Crystallization characteristics of ammonium uranyl carbonate (AUC) in ammonium carbonate solutions

Kim, Tae Joon; Jeong, Kyung-Chai; Park, Jinho; Chang, In-Soon; Cheong-Song, Choi

doi:10.1016/0022-3115(94)90268-2

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…They generally start from the precipitation of precursors in solution (e.g. hydroxides 5 , carbonates 6 , or carboxylates 7 ), which are further converted into oxides by the means of a heat treatment.…”

Section: Introductionmentioning

confidence: 99%

“…1 To overcome potential limitations due to this drawback, 2 especially during the reprocessing steps during which insoluble PuO 2 aggregates can form, 3,4 advanced fabrication schemes using wet chemistry processes have been investigated. They generally start from the precipitation of precursors in solution (e.g., hydroxides, 5 carbonates, 6 or carboxylates 7 ), which are further converted into oxides by the means of a heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Conversion of Thorium Oxalate into ThO₂·nH₂O Oxide

et al. 2020

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Hydrothermal conversion of thorium oxalate, Th(C 2 O 4) 2 .nH 2 O, into thorium dioxide was explored through a multiparametric study, leading to some guidelines for the preparation of crystallized samples with the minimum amount of impurities. As the formation of the oxide appeared to be operated through the hydrolysis of Th 4+ after decomposition of oxalate fractions, pH values typically above 1 must be considered to recover a solid phase. Also, due to the high stability of the thorium oxalate precursor, hydrothermal treatments of more than 5 hours at a temperature above 220°C were required. All the ThO 2 .nH 2 O samples prepared presented amounts of residual carbon and water in the range of 0.2-0.3 wt.% and n  0.5, respectively. Combined FTIR, PXRD and EXAFS study showed that these impurities mainly consisted in carbonates trapped between elementary nanosized crystallites, rather than substituted directly in the lattice, which generated a tensile effect over the crystal lattice. The presence of carbonates at the surface of the elementary crystallites could also explain their tendency to self-assembly, leading to the formation of spherical aggregates. Hydrothermal conversion of oxalates could then find its place in different processes of the nuclear fuel cycle, where it will provide an interesting opportunity to set up dustless routes leading from ions in solution to dioxide powders in a limited number of steps.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal Conversion of Thorium Oxalate into ThO₂·nH₂O Oxide

et al. 2020

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Carbon Dioxide as a Sustainable Reagent in Circular Hydrometallurgy

Rivera,

Binnemans

2024

ChemSusChem

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This review highlights the use of CO2 as a reagent in hydrometallurgy, with emphasis on the new concept of circular hydrometallurgy. It is shown how waste CO2 can be utilised in hydrometallurgical operations for pH control or regeneration of acids for leaching. Metal‐rich raffinate solutions generated after removal of the valuable metals can serve as feedstocks for mineral carbonation, providing alternative avenues for CO2 sequestration. Furthermore, CO2 can also be used as a renewable feedstock for the production of chemical reagents that can find applications in hydrometallurgy as lixiviant, as precipitation reagent or for pH control. Mineral carbonation can be combined with chemical reactions involving metal complexation reagents, as well as with solvent extraction processes for the concurrent precipitation of metal carbonates and acid regeneration. An outlook for future research in the area is also presented.

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Uranyl ammonium carbonate precipitation and conversion into triuranium octaoxide

Hung,

Thuan,

Thuy

et al. 2024

Heliyon

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Crystallization characteristics of ammonium uranyl carbonate (AUC) in ammonium carbonate solutions

Cited by 8 publications

References 6 publications

Hydrothermal Conversion of Thorium Oxalate into ThO₂·nH₂O Oxide

Hydrothermal Conversion of Thorium Oxalate into ThO₂·nH₂O Oxide

Carbon Dioxide as a Sustainable Reagent in Circular Hydrometallurgy

Uranyl ammonium carbonate precipitation and conversion into triuranium octaoxide

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Crystallization characteristics of ammonium uranyl carbonate (AUC) in ammonium carbonate solutions

Cited by 8 publications

References 6 publications

Hydrothermal Conversion of Thorium Oxalate into ThO2·nH2O Oxide

Hydrothermal Conversion of Thorium Oxalate into ThO2·nH2O Oxide

Carbon Dioxide as a Sustainable Reagent in Circular Hydrometallurgy

Uranyl ammonium carbonate precipitation and conversion into triuranium octaoxide

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Product

Resources

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Hydrothermal Conversion of Thorium Oxalate into ThO₂·nH₂O Oxide

Hydrothermal Conversion of Thorium Oxalate into ThO₂·nH₂O Oxide