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Analysis of corrosive characteristics of acid mine drainage on infrastructure materials

机译：基础设施材料酸性矿山排水的腐蚀特性分析

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摘要

The chemical signature of the AMD samples analysed revealed high toxicity, and may be classified as highly acidic, with a pH range of 2.6 to 3.2. The relatively low concentration of calcium, sodium and potassium alkalis inherent in the open pit AMD may render it to be more aggressive and attacking than AMD from underground decant. The Langelier Saturation Index of the AMD was estimated to be in the range of -7.0 while the aggressiveness index was about 30 times greater than corresponding values expected of non-corrosive normal water quality. According to both indices, the AMD may be classified as being very highly corrosive. It can be expected that the AMD examined has high potential to cause corrosive attack on aquatic and plant life, soils, infrastructure, equipment, and construction materials, especially steel and concrete. Lime treatment of AMD showed an increase in Ca and removal of Mg, Mn and Fe, but the other physico-chemical parameters in the water generally remained unchanged. Interestingly, the lime-treated AMD still falls into a highly corrosive category of aggressive water, although the indices for the treated water were two to three times less than those for raw AMD. These results indicate the inadequacy of lime treatment as an end in itself to improving AMD water quality prior to discharge to the environment. The qualitative analyses conducted are also confirmed by field observations exhibiting steel corrosion and concrete disintegration due to AMD attack, as discussed above.
机译：被分析的AMD样品的化学特征显示出高毒性，可以归为高酸性，pH范围为2.6至3.2。露天AMD中固有的钙，钠和钾碱浓度相对较低，可能使其比地下倾析物中的AMD具有更强的攻击性。 AMD的Langelier饱和指数估计在-7.0范围内，而侵略性指数则是非腐蚀性正常水质预期值的30倍左右。根据这两个指数，AMD可能被归类为腐蚀性极强的产品。可以预期，所检查的AMD具有很高的潜力，可对水生植物，土壤，基础设施，设备和建筑材料（尤其是钢和混凝土）造成腐蚀。石灰对AMD的处理显示出Ca的增加和Mg，Mn和Fe的去除，但是水中的其他理化参数通常保持不变。有趣的是，尽管经过处理的水的指标比未经处理的AMD的指标低两到三倍，但经石灰处理的AMD仍属于腐蚀性强的腐蚀性水。这些结果表明石灰处理本身不足以改善排放到环境中之前的AMD水质。如上所述，进行定性分析的结果还得到了现场观察的证实，这些观察结果显示由于AMD腐蚀而导致钢腐蚀和混凝土崩解。

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  • 来源
    《Civil Engineering》 |2014年第7期|11-15|共5页
  • 作者

    Stephen Ekoiu; Souleymane Diop; Firehiwot Azene;

  • 作者单位

    Department of Civil Engineering Science University of Johannesburg;

    Council for Geoscience Pretoria;

    Council for Geoscience Pretoria;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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