聚合物强化超滤法分离镧和铕离子稀土废水  

Separation of Rare Earth Wastewater Containing La^(3+) and Eu^(3+) by Polymer Enhanced Ultrafiltration Method

作　　者：陈桂娥[1] 阎剑[1] 张海滨[1] 许振良[2] 

机构地区：[1]上海应用技术学院化学工程系,上海200235 [2]华东理工大学化学工程研究所,上海200237

出　　处：《华东理工大学学报（自然科学版）》2007年第2期167-171,共5页Journal of East China University of Science and Technology

基　　金：上海市高校科学技术发展基金(02HK04);上海市重点学科建设资助项目(P1501)

摘　　要：采用经过预处理的聚乙烯基亚胺(PEI)为聚合物络合剂,探讨了pH、装载量比(L)、离子强度、PEI浓度等对聚合物强化超滤过程的影响。结果表明:采用PEI为聚合物络合剂,pH=2.5时,每毫克PEI对Eu3+络合容量为0.5 mg;pH、L对稀土离子的截留率影响趋势相同;溶液中的含盐量对稀土离子的截留率有一定影响;在体积稀释因子(VDF)为3时,恒容超滤过程可以回收92%以上的PEI,将回收后的PEI重新用于聚合物强化超滤过程处理稀土离子废水,效果与新鲜的PEI没有明显差别。在大量的La3+存在下,络合剂PEI对La3+/Eu3+混合溶液中Eu3+的截留率影响甚微。因此,可用聚合物强化超滤法选择性分离出La3+/Eu3+混合溶液中的镧和铕离子。Using the pretreated polyethyleneimine （PEI） as a polymer complexant, the effects of loading ratio （L）, ion strength and PEI concentration on polymer enhanced ultrafiltation process of pH, rare earth wastewater containing La^3＋ and Eu^3＋ were discussed. Under pH=2.5, the complexation capacities of PEI to Eu^3＋ was 0.5 mg/mg, pH and L had the similar trend on the retention of rare earth ions. The salt concentration in rare earth wastewater had the effect on the retention of rare earth ions. Under the volume diluted factor VDF=3, the recovery efficiency of PEI was more than 92% in the constant volume ultrafiltation process. The recovered PEI was reused for polymer enhanced ultrafiltation process of rare earth wastewater containing La^3＋ and Eu^3＋ and its recovery efficiency was the same as the fresh PEI. The retention of Eu^3＋ for La^3＋/Eu^3＋ mixtu tion. Therefore, La^3＋ and Eu^3＋ might Key words, polymer enhanced ultr re solution be selective afiltration ; almost was not affected under the high La^3＋ concentraly separated by polymer enhanced ultrafiltation method.

关 键 词：聚合物强化超滤 稀土离子 聚乙烯基亚胺(PEI) 

分 类 号：TQ028.8[化学工程]