EXTRACTION OR SEPARATION OF URANIUM, THORIUM AND RARE EARTH ELEMENTS BY TREATING CHLORIDE SOLUTION THEREOF

摘要

Rare earth, uranium and thorium values are separated and recovered from aqueous solutions of the chlorides thereof, said aqueous solutions having an acidity of less than 2 N and a concentration in such values, expressed as the oxides thereof, of at least 50 g/l, by liquid-liquid extracting said aqueous solutions with an organic extractant comprising at least one neutral organophosphorus compound.