Abstract:Stirring leaching tank is main operation unit in wet leaching section of vanadium shale, but there exist some problems in industrial production, such as uneven distribution of solid phase, easy deposition at the bottom of tank for minerals and so on. By changing number of blade layers, blade layer spacing and bottom height of the lower pitch for double propeller, combined with computational fluid dynamics software FLUENT, distribution characteristics of velocity field and concentration field of particles at different radial and axial positions were simulated and analyzed. The results show that increasing number of agitator layers can effectively reduce concentration gradient in leaching tank and promote full mixing between solid and liquid. Increasing double blade layer spacing can alleviate problem of lower fluid velocity upper part of leaching tank. The layer spacing at 0.33D~0.53D is mainly "merging flow", which is more beneficial to strengthen contact collision between solid and liquid phase and full mixing in the region between blades. When the height of the lowest blade of double propeller is 0.13D~0.23D, the axial velocity of particles at bottom of tank is strengthened, so as to effectively alleviate problem of mineral particles deposition at the bottom of tank and promote effective dispersion of solid particles.