Effects of Electrolyte Conditions on Efficiencies in Electrolysis of Ferrous Sulfate:Studies on Iron Electrodeposition from Sulfate Bath by Using Anion Exchange Membrane (Part 1)

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This paper describes the iron eectrodeposition from a solution mainly composed of ferrous sulfate catholyte by using two compartment cells separated by an anion exchange membrane. In particular, it describes the effects of electrolyte conditions on current efficiencies for iron deposition on cathode and on efficiency of sulfuric acid generation in anolyte. There were close relations among the concentration of sulfuric acid in anolyte, pH of catholyte, efficiency of sulfuric acid generation, and efficiency of iron deposition. When the sulfuric acid concentration in the anolyte increased, the efficiency of sulfuric acid (generated in the anolyte passing through the anion exchange membrane from the catholyte) decreased, which led to lowering of the pH value of catholyte and also lowering of the iron deposition efficiency on the cathode. The current efficiency for iron deposition rapidly decreased when the pH value of ferrous sulfate catholyte was below 2.5. It was proposed to keep the sulfuric acid concentration in the anolyte at lower than 50g/l and to keep the pH value of catholyte at above 2.5 for the purpose of keeping the efficiency of sulfuric acid (generated in anolyte) higher and of keeping the efficiency of iron deposition (on cathode) higher.
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