Design On Heavy Rare Earth Cylinder Extraction Tank

With the continuous development of high-end industry,the demand for heavy rare earths for industrial products is increasing,but the current research is not perfect for the separation of heavy rare earths on extraction equipment.In view of this situation,an extraction equipment needs to be designed to improve the capacity of heavy rare earth separation.Taken the heavy rare earth cylinder extraction tank without front chamber as object of research,and researched the flow field characteristics and the mixing process of material-liquid in the extraction tank in depth,and carried out numerical simulation on the mixing of material-liquid in the extraction tank through the numerical computing platform,and optimized the design of the extraction tank structure,the main work is as follows:(1)In view of the shortcomings of the traditional square extraction tank in terms of material-liquid flow and mixing,proposed a model of small heavy rare earth cylindrical extraction tank without front chamber,and conducted numerical simulations of both under the same conditions,and compared and analyzed the flow field characteristics and two-phase mixing process of fluid in the mixing chamber of both,and concluded that the cylindrical extraction tank is better than the traditional square extraction tank to a certain extent.(2)The velocity field and turbulent kinetic energy of the fluid in the mixing chamber with different baffle widths were simulated and analyzed,and then the mixing process inside the chamber was simulated and analyzed.On the basis of the stable flow field,the mixing process of the fluids under three different baffle widths is simulated,and the mixing time is obtained by using the tracer method to observe the mixing of the fluids in the mixing chamber and the concentration change monitored by the monitoring points set up.It is concluded from the simulation that the addition of the baffle in the mixing chamber of the heavy rare earth cylindrical extraction tank changes the flow direction of the fluid,effectively eliminating the "Swirling" of the fluid,and the optimal baffle width in the mixing chamber of the extraction tank is derived.(3)On the basis of determining the optimal baffle width,the influence of the baffle inclination on the flow field in the mixing chamber of the extraction tank was studied in depth.The simulation results showed that the baffle and the bottom of the mixing chamber into a certain angle of inclination can effectively enhance the axial flow of the fluid,increasing the turbulent kinetic energy of the fluid,so that the fluid in the chamber has more sufficient space for flow.Under the rotation of the stirring paddle,the fluid at the bottom of the mixing chamber appears to flow to the middle or top of the cylinder,thus driving the fluid in the area between the baffle and the cylinder wall to circulate,to improve the overall mixing effect of the fluid.(4)According to the numerical simulation results,the main parameters of the mixing chamber structure of the heavy rare earth cylindrical extraction tank are determined,its design and fabrication are completed,and the equipment installation process of the rare earth extraction pilot line is briefly described,and the relevant commissioning work is completed.