マグネシウム晒粉の電解製造における陽極消耗について (1):過酸化鉛電極の消耗

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Methods of the preparation of lead peroxide electrodes have so remarkably been improved that dense plates of low porosity are commercially available. In this study, such lead peroxide electrodes were used for the electrolytic preparation of magnesium bleaching powder (MBP), and their weight losses were measured under various anodic current densities with or without addition of sodium hydroxide into electrolyte. Also, an influence of the presence of sulfate ions on the weight loss of electrode as well as on the process of MBP formation was studied. In the case of the electrolysis with addition of sodium hydroxide (pH7.2-7.5), the anode proved insoluble, and its weight loss was chiefly caused by the formation of gas which spalled the surface of the anode mechanically. At the anodic current density of DA=0.4A/cm2, the loss showed the minimum value amounting to about 5mg/30A·hr. Even at the high current density of DA=1.6A/cm2, the loss showed only a little increase causing no hindrance to the formation of MBP. In the case of weak acidic condition (pH6.4-7.0) without addition of sodium hydroxide, the lead peroxide electrode seemed to be slightly soluble, and the anodic slime was a cause of contaminating MBP in a slight dark color. The anodic slime produced in the weak acidic electrolysis chiefly consisted of fine PbO2 powder which was less than several microns in diameter. The weight loss of the anode showed the minimum value amounting to 8.6mg/30A·hr at DA=0.8A/cm2. The yield of MBP decreased to 1/10 as compared to the case of alkaline electrolysis. When alkali was added, the available chlorine of MBP reached the maximum value of 44%, while the consumption of electric power was 6-8W·hr/g of MBP. Judging from the above consumption of electric power and electrode, the anodic current density of 0.2-0.4A/cm2 is considered the optimum.
日本海水学会の論文

マグネシウム晒粉の電解製造における陽極消耗について (1):過酸化鉛電極の消耗

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日本海水学会 | 論文

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