Bench-scale electrowinning of electrolytic manganese dioxide was carried out using the manganese sulfate electrolyte generated through SO₂ leaching of low-grade ferruginous manganese ore. The effect of different electrowinning process parameters on the current efficiency and specific energy consumption was studied. Results indicated that the current density, electrolyte temperature, and free acid concentration of electrolyte have a strong effect on the current efficiency and specific energy consumption. An electrolyte temperature of 90 ± 2 °C, current density of 9 mA/cm², anode-to-cathode distance of 3 cm, electrolyte’s initial pH of 6, and free acid concentration at 15 to 20 g/L were found to be the optimum conditions for EMD electrowinning. Under the optimized electrowinning conditions, a current efficiency of 93 pct and specific energy consumption of 1.4 kWh/kg EMD were realized. The produced EMD deposit was found to have a purity of 92.4 pct and a γ crystal structure.

采用低品位铁锰矿SO ₂浸出产生的硫酸锰电解液进行电解二氧化锰的小型电解沉积。研究了不同电积工艺参数对电流效率和单位能耗的影响。结果表明，电流密度、电解液温度和电解液的游离酸浓度对电流效率和比能量消耗有很大影响。电解液温度为 90 ± 2 °C，电流密度为 9 mA/cm ²发现，阳极到阴极的距离为 3 cm，电解液的初始 pH 值为 6，游离酸浓度为 15 至 20 g/L 是 EMD 电解沉积的最佳条件。在优化的电解沉积条件下，实现了 93% 的电流效率和 1.4 kWh/kg EMD 的比能耗。发现产生的 EMD 沉积物具有 92.4 pct 的纯度和γ晶体结构。