Evaluation of selected static methods used to estimate element mobility, acid-generating and acid-neutralizing potentials associated with geologically diverse mining wastes
Evaluation of selected static methods used to estimate element mobility, acid-generating and acid-neutralizing potentials associated with geologically diverse mining wastes
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DOI：
10.1016/j.apgeochem.2014.12.007
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发表时间：
2015-06-01
影响因子：
3.4
通讯作者：
Lowers, Heather A.
中科院分区：
文献类型：
--
作者：
Hageman, Philip L.;Seal, Robert R.;Lowers, Heather A.
选择静态浸出和酸碱核算（阿坝）的方法，使用矿物学上不同的一套12个现代风格，金属矿山废物样品进行了比较研究，以了解各种测试的相对性能。为了补充这项研究，进行了深入的矿物学研究，以阐明样品矿物学，风化特征，渗滤液和阿坝特性之间的关系。在研究的第一部分中，使用六种常用的沥滤测试对样本进行了沥滤，包括糊状pH值、美国地质调查局（USGS）现场沥滤测试（FLT）（5分钟和18小时搅拌），美国环境保护署（USEPA）方法1312 SPLP（浸提液pH 4.2和浸提液pH 5.0）和USEPA方法1311 TCLP（浸提液pH 4.9）。对沥滤物的地球化学趋势进行了比较，以评估各种沥滤程序产生的差异（如果有的话）。结果表明，FLT（5分钟搅拌）是一样有效的，18小时的浸出试验在揭示渗滤液的地球化学特征的样品。浸出结果还表明，TCLP浸出试验产生的结果与其他浸出试验产生的结果不一致。在研究的第二部分中，阿坝是使用成熟的传统静态测试方法和相对快速，简化的净酸碱计算（NABA）程序对样品的分裂进行测定的。结果表明，传统的方法，虽然耗时，提供了最深入的数据的产酸，和酸中和的倾向的样品。然而，简化的NABA方法提供了一个相对快速，有效的估计净酸碱帐户的样品。总的来说，这项研究表明，虽然大多数成熟的方法是有用和有效的，但使用简化的浸出试验和NABA酸碱计算方法为调查人员提供了快速，定量的工具，可用于提供有关金属和其他成分的可溶解性的快速，可靠的信息。由Elsevier Ltd.发布。这是CC BY许可下的开放获取文章。
A comparison study of selected static leaching and acid-base accounting (ABA) methods using a mineralogically diverse set of 12 modern-style, metal mine waste samples was undertaken to understand the relative performance of the various tests. To complement this study, in-depth mineralogical studies were conducted in order to elucidate the relationships between sample mineralogy, weathering features, and leachate and ABA characteristics. In part one of the study, splits of the samples were leached using six commonly used leaching tests including paste pH, the U.S. Geological Survey (USGS) Field Leach Test (FLT) (both 5-min and 18-h agitation), the U.S. Environmental Protection Agency (USEPA) Method 1312 SPLP (both leachate pH 4.2 and leachate pH 5.0), and the USEPA Method 1311 TCLP (leachate pH 4.9). Leachate geochemical trends were compared in order to assess differences, if any, produced by the various leaching procedures. Results showed that the FLT (5-min agitation) was just as effective as the 18-h leaching tests in revealing the leachate geochemical characteristics of the samples. Leaching results also showed that the TCLP leaching test produces inconsistent results when compared to results produced from the other leaching tests. In part two of the study, the ABA was determined on splits of the samples using both well-established traditional static testing methods and a relatively quick, simplified net acid-base accounting (NABA) procedure. Results showed that the traditional methods, while time consuming, provide the most in-depth data on both the acid generating, and acid neutralizing tendencies of the samples. However, the simplified NABA method provided a relatively fast, effective estimation of the net acid-base account of the samples. Overall, this study showed that while most of the well-established methods are useful and effective, the use of a simplified leaching test and the NABA acid-base accounting method provide investigators fast, quantitative tools that can be used to provide rapid, reliable information about the leachability of metals and other constituents of concern, and the acid-generating potential of metal mining waste. Published by Elsevier Ltd. This is an open access article under the CC BY license.