期刊
JOURNAL OF CLEANER PRODUCTION
卷 238, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2019.117998
关键词
Recyle; Rare earth; Waste phosphors; Glass; Effctive; Economical
资金
- Youth Natural Science Foundation of the Jiangxi Province [20181BAB216025]
- Project of the Xijiang Innovation Team
In this study, desilication, decomposition, and acidolysis were used to recycle rare earth elements (REEs) from real waste trichromatic phosphors containing glass at laboratory and pilot plant scales. The effects of pre-sintering temperature, sieving, alkaline leaching conditions and alkaline fusion temperature on removal of glass and recovery of REEs were investigated. About 88% of glass fragments in the original matrix were removed after dry sieving through a 0.05 mm mesh sieve and leaching by 5 mol/L NaOH solution at 90 degrees C for 4 hat the appropriate 5:1 liquid-solid ratio. The blue and green phosphors were decomposed by alkaline fusion at 600 degrees C for 2 h. Y, Eu, Ce and Tb-rich solutions were respectively obtained by the two-steps acidolysis. The total leaching rate of REEs reached 94%, while the rates of Y, Eu, Ce, and Tb were 96%, 99%, 81%, and 92%, respectively. Furthermore, in the ton level industrial pilot, the successful application of this approach increased the recovery of the REEs up to 90% compared with the existing technology. Except for the fixed capital investments and taxes, this approach showed positive economic feasibility, since the savings are 1115 (sic)/ton. Therefore, recycling of REEs from waste phosphors is one of the cleaner and economical ways to balance the demand and supply of REEs outside of China. (C) 2019 Elsevier Ltd. All rights reserved.
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