Recovery of rare earth elements from simulated fluorescent powder using bifunctional ionic liquid extractants (Bif‐ILEs) |
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Authors: | Hualing Yang Wei Wang Hongmin Cui Dongli Zhang Yu Liu Ji Chen |
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Affiliation: | 1. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun130022, China;2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, PR China |
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Abstract: | BACKGROUND: Numerous high purity ammonium‐type ionic liquid extractants have been prepared for engineering purposes. Bifunctional ionic liquid extractants (Bif‐ILEs) have been widely applied to separate and extract rare earths and metal ions with high extraction efficiencies and selectivities. In the present study, new Bif‐ILEs A336]P204] and A336]P507] have been used to extract rare earths from a simulated solution of a fluorescent powder in a high concentration of Al(NO3)3. RESULTS: Bif‐ILEs were prepared from Aliquat336 (A336) and the commercial organophosphorus acid extractants, P204 and P507. These extractants A336]P204] and A336]P507] have similar characteristics to neutral organophosphorus extractants. When these Bif‐ILEs were used to extract RE(III) from a simulated waste fluorescent powder system a third phase appeared which could be eliminated by the addition of 10% isopropanol modifier. The coexisting Al2O3 in the fluorescent powder was changed to a salting‐out agent (Al(NO3)3) in the extraction process and promoted the extraction efficiency of RE(III). Using a countercurrent extraction process at a phase ratio Vo:Vw = 4:1 and pH = 0.56, the RE(III) recovery reached 95.2% in 5–7 stages. Finally, the extractabilities of these bifunctional extractants were compared with the neutral organophosphorus extractants P350, TBP and Cyanex923 at different concentrations, initial pHs and temperatures. CONCLUSIONS: By comparison with other neutral organophosphorus extractants, Bif‐ILEs A336]P204] and A336]P507] can be considered efficient potential extractants for separating and recycling REEs and Al2O3 from waste fluorescent powder. Copyright © 2011 Society of Chemical Industry |
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Keywords: | rare earth elements bifunctional ionic liquid extractant extraction waste fluorescent powder |
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