Recovery of yttrium and europium from spent fluorescent lamps using pure levulinic acid and the deep eutectic solvent levulinic acid-choline chloride.

ABSTRACT: A solvometallurgical approach for the recovery of rare-earth elements from lamp phosphor waste was developed. The solubility of individual phosphors in different deep-eutectic solvents (DESs) was measured. The DES levulinic acid-choline chloride (x _ChCl = 0.33) showed high solubility of the YOX phosphor (Y₂O₃:Eu³⁺) and low solubility of the HALO phosphor (Sr,Ca)₁₀(PO₄)(Cl,F)₂:Sb³⁺,Mn²⁺, which does not contain any rare-earth element. This DES was selected for further investigation. When the DES was compared to pure levulinic acid, very similar leaching behaviour was observed, showing that the proton activity is more important than the chloride as a metal ligand. The leaching of YOX and

SUBMITTER: Pateli IM 

PROVIDER: S-EPMC9055884 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature