The Influence of Lactic Acid Concentration on the Separation of Light Rare Earth Elements by Continuous Liquid–Liquid Extraction with 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester

Gomes, Rafael de Carvalho; Seruff, Luciana Amaral; Scal, Maíra Labanca Waineraich; Vera, Ysrael Marrero

doi:10.1007/s11663-017-1124-4

Cited by 13 publications

(7 citation statements)

References 7 publications

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“…Solvent extraction is a standard process currently employed for the removal of REEs from acidic leachates [18][19][20][21], especially for solutions containing high metal concentrations. Most of these highly efficient extractants are based on phosphorus reagents such as alkyl phosphate [19,[22][23][24][25][26], alkyl phosphoric acid [27][28][29], alkyl phosphine oxide [30,31], phosphonium ionic liquids [32,33] and organophosphonic extractants [34][35][36][37]. The strong affinity of phosphorus-based extractants for rare earth easily explains that a strong effort has been made for designing synthetic resins bearing phosphorus-based reactive groups such as Tulsion CH-96 and T-PAR resins [38,39], Tulsion CH-93 [34], Purolite S957 and Diphonix [40] or metal-organic frameworks [41].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)

et al. 2021

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High-tech applications require increasing amounts of rare earth elements (REE). Their recovery from low-grade minerals and their recycling from secondary sources (as waste materials) are of critical importance. There is increasing attention paid to the development of new sorbents for REE recovery from dilute solutions. A new generation of composite sorbents based on brown algal biomass (alginate) and polyethylenimine (PEI) was recently developed (ALPEI hydrogel beads). The phosphorylation of the beads strongly improves the affinity of the sorbents for REEs (such as La and Tb): by 4.5 to 6.9 times compared with raw beads. The synthesis procedure (epicholorhydrin-activation, phosphorylation and de-esterification) is investigated by XPS and FTIR for characterizing the grafting route but also for interpreting the binding mechanism (contribution of N-bearing from PEI, O-bearing from alginate and P-bearing groups). Metal ions can be readily eluted using an acidic calcium chloride solution, which regenerates the sorbent: the FTIR spectra are hardly changed after five successive cycles of sorption and desorption. The materials are also characterized by elemental, textural and thermogravimetric analyses. The phosphorylation of ALPEI beads by this new method opens promising perspectives for the recovery of these strategic metals from mild acid solutions (i.e., pH ~ 4).

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Section: Introductionmentioning

confidence: 99%

Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)

et al. 2021

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“…[6] As a significant group of extractants (cationic, anionic, solvating) for the extraction of rare earth elements, several extractants such as neutral organophosphorus esters, organophosphorus acid, and amines have been investigated; likewise, Diaminododecylphosphonic acid (DADTMTPA), Cyanex 572, Di(2-ethylhexyl) phosphoric acid (P204), di(1-methyl-heptyl) methyl phosphonate (P350), Cyanex 272, TBP, Cyanex 923, Cyanex 921, Cyanex 302, PC-88A and di(2-ethylhexyl)-phosphoric acid (D2EHPA). [19][20][21][22][23][24][25][26][27][28][29] The purpose of this study is to cast light upon the best conditions for cerium (III) extraction. Extraction tests are performed using diaminododecylphosphonic acid as an extracting agent.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the potential applications of phosphinic and phosphonic acids in the recovery of REEs from different aqueous solutions have received considerable attention [6] . As a significant group of extractants (cationic, anionic, solvating) for the extraction of rare earth elements, several extractants such as neutral organophosphorus esters, organophosphorus acid, and amines have been investigated; likewise, Diaminododecylphosphonic acid (DADTMTPA), Cyanex 572, Di(2‐ethylhexyl) phosphoric acid (P204), di(1‐methyl‐heptyl) methyl phosphonate (P350), Cyanex 272, TBP, Cyanex 923, Cyanex 921, Cyanex 302, PC‐88A and di(2‐ethylhexyl)‐phosphoric acid (D2EHPA) [19–29] …”

Section: Introductionmentioning

confidence: 99%

Extraction of Cerium (III) by a Solvent Extraction Technique Using Diaminododecylphosphonic Acid (DADTMTPA): Experimental, Density Functional Theory and Molecular Dynamic Studies

et al. 2023

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This paper aims to present the recent results progress on diaminododecylphosphonic acid (DADTMTPA) as an extractant of cerium (III) from Ce(NO 3 ) 3 .6H 2 O solution medium. Different parameters including pH, temperature, extractant concentration, and foreign ions present in the aqueous phase were examined to investigate the extractional mechanism. The optimum conditions of solvent extraction of Ce(III) are as follows: under experimental conditions of 298 K and the initial concentration of Ce(III) being kept at 10 À 4 M at pH 3.50. The agitation duration of 5 min for a volume ratio equal to 2, and the best yield is 77 % in one-step. An increase in the temper-ature reduced the extraction process. The DADTMTPA extracts Ce(III) after the second cycle with a yield of 95 %. The extraction thermodynamic parameters such as ΔG, ΔH and ΔS are also determined and reported. On the other hand, density functional theory (DFT) based on B97D3 functional with 6-311 + + G(d,p) basis set analysis and molecular dynamics simulations were used to extremely fast methods at calculating the nonbonded interactions and to understand its properties of molecular interactions, which have proved to be an adopted and useful tool to predict and describe the chemical behavior of the evolution of the system.

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“…Agentes acomplejantes como ácido etilendiaminotetraacético (EDTA), el ácido dietilenotriaminopenta acético (DTPA), ácido láctico, ácido acético ya fueron utilizados para favorecer en la separación de ETRs usando la ELL (Nishihama et al, 2000;Wang et al, 2004;Scal et al, 2016;Gomes et al, 2017). El EDTA adicionado en una solución conteniendo Ho/Y/Er funcionó como agente enmascarante de Ho y Er dejando el Y libre para ser extraído por el agente de extracción éster mono-2-etil-hexílico do ácido 2-etil-hexil fosfónico aumentando la selectividad de la separación.…”

Section: Introductionunclassified

“…En estudios anteriores realizados en el laboratorio de Hidrometalurgia del Centro de tecnología Mineral (Brasil) condicionando con ácido láctico la solución acuosa que contiene los ETRs, se ha comprobado la mejora del procedimiento de los reactivos de extracción ácidos organofosforados en la separación de didimio de lantano (Scal et al, 2016;Gomes et al, 2017). Los factores de separación entre los ETRs ligeros fueron mayores cuando el ácido láctico estaba presente en la solución de alimentación que cuando no lo estaba, en las mismas condiciones.…”

Section: Introductionunclassified

Estudio de la extracción de tierras raras ligeras a partir de la extracción líquido – líquido utilizando ácidos organofosforados y ácido ascórbico

Santos

Vera

2019

REVMETAL

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La extracción líquido – líquido (ELL) o extracción por Solvente (SX) es la técnica más utilizada, actualmente, para promover la separación de los Elementos Tierras Raras (ETRs), siendo los agentes de extracción ácidos organofosforados los más empleados. El uso de estos reactivos de extracción parcialmente saponificados aumenta tanto la extracción como la selectividad de la extracción de los ETRs. Sin embargo, esta práctica genera efluentes líquidos conteniendo sodio, amonio, magnesio o calcio que si no se eliminan pueden ocasionar daños al medio ambiente. En los últimos años se han buscado alternativas a la práctica de saponificación. La utilización de agentes acomplejantes, como el ácido ascórbico, puede ayudar a realizar la separación de los ETRs más eficientemente y sin provocar daños al medio ambiente por ser una sustancia biodegradable. El presente trabajo tuvo como objetivo evaluar la influencia de la concentración de ácido ascórbico sobre la extracción de lantano y didimio (Pr + Nd) a partir de la ELL. Se utilizaron tres agentes de extracción ácidos organofosforados (D2EHPA, P507 y Cyanex272). Se verificó que, con el aumento de la concentración del ácido ascórbico, hubo un incremento en el porcentaje de extracción y en la selectividad de la extracción de los ETR. Se definió, además, que el agente de extracción más eficiente en las condiciones estudiadas fue el P507. Consideramos que las mejores condiciones para realizar la separación entre La/didimio fue obtenida con el agente de extracción P507 y concentración de ácido ascórbico 0,5 mol·L-1. En esta condición se obtuvo una extracción de La, Pr y Nd igual a 12,3 ± 1,3%, 56,4 ± 1,0% y 64,8 ± 1,7%, respectivamente, así como un factor de separación de 9,3 ± 0,8 y didímio en fase orgánica con 81,4 ± 0,5 % de pureza.

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The Influence of Lactic Acid Concentration on the Separation of Light Rare Earth Elements by Continuous Liquid–Liquid Extraction with 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester

Cited by 13 publications

References 7 publications

Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)

Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)

Extraction of Cerium (III) by a Solvent Extraction Technique Using Diaminododecylphosphonic Acid (DADTMTPA): Experimental, Density Functional Theory and Molecular Dynamic Studies

Estudio de la extracción de tierras raras ligeras a partir de la extracción líquido – líquido utilizando ácidos organofosforados y ácido ascórbico

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