Journal
HYDROMETALLURGY
Volume 169, Issue -, Pages 158-164Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hydromet.2017.01.005
Keywords
Cyanex (R) 572; Thorium; Rare earth; Separation; Waste residues
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Funding
- Chinese Academy of Sciences
- National Natural Science Foundation of China [21571179]
- Science and Technology Major Projects of Fujian Province [2015HZ0001-3]
- Natural Science Foundation of Fujian Province [2016J0102]
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In this paper, a process for the separation of thorium (Th) and rare earth elements (REEs) from radioactive waste residues of ion-absorbed type rare earth minerals using Cyanex (R) 572 (C572) as a new extractant has been developed. The extraction and stripping properties of Th and REEs with Cyanex (R) 572 were studied systematically. The separation factor of Th to Lu, beta(Th/Lu), are higher than 80 and 1.46 x 10(3), when the equilibrium HCl concentration is larger than 03 and 1.0 mol/L, respectively. The separation selectivity of Th and REEs showed good performance in the extraction system consisting of C572 and isooctanol in 260# kerosene with the beta(Th/Sigma REEs), value of 438 x 10(4). The leaching rates of Th and REEs from the roasted waste residues by HCl were found to be 69.6% and 92.1%, respectively. Recovery of Th and REEs can be achieved by total 10 stages of extraction, scrubbing and stripping section. (C) 2017 Elsevier B.V. All rights reserved.
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