Journal
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
Volume 16, Issue 4, Pages 635-641Publisher
SPRINGER
DOI: 10.1007/s10163-014-0295-1
Keywords
Waste fluorescent phosphors; Rare earth; Alkali fusion; Leaching efficiency
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In this paper, an efficient recovery of rare earth elements from waste fluorescent phosphors has been reported and the novel process of alkali fusion and acid leaching has been proposed. The experimental results have shown that the key for efficient recycling is the complete dissolution of waste fluorescent phosphors. The Na2O2-to-waste mass ratio, calcination temperature and reactive time play considerable roles in rare earth elements extraction during the alkali fusion process. The optimal conditions in terms of temperature, time and Na2O2-to-waste mass ratio are 650 A degrees C, 15 min and 2:1, respectively, under which more than 99.5 % rare earth elements are extracted. The possible reaction mechanism of alkali fusion has been proposed.
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