Journal
HYDROMETALLURGY
Volume 187, Issue -, Pages 38-44Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2019.04.030
Keywords
Rare-earth recovery; Lamp phosphor waste; Sodium carbonate roasting; Solvent extraction
Categories
Funding
- European Union's Horizon 2020 research and innovation programme [680629]
- H2020 Societal Challenges Programme [680629] Funding Source: H2020 Societal Challenges Programme
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In the present work rare-earth recovery was performed from a residue of a hydrometallurgical process based on sulphuric acid leaching of lamp phosphor waste by which the red phosphor Y2O3:Eu3+ was removed for further recovery. The undissolved residue is rich in lanthanum, cerium and the valuable terbium, present as phosphates and aluminates in the green and blue phosphors. The process here proposed is based on an integrated pyrohydrometallurgical approach involving a thermal treatment (roasting in the presence of sodium carbonate) aimed at converting rare-earth phosphates into oxides, which can be more easily leached by mineral acids (HCI and H2SO4) in a further leaching step. Rare-earth recovery from the leachate was then performed by solvent extraction with the extractant di-(2-ethylhexyl)phosphoric acid, D2EHPA, followed by precipitation with oxalic acid and calcination. 82% Ce, 75% La and 82% Tb were recovered as mixed La2O3 + CeO2 oxide (99% purity) and Tb4O7 (64% purity).
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