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

Olivia Pecheur 1, 2, 3, 4, 5
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.
Complete list of metadatas

Cited literature [77 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01225881
Contributor : Abes Star <>
Submitted on : Saturday, November 7, 2015 - 1:01:10 AM
Last modification on : Monday, May 6, 2019 - 2:22:02 PM
Long-term archiving on : Monday, February 8, 2016 - 10:55:35 AM

File

2015VERS0031.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01225881, version 1

Citation

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⟩

Share

Metrics

Record views

434

Files downloads

1595