TY - JOUR
T1 - Comparison of Different Leaching Media and Their Effect on REEs Recovery from Spent Nd-Fe-B Magnets
AU - Liu, Fupeng
AU - Porvali, Antti
AU - Halli, Petteri
AU - Wilson, Benjamin P.
AU - Lundström, Mari
N1 - Funding Information:
Open access funding provided by Aalto University. The authors acknowledge HYMAG project (SL/84/04.03.00.0400/2017) funded by the Regional Council of Satakunta, AIKO funding. This paper also made use of the Academy of Finland?s RawMatTERS Finland Infrastructure (RAMI) based at Aalto University and the Association of Finnish Steel and Metal Producers (METSEK-project). The authors would also like to acknowledge the financial support from the National Nature Science Foundation of China (No.51804141) as well as the Science and Technology Project of the Education Department of Jiangxi Province (GJJ170533).
Funding Information:
Open access funding provided by Aalto University. The authors acknowledge HYMAG project (SL/84/04.03.00.0400/2017) funded by the Regional Council of Satakunta, AIKO funding. This paper also made use of the Academy of Finland’s RawMatTERS Finland Infrastructure (RAMI) based at Aalto University and the Association of Finnish Steel and Metal Producers (METSEK-project). The authors would also like to acknowledge the financial support from the National Nature Science Foundation of China (No.51804141) as well as the Science and Technology Project of the Education Department of Jiangxi Province (GJJ170533).
Publisher Copyright:
© 2019, The Author(s).
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - 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 H2SO4 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 H2SO4 leachates. Results suggest that, although > 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 > 99%; however, high levels of Na2SO4 (8 times the stoichiometric amount) were needed to achieve > 98% of REE precipitation.
AB - 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 H2SO4 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 H2SO4 leachates. Results suggest that, although > 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 > 99%; however, high levels of Na2SO4 (8 times the stoichiometric amount) were needed to achieve > 98% of REE precipitation.
UR - http://www.scopus.com/inward/record.url?scp=85074460370&partnerID=8YFLogxK
U2 - 10.1007/s11837-019-03844-7
DO - 10.1007/s11837-019-03844-7
M3 - Article
AN - SCOPUS:85074460370
SN - 1047-4838
VL - 72
SP - 806
EP - 815
JO - JOM: The Journal of The Minerals, Metals & Materials Society
JF - JOM: The Journal of The Minerals, Metals & Materials Society
IS - 2
ER -