Electrochemical Behavior of Sulfide Minerals

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  • 硫化鉱の電気化学的挙動
  • リュウカコウ ノ デンキ カガクテキ キョドウ

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The electrochemical behavior of sulfide minerals including pyrite, pyrrhotite, chalcopyrite and galena was experimentally studied by both the galvanostatic method and the potentiostatic method. The corrosion of sulfide minerals are closely related with the spontaneous polarization potential method which is one of the electrical prospecting methods and the present study is also concerned with the induced polarizatian method that recently has been in use.<BR>On the polarization curves in hydrochrolic acid, the slopes of Tafel line, b, are shown 0.11-0.16 on the anodic side in log I-E diagram, on the other hand, pyrrhotite: 0.27, chalcopyrite: 0.80, and pyrite: about 0.50 respectively on the cathodic side. These characteristics were studied in some other acidic and neutral solutions. The anodic side of pyrrhotite and galena showed the corrosing protection by the growth of the oxide films on the surface of specimens.<BR>At the corrosion tests for pyrite and pyrrhotite in hydrochrolic acid, iron was dissoluted in ferric ions from anodic specimens and in ferrous ions from cathodic ones. The corrosion efficiencies were increased sharply by the influence of spontaneous polarization currents below 20μA/cm2.<BR>Relation between the corrosion currents, i0, and the corrosing behaviors among four kinds of sulfide minerals was discussed. It was concluded that the corrosion reactions of these minerals might be controlled mainly by the cathodic polarization.

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