In pyroprocessing, most of uranium is separated from used nuclear fuel by depositing at a solid electrode of an electrorefiner. In the present study, a model, incorporating both diffusion and reaction kinetics of electrorefining, is developed. The model is applied to conduct parametrical studies on uranium deposition at an inert solid electrode to investigate properties of uranium deposition and dissolution and their dependence on the operating conditions. Both linear potential sweep and cyclic voltammetry processes are considered.