PURPOSE: To selectively extract actinide in an organic solvent by adding thiocyanate to an aqueous nitric solution and by contacting the solution with the organic solvent containing a specific propane diamide.
CONSTITUTION: When actinide is separated from lanthanide in the aqueous nitric solution, thiocyanate is added first into the solution and next the organic solvent containing propane diamide shown by a following equation is brought into contact with the solution by using a pulse column. In the equation, R1 and R2 are each an alkyl group of 1-15C or -(CH2)n-Z-(CH2)m-O-R4, where R4 is alkyl group of 1-6C, n and m and 1-6, Z is a single bond or an oxygen atom, R3 is hydrogen, alkyl group of 1-25C, or -(CH2)n-Z-(CH2)m-OR4. According to the method, actinides can be recovered in high yield.
KURISUCHIINU KIYUIRERUDEIE
KUROODO MUSHIKA
