Solvent extraction studies on uranium using amine based extractants and recovery from low grade ore leach liquors

Abstract

Neste estudo, extratores à base de amina (Alamine 336, Alamine 308, Alamine 304 e Aliquat 336) diluídos em querosene foram usados para extração de urânio e separação de outros elementos associados. Alamine 336 foi o melhor extrator para o processo de extração de urânio de soluções de sulfato quando comparado com outros reagentes à base de amina, Alamine 308, 304 Alamine 336 e Aliquat 336. O comportamento da extração sinérgica foi estudado com aminas como extratantes assim como reagentes sinergistas e organofosforados usados em misturas sinergistas com aminas. Os estudos de extração sinérgica com aminas não foram adequados entre si para melhor eficiência da extração. No entanto, aminas misturadas com extratores organofosforados forneceram comportamento sinérgico positivo, com um coeficiente de 0,567, calculado a partir de resultados obtidos. A metodologia desenvolvida foi aplicada ao processamento de minério de baixo grau de urânio, e 99,83% de urânio foi recuperado sem interferências de outros metais.In this study, amine based extractants (Alamine 336, Alamine 308, Alamine 304 and Aliquat 336) diluted in kerosene were used as promising extractants for uranium extraction and separation from other associated elements. Alamine 336 was the best extractant for uranium extraction process from sulfate solutions when compared with other amine based extractants, Alamine 308, Alamine 304 and Aliquat 336. Synergistic extraction behavior was studied with amines as extractants as well as synergists and organophosphorus reagents used as synergist mixed with amines. Synergistic extraction studies with amines were not suitable with each other for better extraction efficiency. However, amines mixed with organophosphorus extractants gave positive synergetic behavior with the highest synergistic coefficient 0.567 calculated from results obtained. The developed methodology was applied to uranium low grade ore processing and 99.83% of uranium was recovered without the interferences of other metals.

Effect of the Addition of Amine in Organophosphorus Compounds on Molecular Structuration of Ionic Liquids–Application to Solvent Extraction

“…Synergistic effects were also reported by mixing amine and organophosphorus acid [7][8][9][10][11][12][13]. For instance, Liu et al [10] showed synergistic extraction of rare-earth elements (REE) by mixing organophosphorus compounds such as Cyanex 272 (bis(2,4,4-trimethylpentyl)phosphinic acid), PC88A (2-ethylhexyl-2-ethylhexyl phosphonic acid) or D2EHPA (bis(2-ethylhexyl)phosphoric acid) with Alamine 336 (a blend of octyl and decyl tertiary amines).…”

Separation of Uranium(VI) and Vanadium(V) from Sulfuric Acid Media by Amine Based Extractants through Liquid-liquid Extraction Technique#

“…The extraction behavior of new bi-functional ligands containing sulfur and amide groups towards the U(VI) ion from nitric acid was studied and reported [19][20][21][22][23][24] . Other reports are related to P based extractants used for U extraction [25][26][27][28][29] and our previous extraction studies on U extraction was developed and reported [30][31][32][33] .…”

Organic solvent extraction of uranium from alkaline nuclear waste

“…Kim et al [8] investigated solvent extraction of uranium using amine based extractants. Amine based extractants such as, Alamine 336, Alamine 308, Alamine 304 and Aliquat 336 in diluent kerosene were investigated.…”