燃烧温度对两淮烟煤中汞含量与赋存形态的影响
Influence of Combustion Temperature on Mercury Content and Occurrence Form of Bituminous Coal in Huainan and Huaibei Regions
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摘要: 为了调查两淮烟煤中汞元素在不同燃烧温度下的地球化学行为，在两淮地区4个典型煤矿床分别采集了4个烟煤样品。采用程序升温石英管式炉获得400、500、600、700、800 ℃和900 ℃下的煤灰样品。利用ICP-MS测定了原煤及煤灰样品中Hg元素的含量，结合X射线衍射（XRD）和傅里叶转换红外光谱（FTIR）分析，取得如下成果：烟煤中Hg的丰度值约为0.1 μg/g；烟煤中Hg主要以残渣态形式为主，其次为可交换态和碳酸盐结合态；烟煤中Hg主要挥发温度位于400～500 ℃间，仅有少量的Hg会赋存在灰渣之中； XRD实验表明，烟煤中黏土矿物含量变化与汞的变化关系密切；此外，残渣中固定碳的存在影响着其Hg含量变化； FTIR实验表明，烟煤中Hg含量与C=O官能团含量呈较好的正相关关系，表明煤中C=O含量可以用作检测煤中Hg含量的指示剂。Abstract: In order to investigate the geochemical behavior of mercury in two bituminous coal at different combustion temperature, 4 samples of bituminous coal were collected from 4 typical coal mines in Huainan and Huaibei regions. The samples of coal ash at 400 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃ and 900 ℃ were obtained by a quartz tube furnace. The content of Hg element in coal and coal ash samples were determined using ICP-MS, combined with X ray diffraction （ＸＲD） and Fourier transform infrared spectroscopy （ＦＴＩＲ） analysis. The results obtained are as follows: the abundance of Hg in bituminous coal is about 0.1 μg/g; Hg in bituminous coal is mainly in the form of residue, followed by exchangeable and carbonate binding states; volatile temperature of Hg in bituminous coal is at 400 ℃ to 500 ℃, a small amount of Hg is deposited in the slag; XRD experiments show that the variation of clay mineral content in bituminous coal is closely related to the variation of mercury; the presence of fixed carbon in the residue affects its Hg content; FTIR experiment shows that Hg content in bituminous coal has a good positive correlation with C=O functional group content, it indicates that the content of C=O in coal can be used as an indicator to detect the Hg content in coal.
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Keywords:
- mercury /
- bituminous coal /
- combustion temperature /
- geochemistry /
- occurrence form /
- clean coal
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