Cleaning of Used Extractant with Methylhydrazine Oxalate

The preparation and stability of methylhydrazine oxalate (MHOX) are investigated. White needles of MHOX are obtained, and it's molecular formula is (CH 3N 2H 4) 2C 2O 4. The aqueous solution of MHOX is stable at ambient temperature. The washing efficiency of 30 %TBP/OK containing micro quantity of uranium is studied with MHOX. The effects of concentration of washing solution, phase ratio(A/O) and irradiation dose on the washing efficiency are investigated. The washing efficiency of uranium from 30 % TBP/OK with MHOX is as same as that with Na 2CO 3. The washing efficiencies of Pu and Am with MHOX are slightly higher than those with Na 2CO 3. The washing efficiency of Pu from CMP/TBP/OK with MHOX is slightly higher than that with Na 2CO 3, but it is obviously higher for Am. The washing efficiency in a four stage countercurrent cascade experiment is satisfied with MHOX.