Extraction of Rare Earth Elements from Permanent Magnet Scraps by VIM-HMS Method

Yu Yang Bian; Shu Qiang Guo; Kai Tang; Wei Zhong Ding

doi:10.4028/www.scientific.net/MSF.863.139

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HomeMaterials Science ForumMaterials Science Forum Vol. 863Extraction of Rare Earth Elements from Permanent...

Extraction of Rare Earth Elements from Permanent Magnet Scraps by VIM-HMS Method

Abstract:

VIM-HMS method is a novel process to extract REEs (rare earth elements) from NdFeB based permanent magnets. The NdFeB materials were melted in graphite crucible by VIM (vacuum induction melting) process, and the carbon saturated NdFeBC_sat alloy was obtained. The NdFeBC_sat alloy was mechanically pulverized and hydrolyzed in deionized water. In the HMS (Hydrolysis and magnetic separation) process, the neodymium carbide phase in the alloy reacted with water easily, and the rare earth hydroxides and the iron residues were separated by magnetic separation. The purity of the rare earth hydroxides was more than 99%, and the extraction ratio of the REEs is about 93%.

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Periodical:

Materials Science Forum (Volume 863)

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139-143

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https://doi.org/10.4028/www.scientific.net/MSF.863.139

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Online since:

August 2016

Authors:

Yu Yang Bian*, Shu Qiang Guo, Kai Tang, Wei Zhong Ding

Keywords:

Extraction, NdFeB Magnet, Rare Earth Elements, Recycling

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