|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||REWAS 2022: Poster Session
||KIGAM Technology for the Recovery of NdFeB Waste Magnet and Manufacturing Scraps
||Kyeong Woo Chung, Ho-sung Yoon, Chul-joo Kim, Rina Kim, Byunchul Lim
|On-Site Speaker (Planned)
At KIGAM, the pilot plants have been developed and demonstrated two processes for recycling NdFeB waste magnets and manufacturing scraps. The former process uses thermal oxidation as a pretreatment before. The latter does caustic digestion and the thermal oxidation process. About 35% of the iron in feed was co-leached with REEs upon leaching of thermally oxidized products. Therefore, the separation process of REEs and non-REEs was carried out using the double-salt precipitation method to produce a high purity REEs solution applicable for solvent extraction. Instead, the leaching yield of iron upon leaching of caustic digestion and thermal oxidation products showed a value of 0.01%. Thus the high purity REEs solution was obtained and directly applied to solvent extraction. Finally, REEs-compounds of 99.9% or above could be obtained by solvent extraction using mixer settler and precipitation from raffinate and stripping solutions.
||Recycling and Secondary Recovery,