Trends in separation factors for the lanthanum series as obtained in solvent extraction from an aqueous thiocyanate solution |
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| Affiliation: | 1. The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;2. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China;1. Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, China;2. Ganzhou Rare Earth Group Co., Ltd., Ganzhou 341000, China;1. Department of Physics, Chung Yuan Christian University, Taoyuan City 32023, Taiwan;2. Center for Nano-Technology, Chung Yuan Christian University, Taoyuan City 32023, Taiwan;3. Graduate Institute of Electro-Optical Engineering, Tatung University, Taipei 10452, Taiwan;4. Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan;5. Institute of Nuclear Energy Research, Longtan 32546, Taiwan |
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| Abstract: | Liquid-liquid distribution of all 15 elements in the lanthanum series has been studied using di(2-ethylhexyl) phosphoric acid and tri-n-butylphosphate in n-octane and Adogen 464 in 10% n-octanol-90% n-octane as organic phases and 1 M ammonium thiocyanate as aqueous phase. Appropriate radioactive isotopes of the elements were used as indicators in the determination of the distributions. The great variation in the shape of the curves for separation factors vs atomic number, Z, is discussed in terms of ionic radius, coordination or solvation numbers and the nephelauxetic ratio change as visualized in the Siekierski-effect. |
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