Recovery of uranium (VI) from concentrated phosphoric acid using bifunctional reagents

Leydier, Antoine; Arrachart, Guilhem; Turgis, Raphaël; Bernier, Gilles; Marie, Cécile; Miguirditchian, Manuel; Pellet‐Rostaing, Stéphane

doi:10.1016/j.hydromet.2017.05.008

Cited by 12 publications

(6 citation statements)

References 24 publications

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“…One of the first examples studied was proposed by Warshawsky et al using a O-methyldihexylphosphine oxide O ′ -hexyl-2-ethyl phosphoric acid however a third-phase formation occurs during the extraction (Figure 9a) [75]. In a comparable approach, molecules that contain a phosphoric acid group, similar to HDEHP, and a phosphine oxide group, similar to TOPO, have been described (Figure 9b) [77].…”

Section: Research On New Extractants For Uranium Extraction From Phos...mentioning

confidence: 98%

Solvent extraction of uranium from an acidic medium for the front-end of nuclear fuel cycle: from mechanisms understanding to innovative process design

Giusti,

Guerinoni,

Lemire

et al. 2024

Comptes Rendus. Chimie

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Despite the fact that methods for uranium extraction from an acidic medium (sulfuric, phosphoric or nitric) are relatively robust processes, the search for more efficient systems in terms of extraction efficiency and selectivity with respect to competitor ions remains relevant. To address this challenge, researchers have developed a wide range of new extracting molecular agents that allow efficient and selective liquid-liquid extraction of the target metal. After delivering a synoptic reminder of the former hydrometallurgical processes on which dogmas have been based, we present an exhaustive report of the structures that have been designed, synthesized and evaluated as useful hydrometallurgical tools for the extraction of uranium focused on the front-end of the nuclear fuel cycle. Moreover, peculiar emphasis has been given to theoretical aspects related to parameters, such as amphiphilic properties, which influence the extraction mechanism involved in each system, be it mono-or multifunctional ligand. Concluding remarks were afforded as consistent milestones of a prospective and promising route for the next hydrometallurgy including the influence of the stereochemistry.

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Section: Research On New Extractants For Uranium Extraction From Phos...mentioning

confidence: 98%

Solvent extraction of uranium from an acidic medium for the front-end of nuclear fuel cycle: from mechanisms understanding to innovative process design

Giusti,

Guerinoni,

Lemire

et al. 2024

Comptes Rendus. Chimie

Self Cite

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“…Some derivatives have shown to be even more efficient than the reference HDEHP/ TOPO synergistic system for uranium extraction from phosphoric acid solution. 7,8 The most efficient bifunctional molecules incorporate an amide and a phosphonic acid group; butyl-N,N-di(2-ethylhexyl)carbomoyl-nonylphosphonate denoted as DEHCNPB (Figure 1) exhibits outstanding extraction properties with a high extraction efficiency toward U(VI) and a high selectivity toward impurities. 7,9 For both synergistic and bifunctional systems, the addition of a neutral extractant group to the acidic function has a remarkable effect on extraction properties.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Such bifunctional molecules have been developed for uranium extraction. Some derivatives have shown to be even more efficient than the reference HDEHP/TOPO synergistic system for uranium extraction from phosphoric acid solution. , The most efficient bifunctional molecules incorporate an amide and a phosphonic acid group; butyl- N , N -di(2-ethylhexyl)carbomoyl-nonylphosphonate denoted as DEHCNPB (Figure ) exhibits outstanding extraction properties with a high extraction efficiency toward U(VI) and a high selectivity toward impurities. , …”

Section: Introductionmentioning

confidence: 99%

Aggregation of Bifunctional Extractants Used for Uranium(VI) Separation

et al. 2021

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DEHCNPB (butyl-N,N-di(2-ethylhexyl)carbamoyl-nonylphosphonate) is an amido-phosphonic acid that has remarkable properties for the separation of uranium from wet phosphoric acid. Despite previous studies, a detailed description of the DEHCNPB organic solutions at the supramolecular and molecular scales is missing. In the present work, we use classical Molecular Dynamics (MD) combined with SANS and SAXS experimental data in order to describe the aggregation of the bifunctional extractant DEHCNPB as well as the speciation of uranium(VI) in such systems. We provide a fine description of the molecular species in the organic solution and of the interactions within the aggregates formed, shedding light on solvent extraction mechanisms. Without uranium, the organic phase is highly composed of dimers and trimers H-bonded through phosphonate functions and without water molecules. With uranium, two to three extractant molecules coordinate directly the uranyl cation by their phosphonate groups. Uranyl is not fully dehydrated in this organic solution, and the amide groups of the extractants are found to form H-bonds with the water molecules bound to uranyl. These H-bond networks around the metallic cation stabilize the complexes and facilitate the extraction. These results underline the importance of considering weak interactions in the understanding of extraction processes and demonstrate how molecular simulations provide essential insights into such complex organic phase chemistry with a high number of species.

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“…[14] N,P bifunctional extractants such as carbamoylalkylphosphonates involving an amido and a phosphorus functionality and especially the butyl-1-[N,N-bis(2-ethylhexyl)carbamoyl]nonyl phosphonic acid, called DEHCNPB, have shown unprecedented extraction properties for uranium from phosphoric media. [15][16][17][18][19] So far, DEHCNPB efficiency has never been evaluated for uranium extraction from nitric media, and the patented N, P bifunctional family has not been investigated in the literature for this media. In the present study, two amidophosphonates, are therefore studied and compared to both DEHCNPB and TBP as reference extractants.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Amidophosphonate Molecules for Uranium Extraction in Nitrate Acidic Media

Artese

Dourdain

Felines

et al. 2020

Solvent Extraction and Ion Exchange

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Bifunctional amidophosphonate derivatives, already known as efficient ligands in uranium extraction from phosphoric media, have been evaluated and compared to the conventional trin-butyl phosphate (TBP) for uranium extraction from nitric medium. The efficiency of U extraction and its selectivity towards competing elements such as Th, Zr, Mo, Fe and V was evaluated with various ligand structures. It was found that extractant molecules containing a monosaponified phosphonate moiety instead of phosphonate moieties are less effective and selective. Furthermore, it was observed that alkylation of the methylene bridge linking the two functional groups prevent the formation of precipitates during the uranium loading. Effects of acidity as well as ligand concentration were also investigated to estimate the loading capacity of the molecules. More detailed stoichiometry and transfer energy were further determined by the slope analysis method and a thermodynamic study. The possible uranium recovery from the organic phase has finally been demonstrated thanks to stripping steps at low nitric acid concentration.

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Recovery of uranium (VI) from concentrated phosphoric acid using bifunctional reagents

Cited by 12 publications

References 24 publications

Solvent extraction of uranium from an acidic medium for the front-end of nuclear fuel cycle: from mechanisms understanding to innovative process design

Solvent extraction of uranium from an acidic medium for the front-end of nuclear fuel cycle: from mechanisms understanding to innovative process design

Aggregation of Bifunctional Extractants Used for Uranium(VI) Separation

Bifunctional Amidophosphonate Molecules for Uranium Extraction in Nitrate Acidic Media

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