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http://dx.doi.org/10.7844/kirr.2020.29.3.61

A Study on Improvement of Recycling Process of Waste Fluorescent Lamps  

Lee, Gee Hun (University of Seoul)
Lee, Dong Hoon (University of Seoul)
Song, Young Jun (Kangwon National University)
Kim, Chang Kwon (Korea Lighting Recycling Corporation)
Publication Information
Resources Recycling / v.29, no.3, 2020 , pp. 61-74 More about this Journal
Abstract
This study was conducted to improve the recycling process of waste fluorescent lamp, and investigate the possibility of using the waste fluorescent lamp glass as a raw material for glass beads, the leaching method of rare earth from the waste phosphor powder, and the possibility of solvent extraction of rare earth from the rare earth leaching solution. The waste phosphor contained 28.9% yttrium oxide, 3.46% cerium oxide, 1.95% europium oxide, 1.76% terbium oxide, and 1.43% lanthanum oxide. As a result of the trial production of glass beads using waste fluorescent lamp glass, it was judged that the production yield and quality were excellent, so that waste fluorescent lamp glass could be used as a raw material for glass beads. The soda roasted waste phosphor was leached in water and thereby the aqueous solution was blown with CO2 to drop the pH to about 7, Then, Al, Si and residual N2CO3 were dissolved, and NaAlCO3(OH)2 and SiO2 were precipitated in the aqueous solution. In the solvent extraction of cyanex272-hydrochloric acid, cyanex272-sulfuric acid, D2EHPA-hydrochloric acid, D2EHPA-sulfuric acid, Ionquest290-hydrochloric acid, Ionquest290-sulfuric acid, p507-hydrochloric acid using xylene as a diluent, the extraction yield of Y, Eu, Ce, La, and Tb are close to 100%. However, in this conditions, the difference in extraction yield for each element, that is, selectivity is 16% or less.
Keywords
Waste fluorescent lamp; recycling; process; improvement; Rare earth elements;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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