Abstract:The wet extraction of vanadium from vanadium shale is a multi-stage leaching process. The existing research mostly regards the leaching tank as a single closed container, which is inconsistent with the reality, and the mechanism and effect of gas blowing stirring as a new process have not been reported in detail. The flow field and phase distribution in the stirred tank with inlet and outlet were compared and analyzed by numerical simulation, and the influence of stirring mode on multiphase flow behavior in leaching tank with inlet and outlet was studied. The results show that the flow field in stirred leaching tank with or without inlet and outlet is obviously different. Under the same mechanical stirring conditions, the dead zone in the near free surface area with inlet and outlet is reduced from 3.3% to 1.8%, and the dead zone at the bottom is reduced from 1.07% to 0.46%. When the stirring mode is changed from only blowing stirring to only mechanical stirring, the flow velocity in the upper part of the top impeller rises from 0.16 m/s to 0.28 m/s, the dead zone near the free surface drops from 8.5% to 1.8%, and the proportion of the bottom dead zone drops from 2.68% to 0.46%. On the contrary, when the mechanical and gas combined stirring is used, it will affect the suspension effect of vanadium shale.