Abstract:The stirring flow field in stirred tank for potassium fluotantalate sodium reduction was simulated by standard k-ε turbulent model, Eluer-Eluer model and sliding grid method based on FLUENT software. Effects of different rotational speeds and types of impeller on dispersion characteristics and flow field of liquid sodium-molten salt were studied. The simulation research shows that for the adopted two types of impeller, the liquid sodium is only locally distributed on surface of mixed molten salt. Both the straight-blade impeller and folded-blade impeller induce four circulating flow areas in stirring tank, and there is a stirring dead zone in the area near stirring shaft. The dispersion area of liquid sodium in liquid surface drops with the increase of rotation speed, and the depth of molten salt along stirring shaft rises with the increase of speed. Under the folding propeller model, with the increase of impeller rotation speed, the velocity of flow near liquid surface rises, and the velocity is symmetrically distributed along the X-axis direction when using the folded-blade impeller.