|About this Abstract
||Part C-3: Processing of Critical Metals
||Extraction and Purification of Rare Earth Elements and Cobalt from NdFeB Magnet Wastes
||Hoda Emami, Pouya Hajiani
|On-Site Speaker (Planned)
In this study, a combined pyrometallurgical and hydrometallurgical technique has been used to recover mixed rare earth elements (REE) and cobalt from a NdFeB magnet waste, while addressing the cost of reagents. This process is considered adjustable to various NdFeB magnet wastes, regardless of their composition. Prior to the leaching, the magnet scrap was pretreated by two rounds of roasting (750 C in air) and a mechanical grinding in between, to convert iron metal to ferric oxide.
Subsequent leaching was performed in an optimized condition (pH, temperature and retention time) where the extraction ratio of REE to Fe III is the most. After removing iron content from leachate (pH≈3), REE was precipitated selectively and purified further. The produced REE concentrate reaches 99% purity with 85% recovery in a single run. The Cobalt oxide was isolated from PLS as a by-product of 99.8% purity.
||Planned: At-meeting proceedings