Abstract
The extraction of niobium, tantalum and protactinium from hydrochloric acid solutions containing fluoride into chloroform solutions of N-benzoyl- N-phenylhydroxylamine has been studied. From such aqueous systems it is possible to separate pairs or all three of these elements efficiently and in a reasonably quantitative manner. In addition, protactinium may be easily separated from zirconium (and presumably also hafnium), aluminium, titanium, manganesc(II), iron(III), rare earths and thorium by extracting it from concentrated hydrochloric acid solutions. The back-extraction of niobium, tantalum and protactinium into aqueous phases of various compositions and additional separations thus revealed are also discussed. Phase distribution measurements and separations have been performed using suitable radioactive isotopes of the elements concerned.
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