利用异相膜电渗析装置去除氨法烟气脱硫浆液中的F-.考察了脱硫浆液pH、F-初始质量浓度、Cl-初始质量浓度、膜堆两端电压、浓缩室和淡化室循环流量等操作参数对F-去除效果的影响.实验结果表明:在酸性条件下,F-去除率更高;脱硫浆液中F-初始质量浓度越高,F-去除率越高;Cl-初始质量浓度较低时会增加F-去除率,过高时又会降低F-去除率.优化的操作条件为:膜堆两端电压25 V,浓缩室和淡化室循环流量300 L/h.一级电渗析进行100 min 后,Cl-去除率接近100%,F-去除率只有47.3%.二级电渗析进行100 min时,F-去除率达92.2%.一、二级电渗析F-累积去除率达96.1%.%F- was removed from the slurry in ammonia flue gas desulfurization using a heterogeneous membrane electrodialysis device. The operating parameters affecting F- removal were studied,such as:slurry pH,initial mass concentration of F- and Cl-,applied voltage,circulation flow of concentrating chamber and desalination chamber,and so on. The experimental results showed that:Acidic condition was conducive to F- removal;The F- removal rate was increased with the increasing of initial F- mass concentration and lower mass concentration of Cl-,but decreased when the initial Cl- mass concentration was too high. The optimum operation conditions were as follows:applied voltage 25 V,circulation flow 300 L/h. The removal rate of Cl- and F- was 100% and 47.3% after the first-stage electrodialysis for 100 min,and after the second-stage electrodialysis for 100 min,the removal rate of F- reached 92.2%. The total F-removal rate was 96.1% by the two-stages electrodialysis.
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