Abstract:Numerical simulation of leaching process of manganese ore with SO2 gas as reductant was carried out by CFD software, and the strengthening effects of rigid single impeller, rigid double impeller and rigid-flexible combination impeller on gas-solid-liquid three-phase mixing were compared. By analyzing the cloud images of solid phase and gas phase concentration, effects of three stirred reactors with different structural configurations on suspension of solid particles and dispersion of gas were compared. The macroscopic, mesoscopic and microscopic mixing properties in the stirred reactor were compared and analyzed through the axial and longitudinal velocity, turbulent kinetic energy and turbulent kinetic energy dissipation rate. The results show that there is no particle agglomeration and uneven gas dispersion in the flow field of rigid-flexible combined propeller, and the effect on particle suspension and gas dispersion in the upper part of flow field is obviously stronger than that of the uniaxial single propeller and the uniaxial double propeller. The macroscopic, mesoscopic and microscopic mixing performances of combined impellers are better than those of uniaxial single impeller and uniaxial double impeller.