Floatability of rare earth phosphors from waste fluorescent lamps

Tsuyoshi Hirajima, A. Bissombolo, Keiko Sasaki, K. Nakayama, H. Hirai, M. Tsunekawa

Research output: Contribution to journalArticle

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Abstract

Zeta-potential measurements were made to determine the electric state of phosphor materials on the basis of which a feasibility study could be performed for the use of flotation in the recovery of fine (d50 < 13 μm) rare earth phosphors from waste fluorescent lamps. Tests were carried out with pure specimens of white (calcium halo-phosphate), red, green and blue (rare earth) phosphors, with a 17 : 1 : 1 : 1 ratio of their mixture, and with actual waste phosphor materials. The effects of a cationic (dodecyl ammonium acetate, DAA) and two anionic (sodium dodecyl sulfate (SDS) and sodium oleate (NaOl)) collectors on the floatability of materials, as well as that of Na 2SiO3 dispersant on the separation characteristics, were investigated at different pH ranges. The process, applied to actual discarded waste phosphors gave, in a two-stage separation scheme, sink products assaying 17.7-23.8% and 21.5-25.9% rare earth phosphors for DAA and SDS flotation, respectively. The recovery and Newton's efficiency were about 70-90% and 0.26-0.37, 66-82% and 0.18-0.20, respectively for DAA and SDS flotation.

Original languageEnglish
Pages (from-to)187-198
Number of pages12
JournalInternational Journal of Mineral Processing
Volume77
Issue number4
DOIs
Publication statusPublished - Dec 1 2005

Fingerprint

Fluorescent lamps
Phosphors
Rare earths
sodium
acetate
ammonium
Sodium dodecyl sulfate
sulfate
Flotation
Sodium Dodecyl Sulfate
dispersant
feasibility study
Recovery
calcium
phosphate
Calcium phosphate
Zeta potential
lamp
Sodium
material

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)
  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

Cite this

Floatability of rare earth phosphors from waste fluorescent lamps. / Hirajima, Tsuyoshi; Bissombolo, A.; Sasaki, Keiko; Nakayama, K.; Hirai, H.; Tsunekawa, M.

In: International Journal of Mineral Processing, Vol. 77, No. 4, 01.12.2005, p. 187-198.

Research output: Contribution to journalArticle

Hirajima, Tsuyoshi ; Bissombolo, A. ; Sasaki, Keiko ; Nakayama, K. ; Hirai, H. ; Tsunekawa, M. / Floatability of rare earth phosphors from waste fluorescent lamps. In: International Journal of Mineral Processing. 2005 ; Vol. 77, No. 4. pp. 187-198.
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