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High-Gradient Magnetic Separation of Compact Fluorescent Lamp Phosphors: Elucidation of the Removal Dynamics in a Rotary Permanent Magnet Separator

Boelens, Peter; Lei, Zhe; Drobot, Björn; Rudolph, Martin; Li, Zichao; Franzreb, Matthias ORCID iD icon; Eckert, Kerstin; Lederer, Franziska

Abstract:

In an ongoing effort towards a more sustainable rare-earth element market, there is a high potential for an efficient recycling of rare-earth elements from end-of-life compact fluorescent lamps by physical separation of the individual phosphors. In this study, we investigate the separation of five fluorescent lamp particles by high-gradient magnetic separation in a rotary permanent magnet separator. We thoroughly characterize the phosphors by ICP-MS, laser diffraction analysis, gas displacement pycnometry, surface area analysis, SQUID-VSM, and Time-Resolved Laser-Induced Fluorescence Spectroscopy. We present a fast and reliable quantification method for mixtures of the investigated phosphors, based on a combination of Time-Resolved Laser-Induced Fluorescence Spectroscopy and parallel factor analysis. With this method, we were able to monitor each phosphors’ removal dynamics in the high-gradient magnetic separator and we estimate that the particles’ removal efficiencies are proportional to (d2·χ)1/3. Finally, we have found that the removed phosphors can readily be recovered easily from the separation cell by backwashing with an intermittent air–water flow. ... mehr

Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2075-163X
KITopen-ID: 1000141446
HGF-Programm 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Minerals
Verlag MDPI
Band 11
Heft 10
Seiten Art. Nr.: 1116
Vorab online veröffentlicht am 12.10.2021
Schlagwörter rare-earth elements; compact fluorescent lamp phosphors; time-resolved laser-induced fluorescence spectroscopy; PARAFAC; rotary permanent magnet separator; high-gradient magnetic separation; kelvin force
Nachgewiesen in Dimensions
OpenAlex
Scopus
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere EnergieZiel 12 – Nachhaltiger Konsum und ProduktionZiel 15 – Leben an Land

Verlagsausgabe §
DOI: 10.5445/IR/1000141446
Veröffentlicht am 21.12.2021
Originalveröffentlichung
DOI: 10.3390/min11101116
Scopus
Zitationen: 12
Web of Science
Zitationen: 11
Dimensions
Zitationen: 10
Seitenaufrufe: 110
seit 23.12.2021
Downloads: 118
seit 25.12.2021
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