ビリジンまたはその誘導体の存在下でリン酸ジ-2-エチルヘキシルによる塩酸溶液からの希土類元素の液-液抽出 [in Japanese] Liquid-Liquid Extraction of Rare-Earth Elements from Hydrochloric Acid Solutions by Di-(2-Ethylhexy1)-Phosphoric Acid in the Presence of Pyridine or Its Derivatives [in Japanese]
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The distributions of trivalent rare-earth elements such as lanthanum, cerium, praseodymium, neodymium. samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium between hydrochloric acid solutions and solutions of di-(2-ethylhexyl)-phosphoric acid (DEHPA) + pyridine (py) or its derivatives in kerosene have been examined under different conditions. Infrared and nuclear magnetic resonance spectra were made for the organic extracts. As a result, the addition of pyridine or its derivatives gave the synergistic effect on the extraction of rare-earth elements from hydrochloric acid solutions by DEHPA. In those extraction systems, however, the variation of the distribution coefficients for rare-earth elements plotted as a fuction of their elements in the atomic numbers revealed the curve in tetrad effect similar to the extraction by DEHPA alone. It was found that the seperation factors of adjacent elements resemble each other.
- Journal of MMIJ
Journal of MMIJ 115(4), 252-256, 1999-04-25
The Mining and Materials Processing Institute of Japan