STUDIES ON EXTRACTION PROPERTIES OF DRDECMP-TBP/KEROSENE Ⅱ EXTRACTION OF ACTINIDES LANTHANIDE FROM NITRIC ACID SOLUTION

The properties of DRDECMP TBP/kerosene for the extraction of Am 3+ ,Gd 3+ and UO 2 2+ have been studied. The results are as follows:(1) D (Am 3+ ), D (Gd 3+ ) and D (UO 2 2+ ) increase with an increasing concentration of DRDECMP or HNO 3 in aqueous phase, decrease with increasing concentration of aqueous Gd 3+ or with an raising temperature. Increasing concentration of TBP can slightly decrease D (Am 3+ ) and D (Gd 3+ ) but increase D (UO 2 2+ ). D (UO 2 2+ ) can be effectively decreased by H 2C 2O 4 at low concentration of HNO 3.(2) The low D (Am 3+ ) and D (Gd 3+ ) in low HNO 3 concentration are advantageous for their stripping by dilute HNO 3. The complexing effect of H 2C 2O 4 is advantageous for the stripping of UO 2 2+ . (3)The extraction property of DRDECMP is very similar to that of DHDECMP, but the price of DRDECMP is lower than that of DHDECMP, so it is a very promising extractant for extracting actinides from HLLW.TUDIES