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首页> 外文期刊>Energy Exploration & Exploitation >Geochemical characteristics of fluorine in coal within Xiangning mining area, China, and associated mitigation countermeasures
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Geochemical characteristics of fluorine in coal within Xiangning mining area, China, and associated mitigation countermeasures

机译：中国襄宁矿区煤中氟的地球化学特征及缓解对策

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摘要

The geochemical characteristics of fluorine in coal obtained from 534 borehole exploration data and mining test data from the Xiangning mining area were studied, and fluorine emissions were calculated. Results reveal that the fluorine content in Carboniferous-Permian coal in the mining area ranges from 2.00 to 911.00 mg/kg, and the Carboniferous coal seam contents are generally higher than those of the Permian system. The calculated average fluorine contents in Nos. 5 and 12 coal seams of the Carboniferous system are 203.42 and 308.00 mg/kg, respectively, and therefore, both are high-fluorine coal. In addition, the calculated mean fluorine contents of Nos. 2 and 10 coal seams are 168.58 and 187.02 mg/kg, respectively, which are higher than average value of Chinese and global coal values. The highest fluorine content of 896.00 mg/kg is found in medium- to high-fluorine coal. Fluorine in coal mainly exists in an inorganic bound state in forms such as fluorapatite and calcium fluoride. The Xiangning Coal Mine predominantly produces coal for coking and power, and the release of fluorine during coal combustion is harmful to the environment. According to the information obtained in relation to coal resource reserves and development planning, the amount of fluorine released from combustion is estimated at 2258.1 t/year and is estimated to reach 4862.9 t/year by 2020. Coal washing is an effective way of reducing fluorine emissions, and flotation experiments have shown that this can reduce the amount of fluorine by up to 30-47%. Different engineering measures, such as denitrification and desulfurization, can also significantly reduce the amount of fluorine released during coal combustion and can thus be employed to reduce the associated environmental impacts.
机译：研究了从湘宁矿区的534个井眼勘探数据和采矿试验数据获得的煤中氟的地球化学特征，并计算了氟的排放量。结果表明，该矿区石炭—二叠纪煤中氟含量为2.00〜911.00 mg / kg，石炭系煤层含量普遍高于二叠系。石炭系5号和12号煤层的平均氟含量分别为203.42和308.00 mg / kg，因此均为高氟煤。此外，计算得出的2号和10号煤层的平均氟含量分别为168.58和187.02 mg / kg，高于中国和全球煤炭均价的平均值。中至高氟煤中的最高氟含量为896.00 mg / kg。煤中的氟主要以无机结合态的形式存在，如氟磷灰石和氟化钙。香宁煤矿主要生产用于焦化和发电的煤炭，而煤炭燃烧过程中释放的氟对环境有害。根据与煤炭资源储备和发展规划有关的信息，燃烧释放的氟量估计为2258.1吨/年，到2020年估计将达到4862.9吨/年。洗煤是减少氟的有效途径排放和浮选实验表明，这可以减少多达30-47％的氟含量。不同的工程措施，例如反硝化和脱硫，也可以显着减少燃煤过程中释放的氟量，因此可以用来减少相关的环境影响。

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