Electrolyzing MnO₂ And Mn In The Same Cell In The Chlorine Salt Medium

In order to solve the low current efficiency and high energy-consumption the simultaneous electrolysis of manganese metal and dioxide in the same cell, the simultaneous electrolysis of manganese metal and dioxide in the same cell was studied in this paper. Through contrast experiments,using electricity chemistry methods, such as constant potential,current density, cyclic voltammetry and line scanning, which provided experiment basis for the simultaneous electrolysis of manganese metal and dioxide in the same cell chosen the electrolyte , electrode material and electrolysis cell. The surface morphology and the crystal structure of manganese and manganese dioxide electrodeposits are analyzed by scanning electron microscope (SEM) and powder X-ray diffraction spectrometer (XRD), respectively. Cathode anode room current density, pH, concentration of manganese ion and concentration of ammonium chlorination to the influence of simultaneous electrolysis was studied in this paper by orthogonal experiments.The anode current efficiency and the cell electric voltage in chlorine and sulfate electrolysis was studied respectively in this paper, which provided an experiment basis for simultaneous electrolysis chosen the suitable electrolysis. Through contrast experiments, it was found that the current efficiency in chlorine electrolysis is higher than that in sulfate electrolysis below 65℃; Under the same temperature, the beginning cell electric voltage in chlorine electrolysis is lower than that in sulfate electrolysis, the cell electric voltage grow to 10 V consuming more time; under the same experiment condition ,the temperature of reaching the stable cell electric voltage in chlorine electrolysis is lower than that in sulfate electrolysis. Consequently chosen chlorine electrolysis as the same cell electrolysis.Through contrast experiments, it was found that the current efficiency of the electrolysis manganese dioxide is almost the same titanium ruthenium plank and titanium plank as anode in chlorine electrolysis. But titanium ruthenium as anode have low and stable cell electric voltage. So chosen titanium ruthenium as anode in chlorine electrolysis. Through contrast experiments, it was found that deposition manganese is high pure degree on the stainless, but the deposition on the titanium is imply impurities, so chosen the stainless steel as cathode in the same cell electrolysis.For choosing suitable electrolysis cell, membrane's effect for the electrolysis manganese and the manganese dioxide by cyclic voltammetry and constant current density was studied in this paper. The result discovered membrane is beneficial for deposition manganese. So chosen membrane cell in simultaneous electrolysis.After choosing electrolyte, electrode materials, electrolysis cell, the influence of the time to the same cell electrolysis manganese and manganese dioxide under the same anodic and cathodic temperatures was studied in this paper. The results indicated cathode anode room pH changed with time variety, but the pH variety trend was not corresponding with current efficiency . Because the experiment adopt electrolysis immovability, time of variety response ion density of variety. The experiments' results showed that theηis not only closely related to pH, but very closely contact with other ion densities.Current density, pH, concentration of manganese ion and concentration of ammonium chlorination to the influence of cell potential, current efficiency and energy consume of simultaneous electrolysis manganese and dioxide manganese was studied in this paper. Through a analytical of the experiment result, chosen an excellent experiment condition for electrolysis, namely C_Mn²⁺,A took 1.0mol/L,pH_A took 1,JA took 50 A/m^-2,C_Mn²⁺,C took 0.9 mol/L,CNH₄⁺ took 1.8 mol/L,pH_C took 7,J_C took 250 A/m^-2. Constant current electrolysis for 2 hour under the experiment condition, the experiment result: U=3.60v,η_A=90.07%,W_A=2464kWh/t,W_C=3794kWh/t,η_C =92.56%.