电解锰阳极渣吸附硫酸锰溶液中钼的行为研究

硫酸锰溶液中重金属离子的深度净化以及电解锰阳极渣的综合利用一直是锰行业研究重点。采用XRD、SEM、EDS、FT-IR和Zeta手段对电解锰阳极渣进行表征，利用正交试验分析、Visual Minteq软件吸附模拟研究了电解锰阳极渣吸附硫酸锰溶液中钼的行为。结果表明:电解锰阳极渣主要成分为α-MnO₂，形貌为孔隙丰富的棒状结构，存在着较多的表面羟基，等电点（IEP）为3.6。反应条件对吸附行为影响主次顺序为:硫酸锰溶液pH值> 二氧化锰添加量 > 反应时间。模拟了硫酸锰溶液中Mn和Mo的离子形态随pH的变化关系，比较了不同pH下阳极渣的表面络合模拟数据与试验数据，证明了钼离子被吸附是受阳极渣表面羟基络合、表面电荷吸引以及缺陷孔隙等共同作用。为解决锰系电池原材料硫酸锰溶液中重金属离子难去除和电解锰阳极渣的合理利用问题提供一些支持。 

Study on the adsorption behavior of molybdenum in manganese sulfate solution by electrolytic manganese anode slag

The deep purification of heavy metal ions in manganese sulfate solution and the comprehensive utilization of electrolytic manganese anode slag have always been the research focus in the manganese industry. In this paper, electrolytic manganese anode slag was characterized by XRD, SEM, EDS, FT-IR and Zeta spectroscopy. The adsorption behavior of molybdenum in manganese sulfate solution by electrolytic manganese anode slag was studied by orthogonal test analysis and Visual Minteq software adsorption simulation. The results showed that the main components of electrolytic manganese anode slag were α-MnO₂, and the morphology was a rod-like structure with abundant pores. There were many surface hydroxyl groups, and the isoelectric point (IEP) was 3.6. The order of influence of the reaction conditions on the adsorption behavior was as follows: manganese sulfate solution pH > manganese dioxide addition > reaction time. How the ion forms of Mn and Mo in manganese sulfate solution changed with pH was simulated. The surface complexation simulation and experimental data of anode slag at different pH values were compared. It was proven that the adsorption of molybdenum ions resulted from the combination of the surface hydroxyl complexation, surface charge attraction and defect pores of anode slag. This would provide support for solving the problems of difficulty in removing heavy metal ions in manganese sulfate solution and the rational utilization of electrolytic manganese anode slag.