Relations between Electrolytic Conditions and Efficiencies, Purity of Deposited Iron, and Voltage for Electrolysis in Ferrous Sulfate Solutions by Using Anion Exchange Membrane:Studies on Iron Electrodeposition from Sulfate Bath by Using Anion Exchange Me

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This paper describes the effects of current density on the efficiencies of iron deposition and sulfuric acid generation, and effects of catholyte conditions on carbon, sulfur, and oxygen contents of the deposit; and also relates to the voltage for electrolysis. The current efficiency for iron deposition in the catholyte of comparatively low value of pH decreased rapidly when the current density was lower than 1Amp/dm2, while the current efficiency for sulfuric acid generation in the anolyte remained unchanged at a high value when the sulfuric acid concentration in the anolyte was kept at low values.Therefore, it was possible to increase the pH value during electrolysis by employing this range of density.Carbon and sulfur contents of the iron deposit decreased with the increase of pH value of catholyte up to about 5.2. However, oxygen content of the deposit showed a minimum value at about pH=4, except for a few special cases. The purity of iron in the deposit was over 99.9%. The oxygen liberation potential on the insoluble lead anode was equivalent to 44% of the total voltage for electrolysis; and the voltage drop due to the resistance of anion exchange membrane was equivalent to about 7% of the total voltage.
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