云贵川交界区晚二叠世煤系地层出露风化土的酸性特征

发布时间：2018-02-24 00:42

  本文关键词： 风化土 酸度 氟化氢 地氟病 云贵川交界区　出处：《环境化学》2017年08期 　论文类型：期刊论文

【摘要】：云贵川交界区农村流行地氟病且曾以"土"拌煤作为生活燃料的现象普遍,煤系地层广泛出露且前人观察指出当地拌煤"土"常取自煤系地层风化土.本文以采自该区7个县域的71件煤系地层出露风化土为样本进行研究,结果表明,52%的风化土呈酸性,pH均值为4.62(2.39—5.54,n=37);硫酸根含量显著偏高,均值达到1778μg·g~(-1)(295—13086μg·g~(-1),n=71);氟含量总体偏高,均值达到751μg·g~(-1)(237—1764μg·g~(-1),n=71).酸性风化土的pH与其硫酸根含量的负对数-lg C[SO2-4]成正相关(r=0.75),表明风化土中酸的存在形式可能为酸性硫酸盐如KHSO4或Na HSO4,而后者可能源自煤系地层中黄铁矿的风化.在一定条件下(燃烧),风化土内部的酸与氟在燃烧条件下的相互作用可能导致氟化氢释放,且风化土中氟与高硫煤在燃烧条件下相互作用可能加剧氟化氢释放.
[Abstract]:Endemic endemic endemic fluorosis in the rural areas of Yunguichuan border area and the phenomenon of "soil" mixing coal as a fuel for daily life is common. The coal measure strata are widely exposed and the former observation points out that the local mixed coal "soil" is often taken from weathering soil of coal measure strata. In this paper, 71 samples of exposed weathered soil from 7 counties in this area are taken as samples. The results showed that the mean value of pH was 4.62U 2.39-5.54N ~ (37), the content of sulphate was significantly higher, the mean value was 1778 渭 g 路g 路g ~ (-1) ~ (-1) ~ 295-13086 渭 g 路g ~ (-1) ~ (-1), the total fluorine content was on the high side, The mean value of the acid weathered soil is 771 渭 g 路g / g ~ (-1) ~ 237-1764 渭 g 路g ~ (-1). The pH value of acidic weathered soil is positively correlated with the negative logarithmic -lg C [SO2-4] of sulphate content, indicating that the acid in weathered soil may be in the form of acid sulfate such as KHSO4 or Na _ HSO _ 4, which may be derived from pyrite in coal-bearing strata. Under certain conditions (the interaction of acids in weathered soils with fluorine under combustion conditions may lead to the release of hydrogen fluoride, Furthermore, the interaction between fluorine and high sulfur coal in weathered soil may increase the release of hydrogen fluoride.
【作者单位】： 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;中国矿业大学(北京)地球科学与测绘工程学院;四川省煤田地质工程勘察设计研究院;
【基金】：国家自然科学基金(41371449)资助~~
【分类号】：R188
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