利用污泥脱除燃煤电厂烟气中的汞

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（Hg0）有吸附氧化作用，吸附能力为175.6 μg·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Hg0的催化氧化反应。

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

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 aggregation-based 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.