Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process.

ABSTRACT: There is considerable interest in extraction of rare earth elements from NdFeB magnets to enable recycling of these elements. In practical extraction methods using wet processes, the acid waste solution discharge is a problem that must be resolved to reduce the environmental impact of the process. Here, we present an encouraging demonstration of rare earth element extraction from a NdFeB magnet using a closed-loop hydrochloric acid (HCl)-based process. The extraction method is based on corrosion of the magnet in a pretreatment stage and a subsequent ionic liquid technique for Fe extraction from the HCl solution. The rare earth elements are then precipitated using oxalic acid. Triple extraction has been conducted and the recovery ratio of the rare earth elements from the solution is approxi

SUBMITTER: Kitagawa J 

PROVIDER: S-EPMC5556000 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature