Synergistic extraction and separation of yttrium from heavy rare earths using mixture of sec-octylphenoxy acetic acid and bis(2,4,4-trimethylpentyl)phosphinic acid

Sun, Xiaoxin; Zhao, Junmei; Meng, Shulan; Li, Deqian

doi:10.1016/j.aca.2004.11.005

Cited by 109 publications

(55 citation statements)

References 11 publications

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“…The aqueous solutions of Dy (4.31×10 −3 mol L −1 ) were used for the extraction studies. The synergistic enhancement factor (R) could be obtained based on the experimental data [24],…”

Section: Solvent Extraction Studiesmentioning

confidence: 99%

“…In the synergistic extraction, mixtures of two different extractants enhance the extraction of a metal as compared with the normal additive effect of these extractants separately [8]. Many authors reported the synergistic solvent extraction systems for extracting and separating rare earths using acidic, neutral and solvating extractants [9][10][11][12][13][14][15][16], but in the case of liquid membrane, there are limited number of investigations devoted to the synergistic extraction of rare earth elements. Synergistic effect between Cyanex272 and TBP was observed in the separation of yttrium ions from the mixture of rare earths by a microporous hydrophobic hollow fiber supported liquid membrane [17].…”

Section: Introductionmentioning

confidence: 99%

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Synergistic extraction and separation of Dysprosium and Europium by supported liquid membrane

Zaheri

Abolghasemi

Mohammadi

et al. 2015

Korean J. Chem. Eng.

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Synergistic extraction and separation of Dysprosium (Dy) and Europium (Eu) via supported liquid membrane (SLM) were investigated using mixture of di-2-ethylhexyl phosphoric acid (D2EHPA) and Bis (2,4,4-trimethylpentyl) phosphinic acid (Cyanex272). The results showed that separation of Dy and Eu was highly dependent on the pH of feed solution. Dy can be extracted more than Eu, because the equilibrium constant for Dy using the mixture of D2EHPA and Cyanex272 was greater than that for Eu. Various parameters were optimized to achieve maximum separation factor, namely feed phase pH, carrier concentration and stripping phase concentration. The membrane was stable at six cycles of operation.

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“…The aqueous solutions of Dy (4.31×10 −3 mol L −1 ) were used for the extraction studies. The synergistic enhancement factor (R) could be obtained based on the experimental data [24],…”

Section: Solvent Extraction Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synergistic extraction and separation of Dysprosium and Europium by supported liquid membrane

Zaheri

Abolghasemi

Mohammadi

et al. 2015

Korean J. Chem. Eng.

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“…Mixtures of two different solvents, namely synergistic extraction, can intensify the extraction of a metal compared to the normal effect obtained by using these solvents separately 17 . Many authors reported the synergistic solvent extraction system for extracting and separating rare earths using acidic, natural and solvating solvents [18][19][20][21][22][23][24][25] . Various alternatives to solvent extraction have been explored and advances in separation technologies have shown commercial establishment of membrane technology to substitute conventional solvent extraction for metal and other valuable materials recovery.…”

Section: Introductionmentioning

confidence: 99%

Rare earth element enrichment using membrane based solvent extraction

Makertiharta¹,

Dharmawijaya²,

Zunita³

et al. 2017

AIP Conference Proceedings

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Abstract. The chemical, catalytic, electrical, magnetic, and optical properties of rare earth elements are required in broad applications. Rare earth elements have similar physical and chemical properties thus it is difficult to separate one from each other. Rare earth element is relatively abundant in earth's crust but rarely occur in high concentrated deposits. Traditionally, ion-exchange and solvent extraction techniques have been developed to separate and purify single rare earth solutions or compounds. Recently, membrane starts to gain attention for rare earth separation by combining membrane and proven technologies such as solvent extraction. Membrane-based process offers selective, reliable, energy efficient and easy to scale up separation. During membrane-based separation process, one phase passes through membrane pores while the other phase is rejected. There is no direct mixing of two phases thus the solvent loss is very low. Membrane can also lower solvent physical properties requirement (viscosity, density) and backmixing, eliminate flooding phenomenon and provide large interfacial area for mass transfer. This paper will summarize research efforts in developing membrane technology for rare earth element separation. Special attention will be given to solvent extraction related process as the commonly used method for rare earth element separation. Furthermore, membrane configuration and its potentials will also be discussed.

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“…The separation chemistry of rare earth ions (REs(III)) is hugely important due to their remarkable chemical similarity, but the selection of extractants is a key factor confining the development of the RE metals industry. Traditional organic amine, 1,3-diketonate, carboxylic acid, and phosphonic acid extractants are most commonly used in industrial REs(III) separation [2][3][4][5]. However, there are many limitations to these traditional extraction systems, including poor selectivity and stripping difficulty.…”

Section: Introductionmentioning

confidence: 99%

“…Several 1,3-diketonate extractants, including 2-thenoyltrifluoro-acetone (HTTA), 1,1,1-trifluoro-2,4-pentanedione (HTFA), and benzoyltrifluoroacetone (HBTA), are widely used for RE(III) extraction with various synergistic agents [16][17][18] owing to weak coordination between the 1,3-diketonate moiety and REs(III). The quaternary ammonium salt [A336]Cl is extensively used as a synergistic agent, often in combination with HTTA, for synergistic extraction of trivalent lanthanides [2,3], which has been found to be considerably enhanced relative to [A336]Cl salts or HTTA alone. Ammonium-Bif-ILEs containing 1,3-diketonate [19] anions [TTA]  have been reported for the extraction of plutonium(IV), but not for the extraction of REs(III) [20,21].…”

Section: Introductionmentioning

confidence: 99%

Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants

et al. 2016

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A series of ammonium-bifunctionalized ionic liquid extractants (ammonium-Bif-ILEs) combined with a number of anions, including carboxylic acids and 1,3-diketonates, have been prepared and studied in this report. Their extraction behavior and properties toward rare earth ions (REs(III)) are systematically investigated in chloride media as a function of important parameters such as aqueous phase pH, salting-out agent concentrations, and extraction temperature. The separation performance of ammonium-Bif-ILEs toward REs(III) are systematically discussed. The results demonstrate that ammonium-Bif-ILEs have a synergistic effect between the cation and anions in separation of REs(III). The influences of different anions on separation factor () values are further studied. By comparison, ammonium-Bif-ILEs containing 1,3-diketonates have more potential applications in La(III)/RE(III) separation than those containing carboxylic acids. ammonium-bifunctional ionic liquids, separation, rare earths Citation:Yang HL, Chen J, Wang W, Cui HM, Liu WG, Liu Y. Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants.

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Synergistic extraction and separation of yttrium from heavy rare earths using mixture of sec-octylphenoxy acetic acid and bis(2,4,4-trimethylpentyl)phosphinic acid

Cited by 109 publications

References 11 publications

Synergistic extraction and separation of Dysprosium and Europium by supported liquid membrane

Synergistic extraction and separation of Dysprosium and Europium by supported liquid membrane

Rare earth element enrichment using membrane based solvent extraction

Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants

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