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Pré-Publication, Document De Travail Année : 2023

Kinetic study of rare earth elements extraction from decrepitated magnet powder using liquid magnesium

Résumé

This study presents a comprehensive investigation of neodymium extraction from decrepitated magnet powder using liquid magnesium. Neodynium extraction from the decrepitated magnet into the liquid magnesium was assessed between 700 and 900 °C by measuring the average length of the diffusion zone in sintered samples of 3 mm-thickness. Experiments were performed in a reactor which the design ensured a homogeneous distribution of magnesium through efficient agitation. An empirical model was used to model the growth kinetics of the diffusion zone by using the Rosin-Rammler equation to estimate particle size distribution. The results were extrapolated to decrepitated magnet powder particles to simulate the neodymium extraction performances. Remarkably, the treatment time required was relatively short, not exceeding 22 minutes, and varied depending on the extraction target and temperature. Both the temperature and the setpoint for the volume rate to be treated emerged as critical factors. Their impact on the process was thoroughly examined and discussed. These findings offer promising insights into the industrial feasibility of the use of liquid magnesium for rare-earth extraction from spent permanent magnet.
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Dates et versions

hal-04197578 , version 1 (06-09-2023)

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Nicolas Stankovic, Julien Jourdan, Jérôme Marin, Alexandre Chagnes, Thibault Quatravaux. Kinetic study of rare earth elements extraction from decrepitated magnet powder using liquid magnesium. 2023. ⟨hal-04197578⟩
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