The reaction linetics of UF6+HX(HX=HCl, HBr and HI) has been studied. It was found that the reaction rates of UF6+HX increased with the sequence from HCl to HI, for example, the rate constants were 2.32×10^-^6, 6.43×10^-^4 and 5.89×10^-^3s^-^1.Pa^-^1 at room temperature, respectively. The apparent activation energies of the reactions of UF6+HCl and UF6+HBr were 11.29 and 4.18kj/mol, respectively. The increase order of the rates and the decrease order of the apparent activation energies are consistent with the decrease in the bond energy of HX with the sequence from HCl to HI.

Key words: REACTION KINETICS, ACTIVATION ENERGY, REACTION RATE CONSTANT, URANIUM FLUORIDE, HALOGEN HYDRIDE