Abstract
It was shown by the authors (J. Phys. and Colloid Chem.; 54: 954-957(Jun 1950) that the leaching of mixed solid thorium and rare earth nitrates with higher alcohols and ketones results in a considerable increase in the proportion of thorium nitrate. The present paper demonstrates that the last 10 to 20% of rare earth nitrates can be removed by a liquid-liquid extraction process. The only condition which is critical to the process is that the starting aqueous solution must be kept quite near to saturation with respect to thorium nitrate.
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