电渗析选择性分离电解锰废水中的阳离子

以电解锰行业清洁化与资源化发展为目标,探究了电渗析工艺中单价选择性阳离子交换膜(CSO)对电解锰废水中的阳离子Mn2+、NH4+及 Mg2+选择性分离的效果、规律及影响因素.结果表明选择性系数PMn2+NH+4远小于1,即CSO膜能轻易实现NH4+和 Mn2+的选择性分离,保障任意时刻NH4+迁移量均远高于Mn2+.由...

Selective separation of cations of different valence during electrodialysis of electrolytic manganese wastewater

Towards cleaner production and resource utilization in electrolytic manganese industry, this work investigated the influence of monovalent selective cation exchange membrane (CSO) on separation of Mn2+, NH4+ and Mg2+ via electrodialysis (ED). PNH4+Mn2+ was found far less than 1, in line with the fact that CSO membrane realized the facile separation of NH4+ and Mn2+, maintained a much higher migration amount of NH4+ than its counterpart during the desalination period. Due to the difference of ion diffusivity in the boundary layer, the perm-selectivity of Mn2+ over NH4+decreased with the increase of current density and total ion concentration, with the former factor more significant. In the Mn2+, NH4+ and Mg2+ tertiary system, the order of sequence for the migration rate was NH4+> Mn2+> Mg2+, in consistence with the level of their corresponding ion hydration energy. Furthermore, the voltage variation which exhibted an S-shaped could be used to evaluate the migration extent of monovalent during ED process.