Control Factors of Electrolytic Manganese and Particulate Electrolytic Manganese Dioxide in Double-membrane Three-chamber Electrolyzer
XU Qi1, WANG Sanfan1, SUN Baichao2
1 Engineering Research Center of Water Resources Utilization in Cold and Drought Region, Ministry of Education, School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2 China Construction Steel Structure Corp. LTD, Shenzhen 518000, China
Abstract: Double-membrane three-chamber electrolysis method was used to electrolyze manganese and particulate electrolytic manganese dioxide in the same tank, and the middle compartment was used to recover sulfuric acid.The effects of Mn2+ concentration, current density, electrolysis temperature, cathode (NH4)2SO4 concentration and anode H2SO4 concentration on electrodeposition were investigated.The results showed that:when the concentration of Mn2+ in the catholyte was 40 g/L, the initial pH is 6.9, the concentration of (NH4)2SO4 in the catholyte was 110 g/L, the cathode current density was 400 A/m2, the concentration of Mn2+ in the anolyte was 40 g/L, and the concentration of H2SO4 in the anolyte was 2.5 mol/L, the anode current density was 800 A/m2, the pole spacing was 90 mm,the electrolysis temperature was 45 ℃, and the electrolysis time was 5 h, the cathode current efficiency reached 77.53%, the energy consumption was 6 725.28 kW·h/t, the anode current efficiency reached 84.87%, the energy consumption was 3 883.91 kW·h/t, and the acid recovery rate reached 63.2%.The surface of manganese metal is smooth and flat, and the grains are blocky and stacked in layers.The particulate electrolytic manganese dioxide particles are fine,the particle size distribution is uniform, and the crystal morphology is relatively regular.
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2020, Vol. 34 
