Separation of red (Y2O3:Eu3+), blue (BaMgAl10O17:Eu2+) and green (CeMgAl10O17:Tb3) rare earth phosphors by liquid/liquid extraction |
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Authors: | Guangjun Mei Peng Rao Mitsuaki Matsuda and Toyohisa Fujita |
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Affiliation: | (1) School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China;(2) Department of Material-Process & Applied Chemistry for Environments, Akita University, Akita 010-8502, Japan |
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Abstract: | A novel process for separation of red (Y2O3:Eu3+), blue(BaMgAl10O17:Eu2+) and green (CeMgAl10O17:Tb3) rare earth fluorescent powders was proposed. At first, the blue powder can be extracted selectively from an aqueous solution
using a chelating collector 2-thenoyltrifluoroacetone (TTA) dissolved in heptane at alkaline pH condition, then, chloroform
was used for extracting the green powder into organic phase. The red phosphor remains in aqueous phase with potassium sodium
tartrate depressant (PST). Therefore, three phosphors can be separated successfully from their artificial mixtures by liquid/liquid
extraction, and grades and recovery of separated products reach respectively as follows: red is 96.9% and 95.2%, blue is 82.7%
and 98.8%, green is 94.6% and 82.6%.
Funded by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (ROCS, SEM
2005] No. 383) |
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Keywords: | rare earth phosphor solid-solid separation liquid/liquid extraction |
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