Recovery of neodymium and praseodymium from nitrate-based leachate of permanent magnet by solvent extraction with trioctylphosphine oxide

Rho, Bong-Jo; Sun, Panpan; Cho, Sung Yong

doi:10.1016/j.seppur.2019.116429

Cited by 35 publications

(12 citation statements)

References 23 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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“…The results for initial Nd concentration of 0.05 M were not used as the maximum workable TOPO Yang et al [30] found maximum extraction percentages of 80 % at a Nd:TOPO ratio of 1:350, whereas in the current study similar extraction percentages are achieved at a 1:5 ratio only. Rho et al [31] investigated extractions using the same extractant and initial Nd concentrations as those here but with kerosene as the organic solvent. The extraction percentage is plotted in Fig.…”

Section: Equilibrium Studies and Mechanism Of Extractionmentioning

confidence: 99%

Intensified Nd Extraction in Small Channels for Ndfeb Magnet Recycling

PHEASEY

Angeli

2022

SSRN Journal

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“…Considering the instable supply chain of REEs, such as Nd and Dy, which are core constituents of NdFeB magnets, recovering REEs from end-of-life magnets is an essential way to decrease the supply risk . Various metallurgical processes were carried out to separate and recover the REEs from the spent NdFeB magnets, including hydrometallurgy, − pyrometallurgy, − chlorinated metallurgy, , electrochemistry, − solvometallurgy, liquid metal extraction, and membrane separation. , …”

Section: Introductionmentioning

confidence: 99%

ZnCl₂: A Green Brønsted Acid for Selectively Recovering Rare Earth Elements from Spent NdFeB Permanent Magnets

Ding

Liu

Zhang

et al. 2022

Environ. Sci. Technol.

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The spent neodymium–iron–boron (NdFeB) magnet is a highly valuable secondary resource of rare earth elements (REEs). Hydrometallurgical processes are widely used in recovering REEs from spent NdFeB magnets, but they will consume large amounts of organic chemicals, leading to severe environmental pollution. This work developed an alternative green route to selectively recover REEs from spent NdFeB permanent magnets using a purely inorganic zinc salt. The Hammett acidity measurement showed that concentrated ZnCl2 solutions could be regarded as a strong Brønsted acid. Concentrated ZnCl2 solutions achieved a high separation factor (>1 × 105) between neodymium and iron through simple dissolution of their corresponding oxide mixture. In the simulated recovery process of spent NdFeB magnets, the Nd2O3 product was successfully recovered with a purity close to 100% after selective leaching by ZnCl2 solution, sulfate double-salt precipitation, and oxalic acid precipitation. The separation performance of the ZnCl2 solution for Nd2O3 and Fe2O3 remained almost unchanged after four cycles. The energy consumption and chemical inputs of this process are about 1/10 and half of the traditional hydrometallurgy process separately. This work provides a promising approach for the green recovery of secondary REE resources.

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Recovery of neodymium and praseodymium from nitrate-based leachate of permanent magnet by solvent extraction with trioctylphosphine oxide

Cited by 35 publications

References 23 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)

Intensified Nd Extraction in Small Channels for Ndfeb Magnet Recycling

ZnCl₂: A Green Brønsted Acid for Selectively Recovering Rare Earth Elements from Spent NdFeB Permanent Magnets

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Recovery of neodymium and praseodymium from nitrate-based leachate of permanent magnet by solvent extraction with trioctylphosphine oxide

Cited by 35 publications

References 23 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)

Intensified Nd Extraction in Small Channels for Ndfeb Magnet Recycling

ZnCl2: A Green Brønsted Acid for Selectively Recovering Rare Earth Elements from Spent NdFeB Permanent Magnets

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Resources

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ZnCl₂: A Green Brønsted Acid for Selectively Recovering Rare Earth Elements from Spent NdFeB Permanent Magnets