Extraction of scandium, rare-earth elements, and yttrium from nitric acid solutions by selected diphosphine dioxides

被引：30
|
作者：
Turanov, AN [1 ]
Karandashev, VK
Kharitonov, AV
Yarkevich, AN
Safronova, ZV
机构：
[1] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia
[2] Russian Acad Sci, Inst Microelect Technol & High Pur Mat, Chernogolovka 142432, Russia
[3] Russian Acad Sci, Inst Physiol Act Cpds, Chernogolovka 142432, Russia
来源：
SOLVENT EXTRACTION AND ION EXCHANGE | 2000年 / 18卷 / 06期
关键词：
D O I：
10.1080/07366290008934724
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The extraction of microquantities of Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y from HNO3 solutions by selected diphosphine dioxides of various structures in dichlorethane has been studied. It has been found that the extraction of these elements decreases with an increase in the number of methylene units (n) in the molecule of dioxide Ph2P(O)(CH2)(n)P(O)Ph-2. Extractability of rare-earth elements decreases from La to Lu when methylene dioxide is used. With ethylene dioxides, it changes in the reverse order. The effect of HNO3 concentration in the aqueous phase and that of the extractants in the organic phase on the extraction of Sc, rare earth elements, and Y are considered. The stoichiometry of the extracted complexes has been determined and the extraction constants calculated.
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页码：1109 / 1134
页数：26
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