발간논문

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Vol.17, No.3, 221 ~ 231, 1979
Title
Electrowinning of manganese Dioxide
김희진Hee Jin Kim, 이동녕Dong Nyung Lee, 박평주Pyung Choo Park
Abstract
A study has been made of electrowinning of manganese dioxide using a titanium anode. The electrolysis conditions such as concentrations of manganese ion and sulfuric acid, current density, electrolysis temperature and time, and surface roughness of anode have been examined, laying an emphasis on their mutual relationships and their effects on the current efficiency. The current efficiency was found to be decreased with increasing concentration of sulfuric acid. The optimum current density was 1-1.5A/d㎡. The effective electrolysis time increased with increasing concentration of manganese sulfate and decreasing concentration of the sulfuric acid. It was also important to raise the temperature above 90℃ in order to continue the electrolysis for a long time. It was observed that the anode potentials and bath voltages increased sharply when the deposited manganese dioxide layer stripped partially from the titanium anode. These phenomena were discussed based on the development of residual stresses in manganese dioxide deposits and anodization of the titanium anode.
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