TY - JOUR
T1 - Selective Extraction of Rare Earth Elements from Permanent Magnet Scraps with Membrane Solvent Extraction
AU - Kim, Daejin
AU - Powell, Lawrence E.
AU - Delmau, Lætitia H.
AU - Peterson, Eric S.
AU - Herchenroeder, Jim
AU - Bhave, Ramesh R.
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/6/24
Y1 - 2015/6/24
N2 - The rare earth elements (REEs) such as neodymium, praseodymium, and dysprosium were successfully recovered from commercial NdFeB magnets and industrial scrap magnets via membrane assisted solvent extraction (MSX). A hollow fiber membrane system was evaluated to extract REEs in a single step with the feed and strip solutions circulating continuously through the MSX system. The effects of several experimental variables on REE extraction such as flow rate, concentration of REEs in the feed solution, membrane configuration, and composition of acids were investigated with the MSX system. A multimembrane module configuration with REEs dissolved in aqueous nitric acid solutions showed high selectivity for REE extraction with no coextraction of non-REEs, whereas the use of aqueous hydrochloric acid solution resulted in coextraction of non-REEs due to the formation of chloroanions of non-REEs. The REE oxides were recovered from the strip solution through precipitation, drying, and annealing steps. The resulting REE oxides were characterized with XRD, SEM-EDX, and ICP-OES, demonstrating that the membrane assisted solvent extraction is capable of selectively recovering pure REEs from the industrial scrap magnets.
AB - The rare earth elements (REEs) such as neodymium, praseodymium, and dysprosium were successfully recovered from commercial NdFeB magnets and industrial scrap magnets via membrane assisted solvent extraction (MSX). A hollow fiber membrane system was evaluated to extract REEs in a single step with the feed and strip solutions circulating continuously through the MSX system. The effects of several experimental variables on REE extraction such as flow rate, concentration of REEs in the feed solution, membrane configuration, and composition of acids were investigated with the MSX system. A multimembrane module configuration with REEs dissolved in aqueous nitric acid solutions showed high selectivity for REE extraction with no coextraction of non-REEs, whereas the use of aqueous hydrochloric acid solution resulted in coextraction of non-REEs due to the formation of chloroanions of non-REEs. The REE oxides were recovered from the strip solution through precipitation, drying, and annealing steps. The resulting REE oxides were characterized with XRD, SEM-EDX, and ICP-OES, demonstrating that the membrane assisted solvent extraction is capable of selectively recovering pure REEs from the industrial scrap magnets.
UR - http://www.scopus.com/inward/record.url?scp=84939631520&partnerID=8YFLogxK
U2 - 10.1021/acs.est.5b01306
DO - 10.1021/acs.est.5b01306
M3 - Article
C2 - 26107531
AN - SCOPUS:84939631520
SN - 0013-936X
VL - 49
SP - 9452
EP - 9459
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 16
ER -