| The polarograms were prepared to investigate the electrode kinetics concerning with the formation of electrolytic manganese dioxide, by using the cell of platinum point anode, platinum crucible cathode and manganese sulfate solution. And further, the current potential curves of electrolysis were made by the galvanostatic method. The experimental results indicated that the electrode reaction was single oxidation process and at least 90℃ of bath temperature was necessary to restrain the evolution of oxygen. The parameters of electrode reaction, transfer coefficient and exchange current, were 0.098 and 3.0×10^(-4) amp per ㎠ respectively. As a result, the rate determining process was not the charge transfer but the hydrolysis process forming the manganese dioxide. The current efficiency become higher as the Mn^(++) concentration increased and when current density was lower than 1 amp per d㎡. The results obtained in the electrolytic oxidation of refined MnSO₄solution which was prepared from domestic Rhodochrosite ores as a starting material reached to the same conclusion as was seen in polarographic studies. |
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