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将黔西南煤层中不同成因的7种主要矿物分离,对其进行光学显微镜、扫描电镜及能谱分析;利用冷原子吸收光谱测定煤及矿物中汞的含量;并结合矿物包裹体测温和硫同位素分析,研究结果表明,黔西南煤层中汞主要分布于矿物中。不同成因黄铁矿中汞含量明显不同,后期低温热液成因的黄铁矿中汞含量(22.5×10~(-6))>>结核状黄铁矿中的(3.51×10~(-6))>块状黄铁矿中的(2.97×10~(-6))>后期淋滤成因黄铁矿中的(1.80×10~(-6))。煤中后期低温热液成因的黄铁矿脉中汞(22.5×10~(-6))和方解石脉中汞(11.9×10~(-6))含量高,煤层所含方解石中含汞量较高以前未见报道。黔西南煤层中,原生成因的汞含量很低,后期淋滤成因的汞含量占较大比例,特别是后期低温热液成因的汞是部分煤中汞最主要来源,通过洗选可大大降低煤燃烧过程中汞的排放量。
The seven major minerals of different origin in southwestern Guizhou Province were separated and analyzed by optical microscope, scanning electron microscope and energy spectrum. The content of mercury in coal and mineral was determined by cold atomic absorption spectrometry. Combined with the temperature measurement and sulfur isotope analysis of mineral inclusions The results show that the mercury in the southwestern Guizhou Province is mainly distributed in the minerals. The content of mercury in pyrite with different causes is obviously different, and the content of mercury in pyrite which is caused by low temperature hydrothermal in later stage (22.5 × 10 -6) >> (3.51 × 10 -6 ) (2.97 × 10 -6) in the massive pyrite and (1.80 × 10 -6) in the leaching pyrite in the late stage. Mercury (22.5 × 10 -6) in the pyrite vein and 11.9 × 10 -6 (Hg) in the calcite veins due to the pyrohydrothermal genesis in the late stage of coal are high, and the mercury content in the calcite contained in the coal seam Higher than previously reported. In Qianxinan coal seam, the mercury content of primary genesis is very low and the mercury content of leaching causes a large proportion in later stage. Especially, mercury, the genesis of late low temperature hydrothermal fluid, is the most important source of mercury in some coal, which can greatly reduce coal Mercury emissions during combustion.