| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Sturm, Saso
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Topics
Publications (3/3 displayed)
- 2022Electrochemical routes for environmentally friendly recycling of rare-earth-based (Sm–Co) permanent magnetscitations
- 2020Image analysis data for the study of the reactivity of the phases in Nd-Fe-B magnets etched with HCl-saturated Cyphos IL 101citations
- 2019Coercivity increase of the recycled HDDR Nd-Fe-B powders doped with DyF3 and processed via Spark Plasma Sintering & the effect of thermal treatmentscitations
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article
Electrochemical routes for environmentally friendly recycling of rare-earth-based (Sm–Co) permanent magnets
Abstract
<jats:title>Abstract</jats:title><jats:p>The consumption of critical raw materials, especially those in permanent magnets of Nd–Fe–B and Sm–Co-type, has significantly grown in the past decade. With predictions on further electrification growing exponentially the demand for these materials will even increase. This implies that efforts in assuring sustainability must involve recycling from secondary resources. In recent years the electrochemical approaches in recycling have been extensively investigated and applied owing to their advantages of high efficiency and selectivity, easy operation, low energy consumption, and environmental friendliness. In this paper, we investigate the Sm<jats:sub>2</jats:sub>(Co,Fe,Cu,Zr)<jats:sub>17</jats:sub> permanent magnet leaching process using the anodic oxidation to be paired with the metal deposition on the cathode. Linear sweep voltammetry was performed from − 0.15 to 1 V versus Pt quasi reference electrode that indicated current peaks that would correspond to some preferential leaching of the crystal phases contained in the magnet. The latter was confirmed using the SEM/EDXS analysis. The continuous leaching of the Sm<jats:sub>2</jats:sub>(Co,Fe,Cu,Zr)<jats:sub>17</jats:sub> magnet was performed at a direct current density of 2, 4 and 8 mA cm<jats:sup>−2</jats:sup> at the time period of 0–240, 240–480 and 480–720 min, respectively. The ICP-MS results confirmed the leaching of all the metals from the original Sm<jats:sub>2</jats:sub>(Co,Fe,Cu,Zr)<jats:sub>17</jats:sub> permanent magnet. The concentration of Sm<jats:sup>3+</jats:sup>, Cu<jats:sup>2+</jats:sup>, Fe<jats:sup>2+</jats:sup> and Zr<jats:sup>2+</jats:sup> increases linearly along with the leaching time. Reversely the concentration of Co<jats:sup>2+</jats:sup> decreases linearly due to its consumption by electrodeposition of Co, Fe and Cu on the cathode. The presented paired electrochemical process could serve as a starting point for the recycling and recovery of critical raw materials without any acid usage and waste generation.</jats:p><jats:p><jats:bold>Graphical abstract</jats:bold></jats:p>