利用污泥脱除燃煤电厂烟气中的汞  

Using abandoned mine drainage precipitate for mercury emission control for coal-fired power plant

作　　者：鹿存房 刘清才[2] 全学军[1] LU Cunfang LIU Qingcai QUAN Xuejun(School of Chemistry and Chemical Engineering, Chongqing University of Technology Chongqing, 400050, China College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)

机构地区：[1]重庆理工大学化学化工学院,重庆400050 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《环境工程学报》2017年第10期5559-5564,共6页Chinese Journal of Environmental Engineering

基　　金：国家科技支撑计划(2007BAC24B03);重庆理工大学科研启动项目(0115170343)

摘　　要：以废弃煤矿废水治理产生的污泥(AMD污泥)为原料,制备了烟气脱汞吸附剂,在模拟烟气-固定床平台对其吸附性能进行了研究。结果表明,AMD污泥对烟气中的单质汞(Hg^0)有吸附氧化作用,吸附能力为175.6μg·g^(-1),氧化率为60%~75%左右。为了进一步探索AMD污泥与烟气中汞的反应机理,将实验室合成的针铁矿作为对比试样进行研究。结果表明,AMD污泥具有结构疏松、比表面积大、晶粒尺寸为纳米级别的特点,具有很好的吸附基础;污泥表面形成的晶体缺陷有利于Hg^0的催化氧化反应。Properties of Fe-rich abandoned mine drainage （AMD） precipitates on mercury removal were accomplished by fixed bed adsorption system.Pure goethite was synthesized as a reference material.Characteristic examination tests revealed the AMD precipitates primarily consist of poorly crystallized nanoparticulate goethite.Fixed bed adsorption tests demonstrate the AMD sludge sample own mercury removal capacity of about 175.6 μg·g^-1.Furthermore,a predominant oxidized mercury fraction of about 65% to 70% was also observed.Properties responsible for oxidation reaction mechanism were analyzed preliminarily.Previously proposed aggregationbased growth pathway was helpful to understand the crystal formation process,during which point defects,dislocations and planar defects on the surface were produced.In this study,they were considered as active sites for the elemental mercury oxidation reactions.

关 键 词：AMD污泥 汞 烟气 针铁矿 

分 类 号：X511[环境科学与工程—环境工程]