烟气脱硫液中Hg^(2+)还原及稳定化初探  

Primary research of Hg^(2+) reduction and stabilization in wet flue gas desulfurization liquors.

作　　者：成潇雅[1] 汤婷媚[1] 张萌[1] 钟晓航[1] 沃静静[1] 徐新华[1] 

机构地区：[1]浙江大学环境工程系,浙江杭州310027

出　　处：《浙江大学学报（理学版）》2010年第5期568-571,共4页Journal of Zhejiang University（Science Edition）

基　　金：国家863课题(2007AA06Z340);国家自然科学基金资助项目(200877066)

摘　　要：针对烟气脱硫液中Hg2+易被还原并再释放进入大气,造成二次污染的特点,研究脱硫液中汞离子的还原释放机制以及稳定化的方法.对于前者,考察了pH、SO32-、Ca2+和Mg2+等因素对Hg2+还原速率的影响;对于后者,主要采用螯合沉淀法,通过实验对比了TMT和DTCR两种金属离子捕捉剂的性能.通过本研究,可以有效解决Hg2+在脱硫液中的还原释放及二次污染问题,并为湿法脱硫同时脱汞的工业应用提供理论依据.In this study,considering that Hg2＋ in wet flue gas desulfurization（FGD） systems can easily be reduced and then released into atmosphere,causing secondary pollution,Hg2＋ reduction mechanism and restraining method are carried out.The influences of several experimental parameters have been investigated,including pH,concentrations of Cl-and S（IV）,etc.In addition,stabilization of Hg2＋ was studied by using TMT and DTCR.The results showed that re-emissions apparently decreased as precipitation of TMT-Hg and DTCR-Hg solid lowers Hg2＋ concentration in solution.All of the above can provide theoretical basis for industrial application of mercury control in wet FGD systems.

关 键 词：脱硫液 Hg2+ 还原释放 稳定化 TMT DTCR 

分 类 号：X52[环境科学与工程—环境工程]