Extraction of Lanthanides(III) by a Mixture of a Malonamide and a Dialkyl Phosphoric Acid. Issue 2 (23rd February 2016)

• Record Type: Journal Article
• Authors: Muller, Julie M.; Berthon, Claude; Couston, Laurent; Zorz, Nicole; Simonin, Jean-Pierre; Berthon, Laurence
• Is Part Of: Solvent extraction and ion exchange. Volume 34:Issue 2(2016)
• Page Start: 141
• Page End: 160
• Publication Date: 2016-02-23
• Subjects: Malonamide -- dialkyl phosphoric acid -- lanthanides -- liquid-liquid extraction -- mass spectrometry -- UV-visible -- FTIR -- TRLIFS -- DIAMEX-SANEX process; Solvent extraction -- Periodicals; Ion exchange -- Periodicals; 660.284248
• DOI: 10.1080/07366299.2015.1135030
• Languages: English
• ISSNs: 0736-6299

Abstract

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.