Scholarly record
RECYCLING OF NEODYMIUM FROM PERMANENT MAGNETS
Abstract
Due to the increased demand and supply shortage, neodymium is listed as critical raw material of the strategic importance in many countries in the world. From this point of view the researches for the development of recycling technologies for this metal are strongly justified. The paper presents the results of laboratory research on the hydrometallurgical recycling of neodymium from hard disk drivers (HDDs). Neodymium magnets are the elements of a positioner which drives the head of the HDD. The study material- sintered magnets- was obtained from the dismantling of HDDs from personal computers. In the hydrometallurgical method, the removed magnets were demagnetized by heating above the Curie point. Then, magnets were crushed and ground for an XRD analysis, which showed the Nd2F14B as the dominant phase in the sample. An XRF analysis was also carried out, which showed 22% of neodymium in the sample. The material was then leached in solutions with different concentrations of sulfuric acid. The neodymium fluoride, which was the final product, was precipitated with ammonium fluoride.
Publication Impact Profile
Publication details
References5
Walton A., Han Yi, Rowson N.A., Speight J.D., Mann V.S.J., Sheridan R.S., A. Bradshaw, Harris I.R., . Williams A.J, The use of hydrogen to separate and recycle neodymium-iron-boron-type magnets from electronic waste, Journal of Cleaner Production, 104, pp 236-241, 2015.
Critical raw materials for the EU, “Report of the ad-hoc working group on defining critical raw materials”, 2010.
US Department of Energy, “Critical materials strategy”, 2010.
Munchen D. D., Veit H.M., Neodymium as the main feature of permanent magnets from hard disk drives (HDDs), Waste Management, 61 pp 372-376, 2017.
Palencar M., Miskufova A., Kochmanova A., Horvathova H., Hydrometallurgical treatment of used Nd-Fe-B magnets, 2015 Sustainable Industrial Processing Summit, Volume 11: Recycling & Environmental.
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.
