Separation and Recovery of Rare-earth Metal Ions by Supported Liquid Membrane with Strip Dispersion
Date Issued
2016
Date
2016
Author(s)
Han, Jia-Yun
Abstract
Rare-earth metals have a wide range of applications like phosphors, permanent magnets, catalysts, and other advanced industrial devices due to their excellent performances even in trace amount. With the increasing demand for high purity of rare-earth metals and with the supply risk caused by China, the separation and recovery of a single rare-earth metal from minerals and industrial waste have gained much attention. The present work reports on the technique of supported liquid membranes with strip dispersion (SLMSD) to separate and recover two critical rare-earth metal ions, europium (III) and yttrium (III), with organic extractant di-(2-ethylhexyl)phosphoric acid (D2EHPA) in nitrate medium. First, the dominant reactions for single rare-earth metal ion in the solvent extraction were investigated by shaking-flask experiments to obtain accurate equilibrium constants. With the equilibrium constants, transport models describing the transport and reaction of single ion in SLMSD were developed with the factors, including extractant concentration, pH value in feed, and velocity of feed. The data calculated by the transport models show high consistence with the ones obtained from mixture experiments. Based on the results, the transport models provide good predictions for separation and recovery of rare-earth metal ions, which enables operators to choose the optimal experimental parameters more efficiently with certain high selectivity through SLMSD.
Subjects
supported liquid membrane with strip dispersion
europium
yttrium
di-(2-ethylhexyl) phosphoric acid
extraction mechanism
transport model
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-105-R02524037-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):a9e5ccf847ce8cf4f091ccf69150642e