氯化物体系单槽双室电积锰工艺研究

Study of Mn Electrowinning Process in Chloride System with Single-tank and Double-chamber

本工作在单槽双室电解槽中采用氯盐电解质进行了电沉积锰的工艺研究。初步探索了带有亚氨基二乙酸官能团的螯合树脂TP-207对高Mn^(2+)电解液中杂质离子的吸附除杂作用过程,提出了四种离子吸附模型;同时,确定了氯盐体系隔膜电积锰工艺参数,与传统硫酸盐体系和工艺进行了对比。结果表明:电解最佳条件为阴极液初始锰离子浓度(影响较小)0.9 mol/L;电解液温度越低,电流效率越高,最佳温度为5℃;阴极电流密度(影响一般)为450 A/m^(2);pH(影响很大)为弱酸性的6.5。在此最佳工艺条件下进行电解Mn时的电流效率可达83.211%,电耗最低为4022.7 kW·h·t^(-1),对应的Mn产品晶型为γ型。

The processes of manganese electrodeposition in the chloride salt electrolyte system with a single-tank double-chamber electrolyzer were studied.The process of adsorption and decontamination of impurity ions in high Mn^(2+)electrolyte by chelating resin(TP-207)with imino-diacetic acid functional group was initially explored,and four ion adsorption models were proposed.The process parameters of manganese electrodeposition by diaphragm of chloride salt system were determined.Meanwhile,it was compared with the conventional sulfate system and process.The results show that:the best condition of electrolysis is that the initial concentration of manganese ions in cathode solution(with small influence)is 0.9 mol/L,the lower the temperature of electrolyte,the higher the electric efficiency,the best temperature is 5℃,the cathode current density(with general influence)is 450 A·m^(-2),and the pH(with great influence)is 6.5 of weak acidity.The current efficiency obtained under this best process condition reach to 83.211%,and the lowest electric consumption is 4022.7 kW·h·t^(-1),the corresponding Mn product crystalline type isγ-type.