Solvent extraction, separation and recovery of dysprosium (Dy) and neodymium (Nd) from aqueous solutions: Waste recycling strategies for permanent magnet processing

Yoon, Ho-Sung; Kim, Chul-Joo; Chung, Kyeong-Woo; Kim, Sung-Don; Lee, Jin Young; Kumar, J. Rajesh

doi:10.1016/j.hydromet.2016.01.028

Cited by 124 publications

(62 citation statements)

References 58 publications

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“…Rare-earth metals are both recycled and produced through the hydrometallurgical method. Therefore, it is necessary to apply complicated processes using different extractants, often accompanied by toxicity and high costs [21,22].…”

Section: Introductionmentioning

confidence: 99%

Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

et al. 2019

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An attempt is made to achieve a continuous enrichment of rare-earth metal ions from aqueous solutions in a microflow device by applying magnetic forcing. An aqueous solution containing holmium(III) ions is pumped through a small channel which was exposed to a strong inhomogeneous magnetic field. At the outflow, the near-and far-field parts of the flow are separated and analyzed using UV-Vis spectroscopy. The relative change of ion concentration is determined from the measured absorbance. Results are reported for three different types of flow cells at different flow rates and magnetic field strengths and for a cascaded application of cells. The change of concentration is found to be small, and no clear trend can currently be stated due to the error margin of the concentration measurement. Keywords Microflow. Spectrophotometry. Rare-earth elements. Magnetic field. Continuous separation Highlights • The influence of a magnetic field gradient on the transport of Ho(III) ions in microflow cells was studied. • The magnetic field gradient dependent on the orientation of the cell in the magnetic field was simulated. The distribution of Ho(III) ions is analyzed using UV/Vis spectroscopy. • A detailed analysis of different aspects influencing ion transport in the continuous flow process is presented.

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Section: Introductionmentioning

confidence: 99%

Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

et al. 2019

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“…Urban mining of PMs which contain about 25% of Nd(III) (Vander Hoogerstraete et al, 2014) has become increasingly interesting in the recent years. One of the potential mechanisms that have been tested for the recovery of Nd(III) from leaching streams is the solvent extraction (Yoon et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Experimental and modelling studies of neodymium solvent extraction from chloride media with methyl-tri(octyl/decyl)ammonium oleate ionic liquid diluted in kerosene

et al. 2017

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A study of the solvent extraction process of Nd(III) from chloride solutions has been carried out using an ionic liquid (AliOle) prepared from Aliquat 336 (Methyl-tri(octyl/decyl)ammonium chloride) and Oleic Acid. The IL was chosen among other homemade ionic liquids and commercial extractants due to its high Nd(III) extraction ability and good phase separation. Increasing AliOle concentration improves the extraction of Nd(III) as expected. The pH of the aqueous phase strongly influences the extraction process. The appropriate equilibrium pH region has been established in the range 5–6.5. The effect of chloride concentration in the aqueous phase has been investigated. High concentrations of Cl- anion contribute to increasing the extraction yield by promoting neodymium(III) speciation in the aqueous phase. Two extraction models are proposed from experimental data. Chloride concentration in the aqueous phase determines the Nd(III) extraction mechanism. The models consider extraction of Nd3 + species when chloride concentration in the solution is low and NdCl2 + species when chloride concentration is high. Competitive extraction between HCl and the metal ions is also included in the models. They are able to reproduce feasibly the experimental Nd(III) extraction extension.Peer ReviewedPreprin

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“…43 Most of these effective processes rely on combining two extractants and an optimized ''diluent'' with the so-called modifiers. 10,11,[46][47][48][49] To optimize a process, both ''yield'', expressed in mass extracted by unit of time, and ''selectivity'' in differentiating ''target'' from ''non-target'' elements are considered. 50 In the absence of general predictive theory for the selectivity of multi-component complex fluids, 34,43,51 optimization requires very lengthy experimental plans.…”

Section: Resultsmentioning

confidence: 99%

“…[5][6][7] A critical example can be found in the case of rare earth elements (REEs) that are key elements in so many applications surrounding us, especially in the electronic and energy sector. 3,8,9 Many of such processes are based on liquid-liquid extraction, [10][11][12][13][14] hence making use of very complex formulations, often referred to as complex fluids. 13,15 Ion transfer between two phases and its driving force have been the subject of many kinetic, thermodynamic, theoretical, and modeling studies which require years of research with yet many remaining unknowns.…”

Section: Introductionmentioning

confidence: 99%

A microfluidic study of synergic liquid–liquid extraction of rare earth elements

Maangar

Theisen

Penisson

et al. 2020

Phys. Chem. Chem. Phys.

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Solvent extraction, separation and recovery of dysprosium (Dy) and neodymium (Nd) from aqueous solutions: Waste recycling strategies for permanent magnet processing

Cited by 124 publications

References 58 publications

Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

Experiments on the magnetic enrichment of rare-earth metal ions in aqueous solutions in a microflow device

Experimental and modelling studies of neodymium solvent extraction from chloride media with methyl-tri(octyl/decyl)ammonium oleate ionic liquid diluted in kerosene

A microfluidic study of synergic liquid–liquid extraction of rare earth elements

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