Abstract: Mixing time and stirring power in the mixing room of a new type extraction tank were simulated by CFD software FLUENT 120， in which the realizable k-ε turbulence model and the Eulerian multiphase flow model were selected， the interphase drag coefficient was determined by using MorsiAlexander model， the sliding mesh method was used to process the rotation area of the blade. The results showed that with the increasing of agitation speed， the power consumption increases and the mixing time of liquidliquid system is reduced. When stirring speed was over 400r/min， the power increases continually and the mixing time does not change obviously.

Key words: efficient extraction tank, mixing time, power, numerical simulation, liquidliquid twophase flow