Structure Investigation of La, Y, and Nd Complexes in Solvent Extraction Process with Liquid Phosphine Oxide, Phosphinic Acid, and Amine Extractants

氧化膦 硝酸 化学 萃取(化学) 胺气处理 溶剂萃取 磷化氢 溶剂 核化学 无机化学 有机化学 催化作用
作者
Amilton Barbosa Botelho,Natália Silva,Jorge Alberto Soares Tenório,Denise Crocce Romano Espinosa
出处
期刊:Metals [Multidisciplinary Digital Publishing Institute]
卷期号:13 (8): 1434-1434 被引量:4
标识
DOI:10.3390/met13081434
摘要

The main challenge in separating REEs through hydrometallurgical processes is their chemical similarities. Despite the literature widely presenting the possibilities for organic extractants, there is a lack of evaluation of the structures formed between the REEs and the extractants. The present study aimed to evaluate different extractants (neutral, anionic, and acid extractants) for separating La, Y, and Nd. The extraction efficiencies were evaluated, and the structure investigation was carried out in FT-IR. From the results obtained, it is clear that the extraction order is Alamine 336 <<< Cyanex 272 < Cyanex 923, where both acid extractants were more selective for Y than for La and Nd. The extraction achieved 99% at pH 5.0 in nitric acid media, and a Y/La ratio of 2 and a Y/Nd ratio of 4 using Cyanex 923. The present study also elucidated the organometallic complexation between Cyanex 923 and Cyanex 272 with Y and La, which may improve separation processes to obtain critical metals from primary and secondary sources.

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