Improvement of Ruthenium Decontamination in Uranium Purification Cycle With Monomethylhydrazine

Influences of monomethylhydrazine (MMH) or hydrazine concentration, acidity, temperature on decontamination of ruthenium (Ru) were investigated in this study. The cascade experiments simulated 2D contactor of uranium purification cycle indicate that the pretreating effect of MMH or hydrazine is obvious, and the value of decontamination coefficient (DF_Ru) increases by 10 times compared with that of the experiments without the application of MMH or hydrazine. Under the same condition, MMH is more effective than hydrazine. The bench-scale mixer-settler test demonstrates that the value of DF_Ru achieves 10⁴.