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Liquid–Liquid Extraction of Uranium from Phosphoric Acid by HDEHP–CYANEX‐921 Mixture
Author(s) -
ElReefy Sohair A.,
Awwad Nasser S.,
Aly Hisham F.
Publication year - 1997
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199706)69:2<271::aid-jctb705>3.0.co;2-n
Subject(s) - phosphoric acid , uranyl , uranium , chemistry , phosphine oxide , extraction (chemistry) , mass transfer , kerosene , drop (telecommunication) , inorganic chemistry , nuclear chemistry , chromatography , ion , phosphine , materials science , metallurgy , organic chemistry , telecommunications , computer science , catalysis
The extraction of uranyl ions from different phosphoric acid media by CYANEX‐921 (a commercial trioctyl phosphine oxide) mixed with di‐2‐ethylhexyl phosphoric acid diluted with odourless kerosene has been investigated. The effect of phosphoric acid, CYANEX‐921 and HDEHP concentrations, as well as temperature on the extraction were studied. The extraction rate for UO 2 2+ transfer from 5 M phosphoric acid to the organic phase containing a CYANEX‐921–HDEHP mixture in a single drop column without external force was also studied. The mass transfer of uranium in the organic extractant single drop was investigated in terms of drop size, uranium concentration as well as other parameters. The extraction rate was found to be mainly dependent on uranium, HDEHP and phosphoric acid concentrations, and found to be mainly controlled by diffusion in the single drop. Further, it was found that CYANEX‐921 can substitute TOPO to synergise the extraction of UO 2 2+ by HDEHP. © 1997 SCI.