基于响应面法优化同槽电积锰和二氧化锰工艺研究

Optimization of Co-Tank Electrowinning Manganese and Manganese Dioxide Processes Based on Response Surface Methodology

针对目前生产锰和电解二氧化锰行业能耗大、污染严重的问题,设计了一种同槽电沉积锰和二氧化锰工艺,在提高阴阳极电流效率的同时使得能耗最低,达到节能降耗的目的。结合响应面法对阴极硫酸铵浓度、阳极硫酸浓度、中隔室硫酸浓度、温度四个因素与阴阳极电沉积效率之间的交互作用进行分析,得到二次回归拟合模型,确定同槽电积的最佳条件为:阴极硫酸铵浓度为107.11 g/L,阳极硫酸浓度投加量为2.8 mol/L,中隔室硫酸浓度为0.516%,温度为40.2℃。阴极电流效率可达到84.79%、阳极电流效率可达到68.43%。分析表明,硫酸铵和温度对阴极电流效率交互影响最大、硫酸浓度和温度对阳极电流效率交互影响最大。电沉积得到的金属锰沉积紧密。电解二氧化锰粒径均一,形貌良好。

A manganese and manganese dioxide co-tank electrodeposition process was developed to investigate the effect of four factors by using a one-factor test,enhance cathode and anode current efficiencies,and reduce energy consumption.Response surface methods was adopted to examine the relationship among the four variables temperature,anode and cathode electrodeposition efficiency,compartment sulfuric acid concentration,and cathode ammonium sulfate concentration.A quadratic regression fitting model was developed to determine the optimal electrolysis conditions.A cathode ammonium sulphate concentration of 107.11 g/L,an anode sulphuric acid concentration of 2.8 mol/L,a septum chamber concentration of 0.516%,and a temperature of 40.2℃were the best-optimized factor combinations leading to the best cathode current efficiency of 84.79%and anode current efficiency of 68.43%.The study showed that ammonium sulphate concentration and temperature significantly impacted cathode electrolysis efficiency.In contrast,sulphuric acid concentration and temperature had the most significant impact on anode electrolysis efficiency.The electrolytic manganese metal is securely deposited,and the electrolytic manganese dioxide particles are uniformly.