A facile method for the simultaneous recovery of rare-earth elements and transition metals from Nd–Fe–B magnets

Xu, Xuan; Šturm, Sašo; Samardžija, Zoran; Ščančar, Janez; Marković, Katarina; Rožman, Kristina Žužek

doi:10.1039/c9gc03325d

Cited by 35 publications

(22 citation statements)

References 26 publications

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“…For this reason, electrodeposition from aqueous electrolyte solutions is not feasible ( Sanchez-Cupido et al., 2019 ). On the other hand, their highly negative potentials have been used as a basis for selective anodic dissolution from NdFeB magnets, as well as the selective separation of any co-dissolved non-REEs by cathodic electrodeposition ( Prakash et al., 2016 ; Xu et al., 2020 ). Given the arduous challenge of plating rare earths in aqueous environment, electrodeposition in nonaqueous electrolytes, and high temperatures, has often been proposed as an effective approach.…”

Section: Electrochemical Separations For Selective Recoverymentioning

confidence: 99%

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Kim¹,

Candeago²,

Rim³

et al. 2021

iScience

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Summary Critical minerals are essential for the ever-increasing urban and industrial activities in modern society. The shift to cost-efficient and ecofriendly urban mining can be an avenue to replace the traditional linear flow of virgin-mined materials. Electrochemical separation technologies provide a sustainable approach to metal recovery, through possible integration with renewable energy, the minimization of external chemical input, as well as reducing secondary pollution. In this review, recent advances in electrochemically mediated technologies for metal recovery are discussed, with a focus on rare earth elements and other key critical materials for the modern circular economy. Given the extreme heterogeneity of hydrometallurgically-derived media of complex feedstocks, we focus on the nature of molecular selectivity in various electrochemically assisted recovery techniques. Finally, we provide a perspective on the challenges and opportunities for process intensification in critical materials recycling, especially through combining electrochemical and hydrometallurgical separation steps.

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Section: Electrochemical Separations For Selective Recoverymentioning

confidence: 99%

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Kim¹,

Candeago²,

Rim³

et al. 2021

iScience

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“…After an initial study on a mono‐elemental system with cerium as target ion, investigated both in static and dynamic adsorption regime with both SWCNT‐BP and MOF@SWCNT‐BP composites, we focused on REE recovery study in a multi‐elemental system under dynamic conditions. [ 44,45 ]…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Enhanced Capture Properties of a New BioMOF@SWCNT‐BP: Recovery of the Endangered Rare‐Earth Elements from Aqueous Systems

Tursi

Mastropietro

Bruno

et al. 2021

Adv Materials Inter

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Human society is facing—among other environmental threats—an enormous challenge due to human activities. The extensive use of high‐tech devices and electronics equipment in the daily life makes, among others, rare‐earth elements (REEs) recovery from secondary sources highly required. Here, a novel bioMOF‐based single‐walled carbon nanotube buckypaper (SWCNTBP) is presented as a new and efficient composite material (BioMOF@SWCNT‐BP). The flexible and highly crystalline metal–organic framework (MOF), prepared from the natural amino acid L‐threonine, has been homogeneously dispersed within the tangled net of a self‐standing SWCNT‐BP for lanthanides recovery from water. This MOF‐carbon‐based membrane exhibits high efficiency, either in static or dynamic regimes, in the recovery of lanthanides from aqueous streams outperforming the state‐of‐the‐art. The capture performances of BPs are successfully improved after incorporation of such MOF featuring hexagonal functional channels decorated with the threonine amino acid residues, pointing toward the accessible void spaces, which boosts the capture properties of the final membrane, providing the adaptable functional environment to interact with lanthanides. This material's preparation presents also a potential for large‐scale applications with a potential benefit on natural aquatic ecosystems as well. It is highly demanded because REEs from non‐recycled waste materials are potential pollutants for surface waters.

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“…This is mainly due to the selective extraction of Cu by ammonium ions during the initial leaching process. Similarly, the current controlled electrodeposition method was used to selectively reduce Fe 2+ in the leachate derived from an aqueous solution containing a mixture of Fe 2+ and Nd 3+ , obtained from the leaching of wasted permanent magnets (Nd-Fe-B) [65]. The reduction potential of Fe 2+ was selectively adjusted by changing the pH of the medium through the addition of ammonium sulfate ((NH 4 ) 2 SO 4 ) and sodium citrate (Na 3 Cit).…”

Section: The Various Approaches For Electrochemical Recovery Of Metals 41 Potential Controlled and Current Controlled Electrodepositionmentioning

confidence: 99%

Electrochemical Approaches for the Recovery of Metals from Electronic Waste: A Critical Review

et al. 2021

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Electronic waste (e-waste) management and recycling are gaining significant attention due to the presence of precious, critical, or strategic metals combined with the associated environmental burden of recovering metals from natural mines. Metal recovery from e-waste is being prioritized in metallurgical extraction owing to the fast depletion of natural mineral ores and the limited geographical availability of critical and/or strategic metals. Following collection, sorting, and physical pre-treatment of e-waste, electrochemical processes-based metal recovery involves leaching metals in an ionic form in a suitable electrolyte. Electrochemical metal recovery from e-waste uses much less solvent (minimal reagent) and shows convenient and precise control, reduced energy consumption, and low environmental impact. This critical review article covers recent progress in such electrochemical metal recovery from e-waste, emphasizing the comparative significance of electrochemical methods over other methods in the context of an industrial perspective.

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A facile method for the simultaneous recovery of rare-earth elements and transition metals from Nd–Fe–B magnets

Abstract: A closed loop of recovering rare-earth elements and transition metals from Nd–Fe–B magnets with the total re-use of the electrolyte using a facile electrolysis-selective precipitation procedure.

Cited by 35 publications

References 26 publications

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Synthesis and Enhanced Capture Properties of a New BioMOF@SWCNT‐BP: Recovery of the Endangered Rare‐Earth Elements from Aqueous Systems

Electrochemical Approaches for the Recovery of Metals from Electronic Waste: A Critical Review

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