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Method for Distinctive Estimation of Stored Acidity Forms in Acid Mine Wastes

机译:酸性矿山废物中酸度形式的有区别估计方法

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摘要

Jarosites and schwertmannite can be formed in the unsaturated oxidation zone of sulfide-containing mine waste rock and tailings together with ferrihydrite and goethite. They are also widely found in process wastes from electrometallurgical smelting and metal bioleaching and within drained coastal lowland soils (acid-sulfate soils). These secondary minerals can temporarily store acidity and metals or remove and immobilize contaminants through adsorption, coprecipitation, or structural incorporation, but release both acidity and toxic metals at pH above about 4. Therefore, they have significant relevance to environmental mineralogy through their role in controlling pollutant concentrations and dynamics in contaminated aqueous environments. Most importantly, they have widely different acid release rates at different pHs and strongly affect drainage water acidity dynamics. A procedure for estimation of the amounts of these different forms of nonsulfide stored acidity in mining wastes is required in order to predict acid release rates at any pH. A four-step extraction procedure to quantify jarosite and schwertmannite separately with various soluble sulfate salts has been developed and validated. Corrections to acid potentials and estimation of acid release rates can be reliably based on this method.
机译:含硫化物的矿山废石和尾矿的不饱和氧化带中,可以与亚铁酸盐和针铁矿一起形成雅罗斯石和schwertmannite。它们还广泛存在于电冶金冶炼和金属生物浸出过程中以及在排水的沿海低地土壤(酸性硫酸盐土壤)中的过程废物中。这些次生矿物质可以暂时存储酸性和金属,或者通过吸附,共沉淀或结构结合来去除和固定污染物,但在pH值大于约4时会释放酸性和有毒金属。因此,它们通过控制环境的作用与环境矿物学具有重要的联系。污染的水环境中的污染物浓度和动态。最重要的是,它们在不同的pH值下酸释放速率差异很大,并强烈影响排水的酸度动力学。为了预测在任何pH下的酸释放速率,需要一种用于估计采矿废物中这些不同形式的非硫化物储存的酸度的量​​的程序。已经开发并验证了一种四步萃取程序,用各种可溶性硫酸盐分别定量黄钾铁矾和schwertmannite。基于此方法,可以可靠地校正酸势并估计酸释放速率。

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  • 来源
    《Environmental Science & Technology》 |2014年第19期|11445-11452|共8页
  • 作者单位

    Minerals and Materials Science and Technology, Mawson Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia;

    Minerals and Materials Science and Technology, Mawson Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia;

    Minerals and Materials Science and Technology, Mawson Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia;

    Levay and Co. Environmental Services, University of South Australia, Mawson Lakes, South Australia 5095, Australia;

    Minerals and Materials Science and Technology, Mawson Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia;

    Minerals and Materials Science and Technology, Mawson Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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