Synergistic extraction and separation of rare earths from chloride medium by the mixture of HEHAPP and D2EHPA

Kuang, Shengting; Zhang, Zhifeng; Li, Yanling; Wei, Haiqin; Liao, Wuping

doi:10.1016/j.hydromet.2017.09.011

Cited by 46 publications

(28 citation statements)

References 32 publications

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“…For example, in Fig. 2 the distribution coefficients of Lu 3+ with HEHAPP and D2EHPA are shown 45 . Figure 2(a) shows the individual extraction power of 0.008 mol L –1 HEHAPP and 0.024 mol L –1 D2EHPA; as observed, the added effects are indeed less than their mixture effect; that is 0.008 mol L –1 HEHAPP + 0.024 mol L –1 D2EHPA.…”

Section: Methodsmentioning

confidence: 72%

Relative distribution enhancement: a new factor for the evaluation of synergistic solvent extraction

Gómez-Sánchez

Koga

Kim

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Solvent extraction is one of the most used processes worldwide for metal extraction at an industrial and laboratory scale. As a process that requires an external component, the selection of extractants is one of the most studied topics to find the most suitable ones for a particular case. The use of combined reagents, or so‐called synergistic extractants, is a branch of extraction studies that have proven better results than the use of solvents on their own. However, a comparison between synergistic extractants cannot be made with the currently reported factors. This paper provides a guide on clarifying the implications of the conventional synergistic factor, R, for the evaluation of the best extractant combinations. Moreover, a new indicator is proposed, named relative distribution enhancement factor, H, that will quantitatively measure the efficiency of the extraction and compare extraction enhancement among different experimental research. RESULTS Four references were selected to illustrate the use of the H factor in contrast with the R factor. The usefulness of the new enhancement factor H was demonstrated by evaluating the synergistic solvent extraction of rare earth elements. It was found that the use of R factors can mislead the selection of extractants ratio, and although synergism exists this does not imply an enhanced extraction. CONCLUSION The main finding of this work is that the newly developed H factor can easily detect extraction enhancement or diminishment and is not limited to the evaluation of two extractants. © 2021 Society of Chemical Industry (SCI).

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Section: Methodsmentioning

confidence: 72%

Relative distribution enhancement: a new factor for the evaluation of synergistic solvent extraction

Gómez-Sánchez

Koga

Kim

et al. 2021

J of Chemical Tech & Biotech

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“…The standard deviation for the models depicted in Equation and Equations was 5.8 and 6.7, respectively and it means that the model accuracies are similar in the whole range of the three studied parameters. As numerous studies in the literature suggested that the cationic extractants like D2EHPA are considered in dimeric form and its high dimerization constant value (4·10 4 ), the models described in Equations seem to be the more suitable ones, due to the monomeric consideration of the extractant in the Equation .…”

Section: Resultsmentioning

confidence: 99%

“…According to the most frequently used coordination numbers for REEs and recent publications, the model in Equation is the one chosen to describe the extraction mechanism for Ce(III), Eu(III), and Y(III) using D2EHPA as extractant. Although the formation constants values found in the literature were used to initialize the program, they were not able to match the experimental extraction results for the REEs.…”

Section: Resultsmentioning

confidence: 99%

“…To date, solvent extraction (SX) is the most common technique used for the recovery and separation of REEs using a wide range of extractants, mainly the cationic ones such as bis‐(2,4,4‐trimethylpentyl) phosphinic acid (Cyanex 272, Cy272), di‐(2‐ethylhexyl)phosphoric acid and a mixture of phosphinic and phosphonic acids (Cyanex 572, Cy572) have been reached . Owing to the acidic character of these extractants (Cy272 < Cy572 < D2EHPA), the pH turns out to be one of the most interesting parameters to study because the protons play a crucial role in the extraction mechanism . Innocenzi et al suggest that the REEs extraction is possible using Cy272, Cy572, and D2EHPA from sulphuric leaching solutions coming from the dissolution of fluorescent powders of lamps.…”

Section: Introductionmentioning

confidence: 99%

“…Nie et al postulate Cy572 as the best extractant, instead of P507 (2‐ethylhexylphosponic acid mono‐2‐ethylhexyl ester), TBP (tributyl‐phosphate), or Cyanex 923 (a mixture of four trialkylphosphine oxides), to recover Sc in chloride media from leaching solutions of a tungsten residue by SX . A mixture of HEHAPP (2‐ethylhexyl‐3‐(2‐ethylhexylamino)pentan‐3‐yl‐phosphonic acid) and D2EHPA could be an efficient synergic extraction system for the heavy REEs separation according to Kuang et al…”

Section: Introductionmentioning

confidence: 99%

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Solvent extraction modeling of Ce/Eu/Y from chloride media using D2EHPA

et al. 2019

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End‐of‐life fluorescent lamps are becoming essential in the rare earths (REEs) field and suppose a feasible secondary source for getting them, reducing thus their supply risk. Considering the proved viability of the cationic extractants, the present study aims at establishing a solvent extraction model using di‐(2‐ethylhexyl)phosphoric acid (D2EHPA) not only based on the individual Ce, Eu, and Y behavior in chloride media, but also bearing in mind the competitive extraction of these metals in Ce/Eu/Y mixtures, depending on the media variables. Furthermore, the model allow determining the optimal REEs separation conditions. The results disclose that Y could be separated from the mixture using 0.1 mol/L D2EHPA, acidity above of 3 mol/L of protons and chloride concentrations higher than 4 mol/L.

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Amine/Carboxylic Acid Based Bifunctional Ionic Liquids as Extractants for Nd(III), Sm(III) and Eu(III) from Aqueous Solution Containing EDTA

2022

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Two bi-functional ionic liquid extractants (Bif-ILs) comprising tertiary amine and carboxylic acids, namely [TOAH] + [OHex] À (Tri-n-octylaminehexanoate) and [TOAH] + [ODec] À (Tri-n-octylaminedecanoate) in kerosene have been used for extraction of Nd(III), Sm(III) and Eu(III) from aqueous phase with EDTA as a complexing agent. The extraction ability of both the extracting agents has been analyzed with respect to variations in shaking time, concentration of extractant, aqueous phase pH, molarity of EDTA, diluents and phase volume ratio. Using 0.08 mol/L EDTA,extraction of Nd(III) was maximum with both the extractants followed by Sm(III) and Eu(III).At 4 : 1 (O/A) phase volume ratio, the extraction percentages using [TOAH] + [OHex] À were 93.42 % (Nd), 89.83 % (Sm), 84.14 % (Eu) and with [TOAH] + [ODec] À the values were 90.42 % (Nd), 89.37 % (Sm), 83.65 % (Eu), respectively.Extraction efficiency of both Bif-ILs is maximum for Nd(III). Stripping was quantitative with HNO 3 and HCl.Speciation studies and FTIR spectra provide valuable information regarding the stoichiometry of the extracted species.

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Synergistic extraction and separation of rare earths from chloride medium by the mixture of HEHAPP and D2EHPA

Cited by 46 publications

References 32 publications

Relative distribution enhancement: a new factor for the evaluation of synergistic solvent extraction

Relative distribution enhancement: a new factor for the evaluation of synergistic solvent extraction

Solvent extraction modeling of Ce/Eu/Y from chloride media using D2EHPA

Amine/Carboxylic Acid Based Bifunctional Ionic Liquids as Extractants for Nd(III), Sm(III) and Eu(III) from Aqueous Solution Containing EDTA

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