Compréhension des mécanismes synergiques pour l'extraction de l'uranium des mines de phosphates

Olivia Pecheur 1, 2, 3, 4, 5
1 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
2 LILA - Laboratory of Interactions Ligand-Actinide
DMRC - Département de recherche sur les procédés pour la mine et le recyclage du combustible : DEN/DMRC
4 L2IA - Ions aux Interfaces Actives
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
5 LTSM - Tri ionique par les Systèmes Moléculaires auto-assemblés
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
Abstract : Uranium VI is commonly extracted from phosphoric ores by a well-known process exploiting the synergistic mixture of two extractant molecules : HDEHP and TOPO. In the field of liquid-liquid extraction, synergistic combinations are common but the mechanisms at the origin of the synergy are not well understood. A multi-scale approach has been used to describe these mechanisms, combining two different descriptions : the molecular scale focuses on the ion point of view, while the supramolecular scale focuses on extractants' aggregation. These two approaches have been rationalized by molecular dynamics computations. The results allow describing the synergy through the structure of the complexes and aggregates. With the same approach, some bifunctional compounds, combining the two extracting sites in one molecule, have been studied and compared to the HDEHP/TOPO system in order to identify the origin of their increased capacities in extraction and selectivity.
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Olivia Pecheur. Compréhension des mécanismes synergiques pour l'extraction de l'uranium des mines de phosphates. Chimie analytique. Université de Versailles-Saint Quentin en Yvelines, 2014. Français. ⟨NNT : 2014VERS0031⟩. ⟨tel-01225881⟩

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