Study on Ion Membrane Electrolysis of Lithium Hydroxide from Lithium Sulfate
The cleaning process toward electrosynthesis of lithium hydroxide based on ionic membrane is designed in this paper.The electrochemical synthesis of lithium hydroxide was completed by using lithium sulfate refining solution as anolyte and lithium hydroxide solution as catholyte.The cathode current effi-ciency and unit lithium hydroxide product power consumption were used as indicators to systematically in-vestigate the electrosynthesis conditions and optimize the parameters.The effects of initial concentration of anolyte and catholyte,cycle speed,reaction temperature and current density on the electrolytic conditions were studied,and the optimized experimental parameters were obtained and verified.The experimental re-sults show that when the concentration of anolyte is 200 g/L and catholyte is 25 g/L,the cycle speed is 350 r/min,the reaction temperature is 70℃and the current density is 1 730 A/m2,the electrolytic system has good per-formance.It is verified that under the optimized parameters,the current efficiency of lithium hydroxide is 72.64%,the power consumption of unit product(100%lithium hydroxide solution)is 5 975 kWh/t,and the purity of evaporative crystallization product is 56.7%,which is up to the standard of GB/T26008-2020 battery grade lithium hydroxide.The preparation of lithium hydroxide by ion membrane electrolysis has the merits of high purity,controllable reaction process,high degree of automation,small by-product emis-sion,high economic value and has broad application prospect.
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