Publication: Recycling of NdFeB magnets using nitration, calcination and water leaching for REE recovery
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Publisher
Elsevier BV
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Abstract
Abstract NdFeB magnets currently dominate the magnet market. Supply risks of certain rare earth elements (REE), e.g. Nd and Dy, demand efficient recycling options that are applicable to different types and compositions with minimum use of chemicals and energy and with minimum waste generation. In this study, a combined pyro- and hydrometallurgical method is presented that is adjustable to all NdFeB magnets regardless of their composition. After completely transforming powdered samples into a metal nitrate mixture at room temperature for 1 h, a low-temperature (e.g. 200 °C) calcination and water leaching treatment resulted in 95–100% extraction efficiencies for Nd, Dy, Pr and Gd. The major impurity Fe (63.9 wt.%) almost completely remained in the resultant residue (e.g.
Description
Journal or Series
Hydrometallurgy
ISSN
0304-386X
ISBN
Rights
RESTRICTED
Keywords
Technology, Nitration, Science & Technology, NdFeB magnets, Neodymium, Thermolysis, Chemical Engineering, Resources engineering and extractive metallurgy, Resources Engineering and Extractive Metallurgy, RARE-EARTH, THERMAL-DECOMPOSITION, Chemical engineering, Dysprosium, Water leaching, Metal nitrates, Recycling, Metallurgy & Metallurgical Engineering, Calcination, Mining & Metallurgy