离子交换树脂性能对电去离子技术浓缩分离含镍离子溶液的影响  

INFLUENCES OF ION EXCHANGE RESINS CHARACTERISTICS ON CONCENTRATION AND SEPARATION OF NICKEL-CONTAINING SOLUTION BY ELECTRODEIONIZATION PROCESS

作　　者：王玉珍[1,2] 王建友[2] 吴志强[2] 卢会霞[2] 

机构地区：[1]西安理工大学印刷与包装工程学院,陕西西安710048 [2]南开大学环境科学与工程学院,天津300071

出　　处：《水处理技术》2015年第5期78-81,88,共5页Technology of Water Treatment

基　　金：国家高技术研究发展计划(863计划)项目(2007AA06Z330);天津市科技支撑计划重点项目(08ZCKFSH01800)

摘　　要：分别选用3种不同型号的大孔强酸强碱性阴阳离子交换树脂,采用浓缩室填充树脂的强化电去离子（EDI）过程,对低浓度Ni SO4溶液进行了浓缩分离与同步纯化。考察了树脂电阻、交换容量及含水率等性能参数对EDI分离性能的影响。研究表明,颗粒扩散控制机制对过程传质有重要影响。树脂含水率越高,Ni^2＋离子迁移越快。对于Ni^2＋离子质量浓度50 mg/L,p H=4.25的Ni SO4溶液,当填充含水率分别为50%~60%和50%~55%的混床大孔离子交换树脂时,实验范围内浓缩产品水的Ni^2＋质量浓度可达11 171 mg/L,浓缩倍数超过220,淡化出水中Ni2＋离子质量浓度则为2.78 mg/L,截留率达94.4%。实验结果表明,相对较高的树脂含水率更利于目标离子的迁移。Concentrating, separating and purifying synchronously of dilute NiSO4-containing solution was investigated by the enhanced electrodeionization （EDI） process whose dilute and concentrate compartments were all filled with ion-exchange resins. Three macroporous-type strongly acidic and strongly basic ion-exchange resins were adopted as the fillers. Influences of the resin characteristics including resistance, exchange capacities and moisture retention on the EDI separation performances were thoroughly investigated. It was found that the mechanism of particle diffusion control （PDC） played an important role on the mass transfer of the process. The nickel ion would migrate faster as the moisture retention of resin increased. For feed NiSO4 solution containing 50 mg/L Ni^2＋ ions with pH being 4.25, when packed with cation and anion exchange resins with moisture retentions of 50%~55% and 50%~60%, respectively, the Ni^2＋ concentration of concentrate product could reach 11 171 mg/L, which gave a concentrating ratio higher than 220, while that of the dilute effluent was 2.78 mg/L and the nickel rejection was 94.4%. The experiment showed that higher moisture retention of the resins could be beneficial for the migration of target ions.

关 键 词：电去离子 离子交换树脂 含水率 镍 

分 类 号：TQ028.8[化学工程] X703.1[环境科学与工程—环境工程]