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Korean Journal of Metals and Materials > Volume 56(2); 2018 > Article
Korean Journal of Metals and Materials 2018;56(2): 146-154. doi: https://doi.org/10.3365/KJMM.2018.56.2.146
경희토류 혼합용액에서 PC88A와 Cyanex 572에 의한 La, Ce, Pr, Nd, Sm의 추출·분리 거동 비교
조연철1, 이주은1, 소홍일1, 안재우1, 김홍인2, 이진영2
1대진대학교 신소재공학과
2한국지질자원연구원 DMR융합연구단
Comparison of the Extraction and Separation Behavior of La, Ce, Pr, Nd, Sm from Light Rare Earth Mixed Solutions by PC88A and Cyanex 572
Yeon-Chul Cho1, Joo-eun Lee1, Hong-Il So1, Jae-Woo Ahn1, Hong-in Kim2, Jin-young Lee2
1Department of Advanced Materials Science and Engineering, Daejin University, Pocheon 11159, Republic of Korea
2Covergence Research Center for Development of Mineral Resources(DMR) Korea Institute of Geoscience and mineral Resources, Daejeon 34132, Republic of Korea
Correspondence  Jae-Woo Ahn ,Tel: +82-31-539-1982, Email: jwahn@daejin.ac.kr
Received: 18 October 2017;  Accepted: 15 November 2017.  Published online: 5 February 2018.
ABSTRACT
Solvent extraction of La, Ce, Pr, Nd and Sm from chloride solutions was studied using PC88A and Cyanex 572 as the extractants. Our results indicated that the acidity of the aqueous solution and saponification degree had some effect on the percentage extraction of metal ions. The distribution coefficient of the metal ions increased with increasing aqueous solution pH in both of PC88A and Cyanex 572. But the pH50 value was lowered by about 0.05~0.34 in PC88A. In extraction with saponified Cyanex 572 with NaOH, the distribution coefficients of the metal ions were independent of the degree of saponification, and did little to improve the separation behavior of these metal ions. With Cyanex 572 as the extractant, the separation factor of the binary La/Ce and Nd/Sm was enhanced about 5.0, but Ce/Pr and Pr/Nd showed no difference in separation factor as compared with PC88A. The group separation factor of La/(Pr, Nd, Sm) and (Pr, Nd)/Sm was increased by 3.0~8.0, but for (La, Ce)/(Pr, Nd) and Ce/(Pr, Nd) it was only increased by 0.2~0.7 in the Cyanex 572 system.
Keywords: rare earth metal, solvent extraction, Cyanex 572, PC88A, separation factor
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