Simulation Of Electric Field Cyclone Synergistic Enhancement Of Electronically Controlled Ion Adsorption Process

Salt lakes are rich in lithium,about 66 percent of the world’s total.Lithium extraction from salt lake is a hot research topic in recent years.Electronically controlled ion exchange technology(ESIX)can recover low concentration lithium ions in salt lakes by changing the current to regulate the reaction of functional materials,and the recovery efficiency is less disturbed by heterions.ESIX is a new separation technology with great potential for clean and efficient extraction of lithium ions in salt lake brine.The recycling process does not produce secondary pollution and has good social and environmental benefits for the ecologically fragile plateau salt lake.In this paper,a transit-reaction model in solution phase and membrane phase was constructed for the electronically controlled ion adsorption process,and the adsorption effect of lithium ions under different structures and operating conditions was studied.The main work is as follows:(1)Coupled with the interfacial reaction model of electrically active particles and the mass transfer model within particles,the selective adsorption process of Lithium ions on Li Mn2O4 electrically active functional materials was described.For the reaction parameters,such as current characteristics and ion transfer number,which were not provided in the experiment,the parameterized scanning method was used to summarize and conclude,and the transfer-reaction model which could better predict the selective adsorption performance of lithium ions was established.Based on this,the influence of operating conditions on the adsorption performance of lithium ions was studied.(2)The influence of solution flow state on the selective adsorption performance of lithium ion was explored.V2 F turbulence model was used to compare and analyze the characteristics of solution velocity and wall ion concentration in dc,single-outlet cyclone and double-outlet cyclone structures,and the main mechanism and effect of cyclone strengthening adsorption process were summarized.Among the three structures,the twin-outlet cyclone structure is more advantageous.(3)On the basis of the transaction-reaction model,the effect of double electric layer phenomenon on the transfer and strengthening of free moving ions in the membrane was added,and the adsorption model of double electric layer electrically controlled ion membrane was initially established.The ion concentration and flux in the flow channel and membrane were analyzed,and the effect of double electric layer on ion transfer was described.By analyzing the distribution of current in the membrane and the reaction behavior,the change of current and reaction current in the double electric layer at constant potential and its influence on the adsorption process were described.