| Autor: |
Makhanbetov, A. B., Myrzabekov, B. E., Gaipov, T. E., Tazhibayev, A., Abduvaliyeva, U. A. |
| Předmět: |
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| Zdroj: |
Rasayan Journal of Chemistry; Oct-Dec2021, Vol. 14 Issue 4, p2202-2208, 7p |
| Abstrakt: |
We investigated the electrochemical behavior of manganese dioxide as a part of a composite electrode of manganese dioxide - graphite (MnO2+C), based on an organic polymer binder. The electrochemical behavior of manganese dioxide (MnO2) inside the composite electrode was researched by recording potentiodynamic polarization curves in a sulfuric acid solution. During the cathodic polarization of manganese dioxide in a sulfuric acid medium, a peak reduction of Mn4+ to Mn2+ was observed at a potential of +1,175 V. The obtained data led to the electrochemical leaching experiments to extract manganese from hardly soluble manganese dioxide. The experiments were carried out at room temperature in an electrolyzer equipped with a mechanical stirrer and the cathode and anode spaces separated by a PVC diaphragm. Lead was used as the cathode material, and graphite electrode was used as the anode. The cathode space was filled with an aqueous solution of sulfuric acid containing particles of manganese dioxide. We investigated the influence of the electrolysis parameters on electrochemical leaching of manganese dioxide and obtained the values of the current yield depending on the cathode current density, the temperature of the medium, the concentration of acid, the mixing intensity and the ratio of liquid to solid (L:S). The obtained data proved the possibility of direct electrochemical leaching of manganese dioxide. The maximum value of 66.8% current yield was reached at a cathodic current density of 200 A/m², 50°C temperature, and L:S ratio of 6:1, mixing speed of 200 rpm, with a one-hour duration of the experiment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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