Liquid metal extraction of Nd from NdFeB magnet scrap

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2000-11-01
Authors
Xu, Y.
Chumbley, L.
Laabs, F.
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Materials Science and Engineering
Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.
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Materials Science and Engineering
Abstract

This research involves using molten magnesium (Mg) to remove neodymium (Nd) from NdFeB magnet scrap by diffusion. Mg was melted over pieces of NdFeB scrap and held at temperatures in the range 675–705 °C for 2–8 h. The Mg was allowed to solidify, and the castings were then sectioned and characterized using scanning electron microscopy, x-ray diffraction, and chemical analysis. Nd was found to have diffused out of the solid scrap into the molten Mg. The thickness of the diffusion layer was measured, the diffusion of Nd through the NdFeB scrap into liquid Mg was described, and the diffusion coefficient of Nd in liquid Mg was estimated.

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This article is from Journal of Materials Research 15 (2000): 2296-2304, doi: 10.1557/JMR.2000.0330. Posted with permission.

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Sat Jan 01 00:00:00 UTC 2000
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