Affiliation:
1. Department of Chemical Engineering, Polytechnic School, University of Sao Paulo, Sao Paulo 05508-080, Brazil
Abstract
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.
Funder
Fundação de Amparo à Pesquisa do Estado de São Paulo and Capes
SemeAd
FIA Fundação Instituto de Administração
Cactvs Instituto de Pagamento S.A
Subject
General Materials Science,Metals and Alloys
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