A one-pot process based on P44414Cl-HCl aqueous biphasic system for recovering rare earth elements from NdFeB permanent magnet

Liu, Chuanying; Yan, Qibin; Zhang, Qizhou; Lei, Lecheng; Xiao, Chengliang

doi:10.1016/j.cclet.2021.07.026

Cited by 8 publications

(3 citation statements)

References 43 publications

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“…In the past decades, some methods have been reported for the recovery of RE ions, such as membrane separation, solvent extraction, ion exchange, and chemical precipitation. − However, these techniques may face some drawbacks, such as high energy consumption, tedious operation, low efficiency, or potential secondary pollution. For instance, the extraction method commonly needs a mass of organic solvents and multiple extraction steps.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Metal–Organic Framework Adsorbent Constructed via Ligand Tailoring for Rare-Earth Metal Ion Recovery

Zhao,

Wu,

Gai

et al. 2023

ACS Appl. Nano Mater.

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Section: Introductionmentioning

confidence: 99%

Nanoporous Metal–Organic Framework Adsorbent Constructed via Ligand Tailoring for Rare-Earth Metal Ion Recovery

Zhao,

Wu,

Gai

et al. 2023

ACS Appl. Nano Mater.

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“…In recent years, several green solvents, such as deep eutectic solvents (DESs), 13 ionic liquid-based aqueous biphasic system (ILABS), 14 and inorganic salts, 15 were proposed to selectively recover REE from the secondary leaching solution. Among these processes, phase transformation of the components was implemented before the green solvents were employed.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Selective Transformation of Ceria Sulfation and Iron/Manganese Mineralization for Enhancing the Selective Recovery of Rare Earth Elements

Zhou

Xiao

Guo

et al. 2023

Environ. Sci. Technol.

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To cope with the urgent and unprecedented demands for rare earth elements (REEs) in sophisticated industries, increased attention has been paid to REE recovery from recycled streams. However, the similar geochemical behaviors of REEs and transition metals often result in poor separation performance due to nonselectivity. Here, a unique approach based on the selective transformation between ceria sulfation and iron/ manganese mineralization was proposed, leading to the enhancement of the selective separation of REEs. The mechanism of the selective transformation of minerals could be ascribed to the distinct geochemical and metallurgical properties of ions, resulting in different combinations of cations and anions. According to hardsoft acid-base (HSAB) theory, the strong Lewis acid of Ce(III) was inclined to combine with the hard base of sulfates (SO 4 2− ), while the borderline acid of Fe(II)/Mn(II) prefers to interact with oxygen ions (O 2-). Both in situ characterization and density functional theory (DFT) calculation further revealed that such selective transformation might trigger by the generation of an oxygen vacancy on the surface of CeO 2 , leading to the formation of Ce 2 (SO 4 ) 3 and Fe/Mn spinel. Although the electron density difference of the configurations (CeO 2−x -SO 4 , Fe 2 O 3−x -SO 4 , and MnO 2−x -SO 4 ) shared a similar direction of the electron transfer from the metals to the sulfate-based oxygen, the higher electron depletion of Ce (Q Ce = −1.91 e) than Fe (Q Fe = −1.66 e) and Mn (Q Mn = −1.64 e) indicated the higher stability in the Ce−O−S complex, resulting in the larger adsorption energy of CeO 2−x -SO 4 (−6.88 eV) compared with Fe 2 O 3−x -SO 4 (−3.10 eV) and MnO 2−x -SO 4 (−2.49 eV). This research provided new insights into the selective transformation of REEs and transition metals in pyrometallurgy and thus offered a new approach for the selective recovery of REEs from secondary resources.

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“…Therefore, the separation and purification of REEs have always been a huge challenge in the field of separation science. However, industrial applications have high requirements for the purity of rare earths; in the past few decades, scientific researchers have developed a variety of techniques for achieving the separation of REEs, such as chemical precipitation method, , ion-exchange method, solvent extraction method, − membrane separation method, , and adsorption method. − However, chemical precipitation, solvent extraction, and ion exchange methods have some problems such as long operation cycle, high cost, low separation efficiency, and waste liquid treatment. − As an emerging separation technology, membrane separation has a good separation effect. Although it avoids the use of a large number of organic reagents, the problems of membrane stability and pollution caused by it still need to be resolved. ,− Therefore, in recent years, the adsorption separation of solid phase has become the most commercially valuable separation technology because of its simplicity, low cost, and environmental protection. − …”

Section: Introductionmentioning

confidence: 99%

Selective Adsorption of Rare Earth Elements by Zn-BDC MOF/Graphene Oxide Nanocomposites Synthesized via In Situ Interlayer-Confined Strategy

Chen

Zhan

Chen

et al. 2022

Ind. Eng. Chem. Res.

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Separation of rare earth elements has always been an urgent problem in the industry. Although a variety of adsorption materials have been developed for the adsorption and separation of rare earth elements, it is difficult to achieve high adsorption capacity and high separation selectivity from most of them at the same time. In this work, to combine the advantages of the good adsorption capacity of graphene oxide (GO) and high separation selectivity of metal organic frameworks (MOFs), two-dimensional MOFs and GO nanocomposite materials (2D Zn-BDC MOF/GO) were synthesized by a solvothermal interlayer-confined strategy. The composite material has a maximum adsorption capacity of 344.48 mg/g for rare earth ions, with the selectivity of Sc/Tm ≈ 529.57, Sc/Er ≈ 461.91, Sc/Y ≈ 445.70, and Tm/Eu ≈ 4.55. This work brings us a new route to synthesize 2D MOF/GO nanocomposite materials and combine their advantages for the separation of rare earth elements in chemical engineering research.

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A one-pot process based on P44414Cl-HCl aqueous biphasic system for recovering rare earth elements from NdFeB permanent magnet

Cited by 8 publications

References 43 publications

Nanoporous Metal–Organic Framework Adsorbent Constructed via Ligand Tailoring for Rare-Earth Metal Ion Recovery

Nanoporous Metal–Organic Framework Adsorbent Constructed via Ligand Tailoring for Rare-Earth Metal Ion Recovery

Insights into the Selective Transformation of Ceria Sulfation and Iron/Manganese Mineralization for Enhancing the Selective Recovery of Rare Earth Elements

Selective Adsorption of Rare Earth Elements by Zn-BDC MOF/Graphene Oxide Nanocomposites Synthesized via In Situ Interlayer-Confined Strategy

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