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Extraction of Lanthanides(III) by a Mixture of a Malonamide and a Dialkyl Phosphoric Acid

Abstract : Several hydrometallurgical processes studied in France for lanthanide/minor actinide separation use a combination of DMDOHEMA and HDEHP as extractants. Although these processes have proved to be reliable, the modeling of their extraction properties remains a difficult task due to a lack of knowledge about the behavior of the mixed DMDOHEMA-HDEHP organic phase. In the present work, it was found that the solvent extraction of Ln(III) ions by a mixture of these extractants exhibits a complex behavior involving a synergistic effect at either 1 M HNO3 or high metal concentration, and an antagonistic effect on extraction of metal traces at higher pH (> 2). To understand these effects, Ln(III) complexes formed after extraction by DMDOHEMA and/or HDEHP were characterized by several spectroscopic techniques (FT-IR, UV-Vis, ESI-MS, TRLIFS). Results suggested formation of DMDOHEMA-HDEHP adducts and ternary mixed complexes involving both extractants and possibly a nitrate ion.
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https://hal-cea.archives-ouvertes.fr/cea-02383809
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Submitted on : Thursday, November 28, 2019 - 8:38:56 AM
Last modification on : Wednesday, October 14, 2020 - 3:43:15 AM

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Julie Muller, Claude Berthon, Laurent Couston, Nicole Zorz, Jean-Pierre Simonin, et al.. Extraction of Lanthanides(III) by a Mixture of a Malonamide and a Dialkyl Phosphoric Acid. Solvent Extraction and Ion Exchange, Taylor & Francis, 2016, 34 (2), pp.141-160. ⟨10.1080/07366299.2015.1135030⟩. ⟨cea-02383809⟩

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