Research On Antechamber Structure Of Extraction Tank

The structure of the extraction tank has been improved in the metallurgy,medicine and many other industries.After the simple box-type mixer-settler,the EC-D mixer-settler,double-mixing mixer-settler and double-stirring mixer-settler,which have high mixing and clarification efficiency have been applied.However,the domestic and foreign scholars focused on the optimization of the mixing chamber and the settling chamber,and paid little attention to antechamber when they researched on the structure extraction tank.The antechamber is a cuboid cavity underneath the mixing chamber.It can buffer the material coming into the mixing chamber and increase the combination duration between heavy and light phase.This paper uses the FLUENT software to analyze the influence of antechamber structure on suction force,two-phase mixing rate and mixing efficiency.The work is summarized as followed:We take the four mixing chambers of different antechambers as research objects,to simulate the mixing process of water and P507 in the condition of continuous inflow and outflow of mixing chamber.Use the suction force,mixing efficiency and mixing energy per volume as evaluation indicators to solve the velocity fields and pressure fields and concentration fields about the four kinds of antechamber structure of mixed chamber.In order to analyze the influence of antechamber structure on mixing effect.It turned out that clapboard antechamber mixed the,with minimum suction force and pumping velocity.And pipeline mixing chamber had maximum mixing rate and suction force,also had minimum mixing energy per volume.Mixing chamber without clapboard had better mixing effect.The company changed the clapboard type extraction tank to the non clapboard type extraction tank,considering the mixing effect and the remake cost.The good test results had been achieved.But the experiment shows that if the impeller has low insertion depth,the material in antechamber will rotate with the impeller.The result made the material not conducive to suction.Also found that the water will cross into organic phase pipeline when the entrance pressure of heavy phase is large.And the material flow in the two stage extraction tank connected by the 90 angle elbow is very small.This paper focuses on the problems found on the mixing chamber without clapboard to further improve.Determining the insertion depth of the impeller and two stage pipeline connection type is elliptic tube,by means of numerical simulation and experiment.Because of the remake cost,the pipeline mixing chamber has not been chosen by the company.But it is also the best antechamber structure.In this paper,the structural dimensions are optimized.The suction force and stirring power as evaluation indexes to solve the velocity field of two-phase material mixing.The results show that the impeller has lower power loss and maximum suction,when the insertion depth is 55 mm,the suction aperture is 90 mm and the stirring speed is between 260 rpm and 340 rpm.