Solvent extraction equilibrium of dysprosium(III) from nitric acid solutions with 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester

The necessity of Rare Earth Elements (REEs) recycling is crucial to minimizing their supply risk and provide an alternative to greener technologies. Hence, the REEs recovery from NdFeB magnet wastes using cationic extractants by solvent extraction technique has been investigated in this research. Due to the difficulty in maintaining the aqueous pH in the industrial counter-current devices when extractants like Cyanex 272 or Cyanex 572 are used, the Primene 81R·Cyanex 572 ionic liquid has been synthesised to overcome this. 99.99% Nd(III) recovery with a purity of 99.7% from an aqueous mixture of Nd/Tb/Dy in chloride medium, the three representative REEs present in the NdFeB magnets wastes, has been achieved after two stages counter-current extraction process using 0.30 M of Primene 81R·Cyanex 572 ionic liquid (1:4 A:O ratio) diluted in Solvesso 100, without any aqueous pH conditioning.

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“…(1)). The extraction process result obtained is also in accordance with references Tunsu et al (2016) and Huang and Tanaka, (2010).…”

Section: Effect Of Phsupporting

confidence: 84%

Neodymium recovery from NdFeB magnet wastes using Primene 81R·Cyanex 572 IL by solvent extraction

Pavón

Fortuny

Coll

et al. 2018

Journal of Environmental Management

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“…As was expected, the extraction process using D2EHPA is negatively influenced by the proton concentration according to the extraction mechanism using cationic extractants . Accordingly, the REE individual extraction percentages decrease when the proton concentration increases.…”

Section: Resultsmentioning

confidence: 95%

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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“…This distinguishes binary extraction from metal extraction with neutral extractants. Moreover, the same factor results in the linearity of the initial section of the extraction isotherm (if there are no salting-out additives in the aqueous or organic phases) 3. In contrast to cation exchange extraction, the coefficients of metal distribution in these systems depend slightly on the pH of aqueous solutions, at least in a quite wide pH range.…”

Section: Resultsmentioning

confidence: 99%

“…Conventional heterogeneous equilibrium constant for reaction (3), which excludes the activity coefficient …”

Section: Resultsmentioning

confidence: 99%

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Binary extraction of lanthanides (III) nitrates with carboxylates and dialkylphosphates of secondary and tertiary amines

Kalyakin

Кузьмин

Mulagaleeva

2016

Theor Found Chem Eng

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Abstract⎯The separation of lanthanide (III) ions with binary extractants based on carboxylates, di-(2-ethylhexyl)phosphates of secondary and tertiary amines and their mixtures has been studied. The parameters of lanthanide nitrates extraction from the aqueous phase by solutions of these substances in nonpolar diluents have been found to fit the binary extraction mechanism. For systems containing di-(2-ethylhexyl) phosphate and caprate of dioctylammonium and trioctylammonium, synergistic effects have been observed.

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Solvent extraction equilibrium of dysprosium(III) from nitric acid solutions with 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester

Cited by 22 publications

References 15 publications

Neodymium recovery from NdFeB magnet wastes using Primene 81R·Cyanex 572 IL by solvent extraction

Neodymium recovery from NdFeB magnet wastes using Primene 81R·Cyanex 572 IL by solvent extraction

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

Binary extraction of lanthanides (III) nitrates with carboxylates and dialkylphosphates of secondary and tertiary amines

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