Electrolytic Cell For Preparation Of Al-Cu-Y Alloy In Fluoride Salt System Electric Field–Flow Field Simulation

Molten salt electrolysis is one of the most commonly used methods for the production of rare earth metals and their alloys.Research and practice have proved that the physical fields in the electrolytic cell,such as the flow field and electric field,have an impact on the stability of actual process production,product quality and production efficiency.Vital.To this end,this paper uses the simulation calculation software Comsol to simulate the electric field,temperature field and flow field in the rare earth electrolytic cell,find a suitable physical field coupling method,calculate the mutual influence between the physical fields,and obtain a physics that is more in line with actual production.Field distribution,and finally the temperature measurement of the electrolytic cell in actual production,in order to verify the accuracy of the simulation calculation of the temperature field in this article.First,the electric field distribution is studied.The research shows that when the electrode insertion depth and anode thickness increase,the voltage of the electrolytic cell decreases,and the current density inside the cathode and anode also decreases.The thickness of the anode is initially selected to be 70 mm,and the anode and cathode are preliminarily selected.The insertion depth is from 360 mm,440mm to 440 mm,520mm,the cell voltage is reduced from 11.136 V to 9.345 V,the anode current density is0.025A/cm2 ? 0.16A/cm2,and the cathode current density is 0.25A/cm2 ? 1.75 A /cm2.Based on the basic principles of heat transfer,the temperature field model of the rare earth molten salt electrolysis cell is established.The calculation results show that:when the electrode insertion depth and anode thickness increase,the overall temperature of the electrolysis cell decreases;when the anode thickness is controlled to70 mm,the anode The insertion depth of the anode and cathode is from 360 mm,440mm to 440 mm,520mm,and the overall temperature in the electrolytic cell drops from1057°C to 967°C;combined with the electric field distribution,the best electrolytic cell electrode structure is: anode thickness 70 mm,anode and cathode The insertion depth is400 mm and 480 mm respectively.At this time,the maximum temperature of the electrolytic cell is 997°C,the minimum temperature is 897°C,and the average temperature is 935°C.The temperature distribution is uniform and reasonable.After calculating the heat balance of the electrolytic cell,the electrolytic cell Qin?Qout is at this time,and the heat balance is reached.Comparing and calculating whether the electrolyte liquid surface is a free surface,the calculation results show that when the electrolyte surface fluctuation is not considered,the flow field finally stabilizes,the anode gas moves to the electrolyte surface and the velocity reaches the maximum 4.293m/s,and the electrolyte is in The area between the electrodes has the strongest flow;when considering the fluctuation of the electrolyte surface,the flow field in the electrolytic cell is a dynamic physical field,and its distribution changes over time.Using the physical field coupling function of Comsol software,the influence of the flow field on the electric field distribution and the influence of the temperature field on the flow field were simulated and calculated.The calculation results show that the voltage in the electrolytic cell changes from 10.1V to 10.8V,and the cell voltage increases by 0.7V.,The distribution of equipotential lines in the electrolytic cell changes,the upper electrode potential is slightly greater than the lower electrode potential,and the potential in the electrolytic cell rises from 9.85 V to 10.55V;the maximum flow rate of the electrolyte due to non-isothermal flow is only 0.03m/s,so the temperature field The impact on the flow field is negligible.The internal temperature of the rare earth electrolytic cell in actual production was measured.Compared with the calculation result of the temperature field,it was found that the distribution law was almost the same,and the temperature field calculated by the simulation had certain authenticity.