Aims/hypothesis

Pohang Tertiary mudstone presents the issue of acid rock drainage. This study analyzed the capacity of a mixed slag (70% steel slag + 30% blast furnace slag) to neutralize Pohang Tertiary mudstone’s acid rock drainage.

Methods

Element analysis, acid neutralization capacity (ANC) test, and net acid generation (NAG) test were conducted on Pohang Tertiary mudstone samples and the mixed slag. The XRF analysis and the XRD analysis on the mixed slag were conducted to measure the CaO content, which indicates the potential of the mixed slag as an acid-neutralizing agent.

Results

According to the analysis results on the Pohang Tertiary mudstone samples, the total sulfur content was high, which indicates a high risk of acid rock drainage generation. Although there were slight deviations between the samples, overall, the mudstone exhibited a high acid rock drainage generation capacity. The XRF analysis of mixed slag results showed high amounts of CaO content. From the XRD analysis graph, it was clear that a high proportion of minerals with Ca- compounds consisting of basic substances were present. The neutralization capacity of the mixed slag on Pohang Tertiary mudstone was determined by the relationship between maximum potential acidity (MPA) and acid neutralization capacity (ANC). For instance, the mixed slag of 4.5% effectively neutralizes a sulfur content of 1%.

中文翻译：

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矿渣对酸性岩排水的中和作用

目的/假设

浦项第三纪泥岩提出了酸性岩石排泄的问题。这项研究分析了混合渣（70％的钢渣+ 30％的高炉渣）的能力，以中和浦项第三纪泥岩的酸性岩石排泄物。

方法

对浦项第三纪泥岩样品和混合渣进行了元素分析，酸中和能力（ANC）测试和净酸生成（NAG）测试。对混合渣进行了XRF分析和XRD分析，以测量CaO含量，这表明了混合渣作为酸中和剂的潜力。

结果

根据浦项第三纪泥岩样品的分析结果，总硫含量很高，这表明产生酸性岩石排水的风险很高。尽管样品之间存在细微的偏差，但总体而言，泥岩显示出高的酸性岩石排水产生能力。混合渣的XRF分析表明，CaO含量很高。从XRD分析图中可以明显看出，存在着高比例的由碱性物质组成的钙化合物矿物。浦项第三纪泥岩上混合渣的中和能力由最大潜在酸度（MPA）与酸中和能力（ANC）之间的关系确定。例如，4.5％的混合渣有效中和了1％的硫含量。