Precipitation studies of ammonium uranyl carbonate from UO2F2 solutions

Kan-Sen, Chou; Ding-Yi, Lin; Shieh, Mu-Chang

doi:10.1016/0022-3115(89)90246-8

Cited by 7 publications

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“…Wet deconversion involves first dissolving UF 6 into water to form a uranyl fluoride, UO 2 F 2 , solution. , The wet ammonium diuranate (ADU) route recovers U by the precipitation reaction resulting from the addition of ammonia (NH 3 ) gas or ammonium hydroxide (NH 4 OH) to UO 2 F 2 . − While commonly referred to as ADU, the actual product can be any number of compounds depending on the specific parameters used for synthesis . Similarly, the wet ammonium uranyl carbonate (AUC) route precipitates U by the addition of ammonium carbonate, (NH 4 ) 2 CO 3 , or NH 3 with carbon dioxide, CO 2 . , The dry route produces a UO 2 F 2 salt by the hydrolysis reaction of UF 6 and steam. , …”

Section: Introductionmentioning

confidence: 99%

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Identification and Elemental Impurity Analysis of Heterogeneous Morphologies in Uranium Oxides Synthesized from Uranyl Fluoride Precursors

et al. 2023

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The surface morphology characteristics of postenrichment deconversion products in the nuclear fuel cycle are important for producing nuclear fuel pellets. They also provide the first opportunity for a microstructural signature after conversion to gaseous uranium hexafluoride (UF 6 ). This work synthesizes uranium oxides from uranyl fluoride (UO 2 F 2 ) starting solutions by the wet ammonium diuranate route and a modification of the dry route. Products are reduced under a nitrogen/hydrogen atmosphere, with and without water vapor in the reducing environment. The crystal structures of the starting materials and resulting uranium oxides are characterized by powder X-ray diffraction. Scanning electron microscopy (SEM) and focused ion beam SEM with energy-dispersive X-ray spectroscopy (EDX) are used to investigate microstructural properties and quantify fluorine impurity concentrations. Heterogeneous distributions of fluorine with unique morphology characteristics were identified by backscatter electron imaging and EDX; these regions had elevated concentrations of fluorine impurities relating to the incomplete reduction of UO 2 F 2 to UO 2 and may provide a novel nuclear forensics morphology signature for nuclear fuel and U metal precursors.

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Section: Introductionmentioning

confidence: 99%

“… 6 Similarly, the wet ammonium uranyl carbonate (AUC) route precipitates U by the addition of ammonium carbonate, (NH 4 ) 2 CO 3 , or NH 3 with carbon dioxide, CO 2 . 8 , 9 The dry route produces a UO 2 F 2 salt by the hydrolysis reaction of UF 6 and steam. 2 , 10 …”

Section: Introductionmentioning

confidence: 99%