云贵川交界地氟病区晚二叠世煤的酸度分布

为探讨云贵川交界处晚二叠世煤的酸度分布规律及其对地氟病的可能影响,在云南威信、镇雄,贵州赫章、大方、金沙及四川古蔺、叙永8个县区共采集龙潭组煤样83件,分别用p H计、重量法、高温燃烧-热水解法对其酸度、硫酸根及氟含量进行了测定,结果表明：研究区晚二叠世龙潭组煤的表观酸度p H值为1.86-8.62（均值5.70,n=83）,酸性煤（p H≤5.6）与正常煤（p H〉5.6）所占比例分别为41%,59%,且97.1%的酸性煤为露头煤;露头煤样的p H总分布范围为1.86-8.62,均值达到4.86（n=55）,其中33件酸性露头煤p H均值低至3.39（1.82-5.50,n=33）;矿井煤的...

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Published in煤炭学报 no. 4; pp. 964 - 973
Main Author 洪秀萍 梁汉东 张玉法 徐德明
Format Journal Article
LanguageChinese
Published 2016
Subjects
云贵川交界处
地氟病
氟化氢
煤
酸度
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Summary:为探讨云贵川交界处晚二叠世煤的酸度分布规律及其对地氟病的可能影响,在云南威信、镇雄,贵州赫章、大方、金沙及四川古蔺、叙永8个县区共采集龙潭组煤样83件,分别用p H计、重量法、高温燃烧-热水解法对其酸度、硫酸根及氟含量进行了测定,结果表明：研究区晚二叠世龙潭组煤的表观酸度p H值为1.86-8.62（均值5.70,n=83）,酸性煤（p H≤5.6）与正常煤（p H〉5.6）所占比例分别为41%,59%,且97.1%的酸性煤为露头煤;露头煤样的p H总分布范围为1.86-8.62,均值达到4.86（n=55）,其中33件酸性露头煤p H均值低至3.39（1.82-5.50,n=33）;矿井煤的p H为4.45-7.94,均值7.34（n=28）,指示露头煤的酸性显著强于矿井煤。实测煤样硫酸根含量为249-64 706μg/g（均值7 070μg/g,n=83）。煤中氟含量为44-382μg/g,均值120μg/g（n=83）,接近于中国煤中氟的背景值（130μg/g）。酸性煤的p H与其硫酸根含量的负对数p（SO4^2-）成正相关（相关系数：0.62）,表明煤中酸的存在形式可能为酸性硫酸盐如KHSO4或Na HSO4。推论是当这种酸性露头煤与当地高氟黏土混合使用,在燃烧或加热条件下,两者必将发生化学反应而释放出氟化氢（HF）。
Bibliography:coal; acidity; hydrogen fluoride; endemic fluorosis; the border area of Yunnan; Guizhou and Sichuan
To investigate the distribution pattern of acidity in the Late Permian coals in the boundary area of Yunnan,Guizhou and Sichuan and its possible impact on Endemic fluorosis,about 83 samples of coal were collected from the endemic fluorosis area of Weixin and Zhenxiong in Yunnan,Hezhang and Dafang in Guizhou,Gulin and Xuyong in Sichuan to determine the acidity,sulfate and fluorine content. The new discovery confirm that the p H of the Late Permian coals range from 1. 86 to 8. 62,with an average of 5. 70（ n = 83） and the proportions of acidic coal（ p H≤5. 6） and normal coal（ p H 5. 6） take account for 41% and 59% respectively,and 97. 1% of coal is outcrop coal. The p H of outcrop coals range from 1. 86 to 8. 62,with an average of 4. 86（ n = 55）,and the p H of acidic outcrop coal reaches3. 39（ 1. 82- 5. 50,n = 33）. The p H of coals in mine range from 4. 45 to 7. 94,with an average of 7. 36. The average p H of domes
ISSN:0253-9993