倒极电去离子过程浓缩分离含镍离子溶液  

Concentration and separation of nickel-containing solution by electrodeionization with polarity reversal

作　　者：王玉珍[1] 王建友[1] 卢会霞[1] 王少明[1] 董恒[1] 

机构地区：[1]南开大学环境科学与工程学院,天津300071

出　　处：《化工学报》2010年第10期2688-2693,共6页CIESC Journal

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

摘　　要：通过在电去离子(EDI)的淡化室和浓缩室中同时填充离子交换树脂而构成频繁倒极电去离子(EDIR)过程,用以解决处理含重金属离子溶液时EDI内部易产生金属氢氧化物结垢的关键难题。以NiSO4溶液为处理对象,采用浓缩水部分循环和浓、淡水流分步切换的运行工艺,利用EDIR单一过程,同步获得了淡化出水的高截留率和浓缩产品水的高浓缩倍数。实验条件下,倒极周期为4h可获最佳分离效果。对于含Ni2+50mg.L-1、pH为3.0的NiSO4溶液,EDIR的淡水出水和浓水出水的Ni2+浓度可分别达到1.5mg.L-1和3961mg.L-1,淡水中Ni2+的脱除率为97%,浓水的浓缩倍数则为79.2,接近理论值。实验范围内,EDIR过程运行稳定,未产生Ni(OH)结垢。The electrodeionization process （EDI）with frequent polarity reversal,consisting of dilute and concentrate compartments both filled by ion-exchange resins,was developed to avert the difficult problem of deposit of metal hydroxide in treating heavy metal ions-containing solution.With feed of dilute NiSO4 solution,using operation processing：partial circulation of concentrate stream and successive switching of dilute and concentrate streams,both the high retention rate of desalination water and high concentrating ratio of concentrated product water were achieved just in a single process of EDIR.The best separation could be attained when the period of polarity reversal was 4 h.For NiSO4 solution feed containing 50 mg·L-1Ni2＋ and pH of 3.0,the Ni2＋ concentration in exit dilute and concentrate streams could reach 1.5 mg·L-1 and 3961 mg·L-1,and the efficiency of Ni2＋ removal was 97% and the concentrating ratio 79.2,respectively,approaching theoretical value.In the experimental range,the EDIR process could be operated with good stability and without Ni（OH）2 deposit.

关 键 词：电去离子 倒极 镍离子 重金属 

分 类 号：TQ028.8[化学工程]