Production of concentrated rhenium acid by electrodialysis of rhenium salts solutions

Effects of current density, temperature, rhenium concentration in initial solution, flow rate of initial solution in the demineralization chamber on rhenium acid concentration in a seven-chambered electrodialyzer with ionite heterogeneous membranes have been studied during the process of electrodialysis. It was determined that the optimum conditions of the process of rhenium acid concentration by electrodialysis of ammonia and potassium perrhenate solutions are the following: 300 A/m2 current density, 50°C solution temperature in the electrodialyzer, 35¯40 g/L rhenium concentration in initial solution, 0.67¯0.83 volume of chamber/min flow rate of initial solution in the demineralization chamber. Concentration of rhenium acid in these conditions is 300 g/L and higher.