Research of fluidized medium treatment

The activity coefficient of uranium fluoride in fluoride was determined by a cyclic voltammetry and equilibrium potential measurement. The kind of uranium compound in NaF-AlF3-Al2O3-F4 system was determined by the cyclic voltammetry. With reducing from U(3) to U(0) by the reduction reaction during uranium precipitation, the activity coefficient of UF3 in cryolite fused salt with uranium metal and uranium fluoride was measured by the electron motive force (EMF) method. The results showed that the redox potential of uranium is almost same value of aluminum, so that, both uranium and aluminum are collected by electrolytic recovery, because the concentration of aluminum is higher than uranium in the fused salt. It is necessary to add the after-treatment such as distillation. Alumina was soluble in fluoride molten salt and oxidized uranium fluoride to uranium oxide. The results showed separation and collection of uranium is possible, because uranium oxide was not soluble and precipitated in fluoride molten salt. (S.Y.)