Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 272, Issue -, Pages 96-101Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.02.043
Keywords
Dual dissolution by hydrochloric acid; Waste phosphor; Rare earth elements; Leaching rate
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Funding
- National Hi-tech R&D Program of China [2012AA063202]
- National Key Project of Scientific and Technical Support Program of China [2011BAE13B07, 2012BAC02B01, 2011BAC10B02]
- National Natural Science Foundation of China [51174247, 50972013]
- Guangdong Province Science and Technology Project [2010A030200003]
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This paper is a comparative study of recycling rare earth elements from waste phosphor, which focuses on the leaching rate and the technical principle. The traditional and dual dissolution by hydrochloric acid (DHA) methods were compared. The method of dual dissolution by hydrochloric acid has been developed. The Red rare earth phosphor (Y0.95Eu0.05)(2)O-3 in waste phosphor is dissolved during the first step of acid leaching, while the Green phosphor (Ce0.67Tb0.33MgAl11O19) and the Blue phosphor (Ba0.9Eu0.1MgAl10O17) mixed with caustic soda are obtained by alkali sintering. The excess caustic soda and NaAlO2 are removed by washing. The insoluble matter is leached by the hydrochloric acid, followed by solvent extraction and precipitation (the DHA method). In comparison, the total leaching rate of the rare earth elements was 94.6% by DHA, which is much higher than 42.08% achieved by the traditional method. The leaching rate of Y, Eu, Ce and Tb reached 94.6%, 99.05%, 71.45%, and 76.22%, respectively. DHA can decrease the consumption of chemicals and energy. The suggested DHA method is feasible for industrial applications. (C) 2014 Elsevier B.V. All rights reserved.
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