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Comparison Of Fly Ash Leaching Methods

机译：粉煤灰浸出方法的比较

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摘要

Five leaching methods (serial batch leaching procedure (SBLP), synthetic groundwater leaching procedure (SGLP), mine water leaching procedure (MWLP), 3 TIER integrated framework leaching protocol (3TIER), and toxicity characteristic leaching procedure (TCLP)) were compared using two samples, a class F fly and a class C fly ash. Each method was tested in triplicate, according to the published procedure, and leachate was analyzed for 23 elements. The procedures were compared on the basis of elemental availability, defined as the cumulative elemental release per kg of sample, and the variation in extraction with increased L/S as a surrogate for long term release. Higher availability values were obtained with the SBLP and MWLP, which cover a range of pH's and 3TIER, which uses EDTA to form soluble complexes. SGLP, a high pH procedure, and TCLP, mildly acidic, generally produced lower availability values. Cumulative elemental extraction as a function of L/S in SBLP, MWLP and 3TIER generally agreed within an order of magnitude.
机译：比较了五种浸出方法（串行分批浸出程序（SBLP），合成地下水浸出程序（SGLP），矿井水浸出程序（MWLP），3种TIER综合框架浸出程序（3TIER）和毒性特征浸出程序（TCLP））。两个样品，一个F级粉煤灰和一个C级粉煤灰。每种方法均按照公布的程序进行三次重复测试，并对渗滤液中的23种元素进行分析。根据元素的可用性对程序进行比较，元素的可用性定义为每千克样品的累积元素释放，并且随着L / S的增加，提取的变化可作为长期释放的替代物。 SBLP和MWLP涵盖了一系列pH值和3TIER（使用EDTA形成可溶性复合物），可获得更高的可用性值。通常，高pH值的SGLP和弱酸性的TCLP产生的可用性值较低。 SBLP，MWLP和3TIER中累积元素提取作为L / S的函数通常在一个数量级内一致。

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