Study On Optimization Of Anode Structure And The Consumption Of Anode Corrosion In Rare Earth Electrolytic Cell

The graphite anodes used in the electrolysis production of rare earth electrolysis enterprises are vertical cylindrical shapes.Such anodes have a fast consumption rate,a short effective use time,and a large amount of residual waste,and due to the anode consumption during the electrolysis process,the physical Problems such as unreasonable field distribution.Therefore,the improvement and optimization of the anode structure has high theoretical significance and practical application value to reduce the anode residual waste and reduce the production cost,improve the anode replacement cycle and the electrolytic cell electrolysis efficiency.This thesis takes the 8kA rare earth electrolysis cell of an enterprise as a prototype,based on the existing electrolysis cell structure,based on the electric field theory,heat and mass transfer theory and secondary current electrochemical corrosion theory,using an auxiliary simulation design platform for the anode structure parameters For optimization,the specific research content is as follows:(1)The anode corrosion consumption process in the actual rare earth electrolysis cell electrolysis process,analyze the shape change that occurs after anode corrosion consumption,combine the production data to analyze the impact of anode consumption on the production of rare earth metals,and analyze the mechanism of anode consumption.(2)Using the finite element analysis method,a three-dimensional electric field model of the rare earth electrolysis cell was established,and the distribution results of the three-dimensional electric field in the rare earth electrolysis cell were simulated,and the effects of anode consumption and different anode structures on the three-dimensional electric field distribution were analyzed.The anode full tilt angle ? and half tilt angle ? were optimized.At the same time,the anode insertion depth h was further optimized.Two anode tilt angle and insertion depth parameters with reasonable electric field distribution were obtained.combination.(3)The electro-thermal coupling model is established,the simulation results of the distribution of the thermal field in the electrolytic cell are analyzed,and the effects of anode consumption and different anode structures on the three-dimensional thermal field distribution are analyzed.The simulation results show that the optimized two sets of anode structures are adopted,and the electrolysis temperature in the electrolysis cell is within the range of theoptimal electrolysis temperature,which verifies the rationality of the combination of the two anode structure parameters.(4)Based on the optimization of the anode structure,a secondary current electrochemical corrosion model was established,and the electrochemical corrosion transient simulation of the electrolytic cell electrolysis process was carried out to obtain the corrosion behavior of the anode during the electrolysis process,and the simulation results were found It is in good agreement with the actual production data,which verifies the correctness of the model.At the same time,it was found that the optimized anode structure can extend its effective use time,and the replacement sequence of diagonal anodes can improve the anode's wear resistance.