双膜三室电沉积金属锰联产EMD的离子传输过程

Ion transport process of double-membrane three-chamber electrodeposited metal-manganese co-production EMD

针对传统单槽电解金属锰或二氧化锰存在能耗高、资源利用率低、环境污染严重等问题,提出双膜三室电解法实现阴极电沉积锰同时阳极联产电解二氧化锰,中隔室电化学再生硫酸。通过分析各隔室离子浓度变化,探究双膜三室电解法技术可行性,并对比三种离子交换膜对电沉积效果的影响。结果表明:双膜三室电解法电沉积金属锰同时联产电解二氧化锰可以实现,并且阴极电流效率可达80%以上,阳极电流效率可达60%以上,中隔室酸回收率高于65%;与Ionsep-HC、LANRAN-AM相比,TRJM-10W均相膜槽压最低,电解12 h后,阴极电流效率为86.25%,阳极电流效率为70.6%,中隔室酸回收率可达73.08%,但阴极液pH增幅最大,中间液Mn^2+浓度最高。

In view of the problems of high energy consumption,low resource utilization and serious environmental pollution in the traditional single-slot electrolytic manganese or manganese dioxide,this work proposed a double-membrane three-chamber electrolysis method to achieve cathode electrodeposition of manganese while the anode was co-produced with electrolytic manganese dioxide,and the intermediate compartment electrochemically regenerated sulfuric acid.By analyzing the changes of ion concentration in each compartment,the feasibility of double-membrane three-chamber electrolysis was explored,and the effects of three ion exchange membranes on electrodeposition were compared.The results show that the double-membrane three-chamber electrolysis method can realize the electrodeposition of manganese metal and the simultaneous production of electrolytic manganese dioxide,and the cathode current efficiency can reach more than 80%,the anode current efficiency can reach more than 60%,and the acid recovery rate in the middle compartment is higher than 65%.Compared with Ionsep-HC and LANRAN-AM,the TRJM-10W homogeneous membrane has the lowest cell voltage.After 12 hours of electrolysis,the cathode current efficiency is 86.25%,the anode current efficiency is 70.6%,and the intermediate compartment acid recovery rate is 73.08%.However,the pH value of the catholyte increases the most,and the concentration of Mn^2+ in the middle compartment is the highest.