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

Autor(es)

Botelho, Amilton Barbosa ; da Silva, Natalia Olim Martins ; Tenorio, Jorge Alberto Soares ; Espinosa, Denise Crocce Romano

• Tipo de documento: Artigo Científico
• Fonte: METALS; v. 13, n. 8, p. 16-pg., 2023-08-01.

Resumo

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. (AU)

• Processo FAPESP: 19/11866-5 - Desenvolvimento de processos inovadores para recuperação de metais críticos
• Beneficiário: Denise Crocce Romano Espinosa
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 21/14842-0 - Elucidação do mecanismo de complexação de organometálicos entre extratantes orgânicos e elementos terras raras
• Beneficiário: Amilton Barbosa Botelho Junior
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 23/01032-5 - Separação de metais críticos através de membranas suportadas com líquidos: avaliação da interação sinérgica entre organofosforados e membranas
• Beneficiário: Amilton Barbosa Botelho Junior
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado