A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Surfactant-based enrichment of rare earth elements from NdFeB magnet e-waste : Optimisation of cloud formation and rare earths extraction (2023)
Patil, A. B., Thalmann, N., Torrent, L., Tarik, M., Struis, R. P. W. .., & Ludwig, C. (2023). Surfactant-based enrichment of rare earth elements from NdFeB magnet e-waste : Optimisation of cloud formation and rare earths extraction. Journal of Molecular Liquids, 382, Article 121905. https://doi.org/10.1016/j.molliq.2023.121905
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Patil, Ajay B.; Thalmann, Nicole; Torrent, Laura; Tarik, Mohamed; Struis, Rudolf P. W .J.; Ludwig, Christian
Lehti tai sarja: Journal of Molecular Liquids
ISSN: 0167-7322
eISSN: 1873-3166
Julkaisuvuosi: 2023
Ilmestymispäivä: 26.04.2023
Volyymi: 382
Artikkelinumero: 121905
Kustantaja: Elsevier BV
Julkaisumaa: Alankomaat
Julkaisun kieli: englanti
DOI: https://doi.org/10.1016/j.molliq.2023.121905
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/87997
Tiivistelmä
Appropriate waste and resource management are essential for a sustainable circular economy with reduced environmental impact. With critical resources, e-waste may serve as indirect raw material. For example, with NdFeB permanent magnets, Neodymium (Nd) and the co-present Dysprosium (Dy) are critical rare earth elements (REEs). However, there exists no economically viable technology for recycling them from electronic waste (e-waste). Here, a method is presented based on cloud point extraction (CPE). The work involves basic complexation chemistry in a cloud medium with pure REE salts, as well as, with real NdFeB-magnets (nearly 28% REE content by weight) from an old hard disk drive (5.2g magnet in a 375g HDD). High extraction efficiency (>95%) was achieved for each REE targeted (Nd, Dy, Praseodymium (Pr)). With the magnet waste, the cloud phase did hardly contain any Nickel (Ni), Cobalt (Co), or Boron (B), but some Aluminium (Al) and Iron (Fe). Dynamic light scattering results indicated aggregation of ligand-surfactant micelles with the cloud phase. The preconcentrated products can be used for new Nd magnet manufacturing or further enriched using established transition metal removal techniques. Reuse of solvent, low chemical inventory demand, and using non-inflammable, non-volatile organic extractants promise safe large-scale operation, low process costs, and less environmental impact than using hydrometallurgical methods used with urban or primary mining.
YSO-asiasanat: harvinaiset maametallit; talteenotto; uutto; pinta-aktiiviset aineet; sähkö- ja elektroniikkaromu; magneetit; kiertotalous; kierrätys
Vapaat asiasanat: circular economy; sustainability; rare earths; recycling; e-waste; cloud point extraction; resource management; critical raw materials; green process
Liittyvät organisaatiot
OKM-raportointi: Kyllä
Raportointivuosi: 2023
Alustava JUFO-taso: 1
