Separation of transition metals from rare earths by non-aqueous solvent extraction from ethylene glycol solutions using Aliquat 336

Li, Zheng; Li, Xiaohua; Raiguel, Stijn; Binnemans, Koen

doi:10.1016/j.seppur.2018.03.022

Cited by 63 publications

(45 citation statements)

References 37 publications

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“…A few preliminary studies explored utilization of some polar organic solvents to replace water in the MP phase for metal extractions; however, no superior metal separations were observed . Recently, extraction of rare earth elements and transition metals from ethylene glycol (EG) solutions showed higher extraction efficiency and higher separation factors compared to the extraction from aqueous solutions . These results clearly indicate that EG affects the extraction of metals differently than water.…”

Section: Figurementioning

confidence: 99%

“…[14][15][16][17][18] Recently, extractiono fr are earth elements and transition metals from ethylene glycol (EG) solutions showed higher extraction efficiency and highers eparation factors comparedt ot he extraction from aqueous solutions. [19][20][21] These results clearly indicatet hat EG affectst he extraction of metals differently than water.N evertheless,h ow these polar solvents (water and EG) affect metal extraction is not clear yet, and the possibility of using other polar solvents, besides EG, to enhancem etal separations remains unknown. Herein, we propose am echanism on how polar solvents affect metal extraction and demonstrate that metal separations can be dramatically improved by using suitable polar solvents.…”

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confidence: 99%

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Enhancing Metal Separations by Liquid–Liquid Extraction Using Polar Solvents

Zhang

Smolders

et al. 2019

Chemistry A European J

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The less polar phase of liquid–liquid extraction systems has been studied extensively for improving metal separations; however, the role of the more polar phase has been overlooked for far too long. Herein, we investigate the extraction of metals from a variety of polar solvents and demonstrate that, the influence of polar solvents on metal extraction is so significant that extraction of many metals can be largely tuned, and the metal separations can be significantly enhanced by selecting suitable polar solvents. Furthermore, a mechanism on how the polar solvents affect metal extraction is proposed based on comprehensive characterizations. The method of using suitable polar solvents in liquid–liquid extraction paves a new and versatile way to enhance metal separations.

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Section: Figurementioning

confidence: 99%

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confidence: 99%

Enhancing Metal Separations by Liquid–Liquid Extraction Using Polar Solvents

Zhang

Smolders

et al. 2019

Chemistry A European J

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“…Organophosphorus extractants and quaternary ammonium bases (QABs) are some of the most studied extractants in hydrometallurgy [15]. In particular, in the treatment and separation of f-elements tri-n-butyl-phosphate (TBP) [16][17][18], soluble in organic phases phosphoric acids [19][20][21][22], and mixtures of QABs [23][24][25] are widely used.…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Didymium by TBP, Aliquat 336 and HDEHP in The Presence of Ca(NO3)2

Matveev¹,

Петров²

2020

Applied Sciences

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Three commercially available extractants (tri-butyl-phosphate (TBP), di-(2-ethylhexyl)phosphoric acid (HDEHP) and Aliquat 336 (a mixture of quaternary ammonium bases)) were tested for separation of Pr(III) and Nd(III) in both static and dynamic modes. In the case of HDEHP, phase stability and influence of nitric acid were considered. Extraction isotherms were constructed, and influence of water-soluble complexing agents on the separation factor was investigated for Aliquat 336. In the case of TBP, influence of calcium nitrate in aqueous phase on the extraction efficiency was investigated. Model countercurrent experiments were conducted for TBP and Aliquat 336. It was shown that TBP is the best choice due to its high capacity and cation extraction order (Nd > Pr).

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“…In this case though,t he aqueous phase is replacedb yanonaqueoussolvent. [17,18] Although thesep rocesses can be carriedo ut easily on al aboratory scale, on an industrial scale they may be challenging and several conditions should be fulfilled. [5,19] Amongt hose,i n solvent extraction the transition region between the immiscible liquid phases is of paramount importance,a si tc an either facilitateo rh indert he migration of the target compound betweenthe phases and even increase or decreasethe selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…As in hydrometallurgy, also in solvometallurgy conventional solvent extraction is used. In this case though, the aqueous phase is replaced by a nonaqueous solvent [17, 18] …”

Section: Introductionmentioning

confidence: 99%

Understanding the Complex Surface Interplay for Extraction: A Molecular Dynamics Study

Macchieraldo

Ingenmey

Kirchner

2020

Chemistry A European J

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By means of classical molecular dynamics simulation the interfacial properties of methanola nd n-dodecane, which are two potential candidate solvents for use in nonaqueous liquid-liquid extraction, were assessed. The question of how the interface changes dependingo nt he concentration of extractant(tri-n-butyl phosphate) and salt (LiCl) is addressed. Twod ifferent models to represent systems were used to evaluateh ow LiCl and tri-n-butyl phosphate affect mutual miscibility,a nd how the last-named behaves depending on the chemical environment. Tri-n-butylp hosphate increases the mutual solubility of the solvents, whereas LiClc ounteracts it. The extractant was found to be mostly adsorbed on the interface between the solvents, and therefore the structural features of the adsorption were investigated.A dsorption of tri-n-butyl phosphate changes depending on its concentration and the presence of LiCl. It exhibits ap referentialo rientation in which the butylc hains point at the n-dodecanep hase and the phosphate group points at the methanol phase. For high concentrations of tri-n-butyl phosphate, its molecular orientation is preserved by diffusion of the excess molecules into both the methanola nd ndodecane phases. However,L iCl hinders the diffusion into the methanolp hase, and thus increasest he concentration of tri-n-butyl phosphate at the interface and forces ar earrangement with subsequent loss of orientation.

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Separation of transition metals from rare earths by non-aqueous solvent extraction from ethylene glycol solutions using Aliquat 336

Cited by 63 publications

References 37 publications

Enhancing Metal Separations by Liquid–Liquid Extraction Using Polar Solvents

Enhancing Metal Separations by Liquid–Liquid Extraction Using Polar Solvents

Solvent Extraction of Didymium by TBP, Aliquat 336 and HDEHP in The Presence of Ca(NO3)2

Understanding the Complex Surface Interplay for Extraction: A Molecular Dynamics Study

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