim

Wronkiewicz

Finch

et al. 2006

Journal of Nuclear Materials

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Section: Resultsmentioning

confidence: 99%

Incorporation of cerium and neodymium in uranyl phases

Kim

Wronkiewicz

Finch

et al. 2006

Journal of Nuclear Materials

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“…Crystallization requires prolonged (one week) treatment of the slurry at boiling temperatures in the absence of dissolved oxygen. It was also noted in the literature that the presence of oxidized uranium in the precipitate inhibits the conversion of U308-nH20 and UOrnH20 to their crystalline forms (Gmelin 1978;Cordfunke et al 1968). Freshly precipitated Tc(IV) hydroxide also is amorphous (Spitsyn and Kuzina 1981) and would not be observed by x-ray diffraction.…”

Section: 4mentioning

confidence: 97%

“…The latter compound is poorly investigated in alkaline media (Gmelin 1978; Cordfunke et al 1968). However; its ability to coprecipitate plutonium and other actinides in different valent states from neutral solutions recently was predicted by comparison of its crystal structure to the mineral ianthinite [U02-5(UO~).lOH20] and the closeness of the ionic radii of U(IV,V, and VI) to those of the other actinides (Burns et al 1997).…”

Section: 1mentioning

confidence: 99%

“…U02.8~nH20 (Cordfunke et al 1968;Gmelin 1978). Uranium is present in both (VI) and (IV) oxidation states in the natural mineral ianthinite (Gmelin 1978).…”

Section: 2mentioning

confidence: 99%

“…The absence in the reaction products of any crystalline forp of reduced uranium produced by sodium uranate reaction with hydrazine may be expected based on literature data. Both U308-nH20 and UOrnH20 will precipitate from U(VI) solutions as amorphous solids (Gmelin 1978;Cordfunke et al 1968). Crystallization requires prolonged (one week) treatment of the slurry at boiling temperatures in the absence of dissolved oxygen.…”

Section: 4mentioning

confidence: 99%

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Purification of alkaline solutions and wastes from actinides and technetium by coprecipitation with some carriers using the method of appearing reagents: Final Report

Peretrukhin¹,

Silin²,

Kareta³

et al. 1998

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The coprecipitation of transuranium elements and technetium from alkaline solutions and from simulants of Hanford Site tank wastes has been studied in reducing and oxidizing conditions on uranium(IV,vT) hydroxocompounds, tetraakylammonium perrhenate and perchlorate, and on hydroxides of Fe(m), Co(III), Mn(II), and C r o using the Method of Appearing Reagents (MAR). Coprecipitations in alkaline solution have been shown to give high decontamination factors (DF) at low content of carrier and in the presence of high salt concentrations.Uranium(IV) hydroxide in concentrations higher than 3~1 0 -~ M coprecipitates Pu and Cm in any oxidation state from 0.2 to 4 M NaOH with DFs of 110 to lo00 and Np and Tc with DFs of 51 to 176. UraniumCvI), introduced as a sodium uranate precipitate or the soluble peroxocomplex salt NaUO2(02)3, can be partially reduced in 0.2 to 2 M NaOH by hydrazine to U30~.nH20 in the presence of (1 to 5 )~1 0 -~ M Tc(VII). The Tc(VlI) is first reduced to Tc(IV). The product U308.nH20, at 0.012 to 0.05 M uranium, coprecipitates Np, Pu, Cm, and Tc in any oxidation state with DFs greater than 100 from 0.2 to 1.5 M NaOH. Increasing alkali concentration to 4 M NaOH decreases the DFs slightly for TRU and drastically for Tc. Coprecipitation under the same conditions from simulated tank waste containing 3.2 M NaOH, 0.04 M C1-05-and 11 complex-forming salts yields the following DFs: Np-12, Pu-27, Cm-35, Tc-3. The decrease of DFs in the waste simulant is associated with complex formation and with inhibition of Np and Tc coprecipitation by the Cr(m) hydroxide that is formed before Np(IV) and Tc(IV). Coprecipitated Tc may be effectively leached from U30p-nH20 by oxidation of Tc(IV) to Tc(VII) by use of dilute H202 or by NaOH solution and air bubbling. Under these same conditions, more than 99% of the Pu is retained in the solid phase. iii

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Physical and Chemical Properties of Uranium

Gindler¹

1973

Uranium · Plutonium Transplutonic Elements

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Preparation and properties of the violet “U3O8 hydrate”

Cited by 13 publications

References 2 publications

Incorporation of cerium and neodymium in uranyl phases

Incorporation of cerium and neodymium in uranyl phases

Purification of alkaline solutions and wastes from actinides and technetium by coprecipitation with some carriers using the method of appearing reagents: Final Report

Physical and Chemical Properties of Uranium

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