Studying the Effect of Compounds in the Manganese Composites on Manganese Electrolysis by Voltmeter-Ammeter Method

Author(s): А. B. Makhanbetov, A. B. Baeshov, B. E. Myrzabekov and A. N. Tabylganova

In this paper, the reduction of Mn(II) ions on titanium electrode in neutral medium was studied through voltmeter-ammeter method. In the medium mentioned above, reduction potential of Mn(II) ions was determined by cathode-anode cyclic polarization curve. The result of voltmeter-ammeter method enables us to investigate the effect of manganese compositions in the industrial solutions on magnesium electrolysis. The effect of the compounds in the industrial solution (Co, Ni, Cu, Fe) on the decrease of ultrahigh voltage with hydrogen release was found by potentiodynamic polarization curves. On the potentiodynamic polarization curves of various concentrations of zinc ions (10, 20, 30, 40 mg/dm3 ), – 1280 mV – 1300 mV potential discharging current can be seen in cathode area. To measure this potential discharging current cathode-anode cyclic polarization curve was illustrated. On the anode region, reoxidizing current of the reduced zinc was measured to be +980 and +1200 mV on the surface of the electrode. It was found that more zinc (II) ions than 10 mg/dm3 might contaminate the cathodic manganese. Among the compounds, which were investigated in our study, little amount of cobalt ions decrease sharply the yield of electric of Mn(II) discharging ions on cathode. Only 8 mg/dm3 of cobalt ions in the electrolyte shift the separation potential of hydrogen from – 1600 mg/dm3 to – 1580 mg/dm3 . Such declining the overpotential of hydrogen release sets a limit to reduction of manganese cathode.

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