Abstract
Solvent extraction of thorium by 30 vol % dibutyl butylphosphonate-70 vol % Isopar H from salted and nonsalted nitric acid solutions was studied. Thorium distribution coefficients D/sub Th/'s were obtained for nitric acid solutions of approx. 0.3 to approx. 12 N and for solutions of 1 and 2 M NH/sub 4/NO/sub 3/ over the HNO/sub 3/ concentration range of approx. 0.5 to approx. 9 N. The nitric acid solution D/sub Th/'s varied from approx. 4.3 at the lowest acidity, increased to a maximum of approx. 40 at approx. 3-4 N H/sup +/, and then gradually decreased to approx. 18 at approx. 11.5 N H/sup +/. The solutions containing 1 and 2 M NH/sub 4/NO/sub 3/ gave definite salting-out effects with D/sub Th/'s of 79 to 90, respectively, at the lowest acidities; these values then decreased with acidity increases to those of the nonsalted acid solutions at approx. 5 N HNO/sub 3/ and paralleled the acid solution values up to approx. 12 N.
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