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Recycling rare-earth elements (REEs) from Nd-Fe-B magnet waste is an important step towards building a sustainable REE supply chain. In this study, two different processes were systematically investigated and compared. In the leaching stage, the effect of increasing H 2 SO 4  or HCl concentrations were studied and it was determined that, although both can successfully promote REEs, B, Fe and Co leaching, HCl solutions extracted a wider range of metals. After leaching, the oxalate and double-sulfate precipitation methods were utilized to separate REEs from either HCl or H 2 SO 4  leachates. Results suggest that, although &gt; 99% REEs precipitation rates could be achieved with oxalate, the purity of REE-containing products is significantly affected by impurities like Fe and Co. In contrast, REE double-sulfate precipitation resulted in a product purity of &gt; 99%; however, high levels of Na 2 SO 4  (8 times the stoichiometric amount) were needed to achieve &gt; 98% of REE precipitation.

Comparison of Different Leaching Media and Their Effect on REEs Recovery from Spent Nd-Fe-B Magnets