Study On Electrolyzing Manganese Metal And Dioxide In The Same Cell And The Transfer Mechanism Of The Electrolytes

The main objective in this paper is to research the simultaneous electrolysis of manganese metal and dioxide in the same cell, especially focuses on the study of the electrolytes'transfer mechanism in the process. The method of electrolyzing with the same anodic and cathodic temperatures is utilized in the experiments. Cyclic Voltammetry and electrolysis under constant potential/current density are used to investigate the electrodepositing of metal manganese on the cathodes of stainless steel (SS), Pb and Ti. The results indicate that the cell voltage and the cathodic deposit of using SS are better than that of using the other two materials, so the SS electrode is chosen to save as the cathode in the simultaneously electrolysis. And through comparing the phenomena of electrodepositing metal manganese in the cell with and without diaphragm, the diaphragm is found to play an important role in the depositing process of the metal. This conclusion determines that the cell with diaphragm must be employed in the simultaneous electrolysis. Furthermore, the electrodepositing of manganese dioxide on the anodes of Ti and Pb with the electrolyzing temperature varying within 40~80℃is also compared. The results show that the Ti anode is passivated badly below 70℃, the electrolysis is difficult to last for enough time and the anodic efficiency is low. But when Pb anode is employed, the anode efficiency is higher and the cell voltage keeps low and steady. So the Pb electrode is chosen to be the anode for the simultaneous electrolysis. After the experiments mentioned above, X-ray diffraction (XRD) is utilized to authenticate the target produces and inspect their structures and compositions.The effects of the pH value and electrolyzing temperature on the electrodepositing of metal manganese are also studied. It is concluded that the value of pH is actually the determinant to the cathodic efficiency and the range of it that could be chosen for the electrolysis is limited. At the same time, data concerning the influence of the temperatures on the metal's depositing is put together with that obtained in the experiments of electrolyzing manganese dioxide on Pb anode within 40~80℃, to make the decision for the temperature of simultaneous electrolysis. The curves show an intersection point between 50℃and 55℃, and the cathodic efficiency on SS cathode and anodic efficiency on Pb anode are both sensitive to the change of temperature when it is below 65℃and close to a linear decrease and increase respectively; but when the temperature rises above 65℃, the two tendencies become much milder. Finally 50℃is...