Cation-Exchange Separation of Scandium from the Rare-Earth Elements
作者:
K.A. Orlandini,
J. Korkisch,
期刊:
Separation Science
(Taylor Available online 1968)
卷期:
Volume 3,
issue 3
页码: 255-263
ISSN:0037-2366
年代: 1968
DOI:10.1080/01496396808052213
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
From certain organic solvents containing organic phosphorus compounds such as trioctylphosphine oxide (TOPO), bis(2-ethylhexyl)orthophosphoric acid (HDEHP), or tri-n-butylphosphate (TBP) and hydrochloric acid, scandium is much less retained on the strongly acidic cation-exchange resin Dowex 50 than are all other members of the rare-earth group. Thus on this resin in a medium which is 95% tetrahydrofuran, 5% 6 M hydrochloric acid, and 0.1 M TOPO, the separation factor for scandium-rare earths is greater than 4 × 103(corresponding to distribution coefficients of < 1 for scandium and >4 × 103for all the other rare-earth elements). By the use of this system a complete and highly effective separation of tracer and macro quantities of scandium from the rare earths can be achieved on a column of this exchanger. Among the organic solvents investigated, tetrahydrofuran gives the best results. The effectiveness of the organic extractants increases in the order TBP < HDEHP < TOPO
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