Modelling of uranium(VI) extraction by D2EHPA/TOPO from phosphoric acid within a wide range of concentrations

Dartiguelongue, Adrien; Chagnes, Alexandre; Provost, Élise; Fürst, Walter; Cote, Gérard

doi:10.1016/j.hydromet.2015.11.007

Cited by 24 publications

(12 citation statements)

References 31 publications

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“…For the prediction of extraction, far more practical are macroscopic models based on the chemical equilibrium. 33,34 The advantage of this kind of modeling is the fact that extraction isotherms are obtained. Therefore, a potential of scale-up to chemical engineering arises.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

et al. 2019

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We propose the statistical thermodynamic model for the prediction of the liquid–liquid extraction efficiency in the case of rare-earth metal cations using the common bis(2-ethyl-hexyl)phosphoric acid (HDEHP) extractant. In this soft matter-based approach, the solutes are modeled as colloids. The leading terms in free-energy representation account for: the complexation, the formation of a highly curved extractant film, lateral interactions between the different extractant head groups in the film, configurational entropy of ions and water molecules, the dimerization, and the acidity of the HDEHP extractant. We provided a full framework for the multicomponent study of extraction systems. By taking into account these different contributions, we are able to establish the relation between the extraction and general complexation at any pH in the system. This further allowed us to rationalize the well-defined optimum in the extraction engineering design. Calculations show that there are multiple extraction regimes even in the case of lanthanide/acid system only. Each of these regimes is controlled by the formation of different species in the solvent phase, ranging from multiple metal cation-filled aggregates (at the low acid concentrations in the aqueous phase), to the pure acid-filled aggregates (at the high acid concentrations in the aqueous phase). These results are contrary to a long-standing opinion that liquid–liquid extraction can be modeled with only a few species. Therefore, a traditional multiple equilibria approach is abandoned in favor of polydisperse spherical aggregate formations, which are in dynamic equilibrium.

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Section: Introductionmentioning

confidence: 99%

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

et al. 2019

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“…Le mécanisme de l'extraction de l'uranium est alors décrit par l'équation 4. Ce mécanisme a également été établi par (Dartiguelongue et al, 2016, Ali et al, 2014, Cote et al, 2014.…”

Section: Discussionunclassified

Extraction liquide-liquide de l’uranium et de quelques métaux restrictifs issus des jus uranifères de la République du Niger par l’acide di-2-éthylhexylphosphorique et l’oxyde de trioctylphosphine

Yacouba¹,

Ibrahim²,

Mamane³

et al. 2019

Int. J. Bio. Chem. Sci

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Les sociétés uranifères du Niger utilisent l'Alamine 336 comme extractant. Toutefois, cet extractant se dégrade en amine primaire et secondaire entrainant une baisse du rendement d'extraction. L'objectif de ce travail est d'étudier l'extraction de l'uranium ainsi que certains métaux issus des jus uranifères par l'acide di-2éthylhexylphosphorique (HDEHP) et l'oxyde de trioctylphosphine (TOPO). Après extraction, le dosage des métaux a été effectué par spectrométrie d'absorption atomique pour le vanadium et le molybdène. L'uranium et le zirconium ont été analysés par spectrophotométrie UV-visible. Les meilleurs résultats d'extraction avec E > 99% d'uranium dans divers acides minéraux aux pH ≤ 1 ont été obtenus avec les systèmes TOPO/toluène/HNO 3 et HDEHP/toluène/HNO 3. L'analyse du tracé log D respectivement en fonction du pH et du log [HDEHP] du système Uranium/HDEHP a montré la formation d'un complexe de type [UO 2 (DEHP) 2 ]. La formation d'un complexe de type [UO 2 (NO 3) 2 (TOPO) 2 ] a été obtenue avec le système Uranium/TOPO. Le zirconium et le molybdène ont été extraits avec E > 50% pour tous les extractants. L'extraction du vanadium est efficace aux potentiels redox supérieurs à 800 mV. La faible formation de la 3 ème phase lors de l'extraction et l'efficacité importante d'extraction de l'uranium font du HDEHP une alternative pour ces sociétés.

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“…It appears that a good agreement between calculated and experimental data is obtained by considering the same set of extraction equilibria as for the D2EHPA/TOPO system (Figure 16). Chagnes et al [67,68] ( Figure 17).…”

Section: Insert Figure 14 Herementioning

confidence: 96%

New Insights into the Recovery of Strategic and Critical Metals by Solvent Extraction

Love¹,

Miguirditchian²,

Chagnes³

2019

Ion Exchange and Solvent Extraction: Volume 23

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1. INTRODUCTION 2. EXTRACTANT DESIGN 2.1. THE ROLE OF COORDINATION CHEMISTRY AND SUPRAMOLECULAR CHEMISTRY ON THE DESIGN OF NEW EXTRACTANTS 2.1.1. COMPLEX FORMATION 2.1.2. ION PAIRS AND METALATES 2.1.3. REVERSE MICELLES 2.1.4. CONCLUSION 2.2. THE ROLE OF PHYSICOCHEMISTRY FOR A RATIONAL DESIGN OF NEW EXTRACTANTS 2.3. CASE STUDIES 2.3.1. DESIGN OF NEW EXTRACTANTS FOR URANIUM RECOVERY FROM WET PHOSPHORIC ACID 2.3.2. CHEMICAL DESIGN IN GOLD RECOVERY BY URBAN MINING 3. FLOWSHEET OPTIMIZATION 3.1. EFFECT OF FLOWRATES ON FLOWSHEET PERFORMANCES 3.2. INFLUENCE OF DEGRADATION ON FLOWSHEET PERFORMANCE 3.3. COMBINING CHEMISTRY AND ENGINEERING FOR FLOWHEET OPTIMIZATION 3.4. PERSPECTIVE IN THE DEVELOPMENT OF TOOLS FOR FLOWSHEET OPTIMIZATION 4. CONCLUSION 5. REFERENCES

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Modelling of uranium(VI) extraction by D2EHPA/TOPO from phosphoric acid within a wide range of concentrations

Cited by 24 publications

References 31 publications

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

Extraction liquide-liquide de l’uranium et de quelques métaux restrictifs issus des jus uranifères de la République du Niger par l’acide di-2-éthylhexylphosphorique et l’oxyde de trioctylphosphine

New Insights into the Recovery of Strategic and Critical Metals by Solvent Extraction

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