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http://dx.doi.org/10.7844/kirr.2018.27.3.8

Solvent Extraction of Light (Pr, Nd) and Medium (Tb, Dy) Rare Earth Elements with PC88A of Rare Earth Chloride Solution from Waste Permanent Magnet  

Jeon, Su-Byung (School of Materials Science and Engineering, Kyungpook National University)
Son, InJoon (School of Materials Science and Engineering, Kyungpook National University)
Lim, Byung-Chul (SungLim Rare Earth Metal Co. Ltd.)
Kim, Jeong-Mo (SungLim Rare Earth Metal Co. Ltd.)
Kim, Yeon-Jin (SungLim Rare Earth Metal Co. Ltd.)
Ha, Tae-Gyu (SungLim Rare Earth Metal Co. Ltd.)
Yoon, Ho-Sung (Korea Institute of Geoscience and Mineral Resources)
Kim, Chul-Joo (Korea Institute of Geoscience and Mineral Resources)
Chung, Kyeong-Woo (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.27, no.3, 2018 , pp. 8-15 More about this Journal
Abstract
Solvent extraction behavior of light rare earth elements (Pr, Nd) and medium rare erath elements (Tb, Dy) in the HCl-PC88A-kerosene extraction system was investigated in order to separate high-purity light rare earths (Pr, Nd) and medium rare earths (Tb, Dy) in the mixed rare earth chloride solution. In the batch test step, it was confirmed that the separation efficiency was good when the extractant concentration (PC88A) was 0.5 M, the equilibrium pH after extraction was 0.8 to 1.0 (initial pH 1.3 of the feed), the concentrations of hydrochloric acid in scrubbing solution was set as 0.1 M, the concentrations of hydrochloric acid in stripping solution was set as 2.0 M or more. Based on the experimental data obtained from the batch test, the mixer-settler was composed as follows; 4 stages of extraction, 8 stages of scrubbing, 4 stages of stripping, and 3 stages of pickling organic solution. The Mixer-settler was operated for 180 hours, and the operating conditions were continuously adjusted to obtain the high-purity light/medium rare earths. Finally, the purity of light (Pr, Nd) and medium rare earth elements (Tb, Dy) was reached as 3 N class.
Keywords
Waste permanent magnet; PC88A; Solvent extraction; Mixer-settler; Light rare earth elements;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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