LIQUID-LIQUID-EXTRACTION OF URANIUM(VI) BY CYANEX-301 ALAMINE-308 ANDTHEIR MIXTURES WITH TBP DDSO/

Quantitative extraction of uranium(VI) is observed from 0.2M HCl by 5% (v/v) Cyanex 301. The extraction decreases with increasing acid conce ntration. Mixtures of Cyanex 301 with tri-n-butyl phosphate (TBP), did ecyl sulfoxide (DDSO) and Alamine 308 result in significant synergism in the extraction process, where a species of the type UO2R2. L is pro posed to be extracted [RH = Cyanex 301 and L = TBP, DDSO or Alamine 30 9]. Significant extraction of uranium(VI) by 5% (v/v) Alamine 308 is o bserved al and above 2M HCl, which increases with further increase in acidity attaining a maximum at approximately 6M. after which a slight decrease in extraction is observed. Mixtures of Alamine 308 with TBP o r DDSO result in a synergism, where a species of the type (R3'NH)2UO2C l4 . L is extracted. [R3'N = Alamine 308. L = TBP or DDSO]. Mixtures o f Alamine 308 and Cyanex 301 at greater-than-or-equal-to 2M HCl result in a profound antagonism in the extraction of uranium(VI).