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<p>In this work, studies have been carried out to determine the acid-generating potential of the dump site of a coal enterprise operating in Çanakkale/Türkiye province. For this purpose, both static (ABA) and kinetic tests (humidity cell) were applied. Samples were taken from 80 separate locations to represent all characteristics of the dump site. It was determined that the average sulphur content of the dump site was 0.95%, the average acid-generating potential (AGP) was 37.86&#xa0;kg CaCO<sub>3</sub>/t, the average neutralisation potential (NP) was 85.48&#xa0;kg CaCO<sub>3</sub>/t, and the average NP/AGP was &lt; 3. According to related regulations, these results showed that the prediction of whether the dump site will produce AMD must be done after being supported by kinetic tests. For this reason, the samples taken from the dump site were divided into four different zones based on the sulphur content. At the same time, the sulphur distribution of the dump site was mapped with the help of the ArcGIS 10.4 programme. Aforementioned samples were subjected to kinetic tests in the humidity cell for 24&#xa0;weeks at two different particle sizes, namely − 6.25&#xa0;mm and − 0.150&#xa0;mm, and their long-term AMD generation potential was investigated. To this purpose, the pH and the electrical conductivity values of the drained water were measured at first. In addition, quantities of dissolved Ca, Mg, Cl, SO<sub>4</sub>, Fe, and NO<sub>3</sub> were analyzed in accordance with the standards to monitor the quality and environmental effects of the drained water. According to the results of humidity cell tests, the pH of the drained water was above the limit value of pH 4 for a period of 24&#xa0;weeks. When the dissolved ion values, particularly those from the humidity cell tests carried out at a particle size of − 6.25&#xa0;mm, were examined, it was found that particularly the activity of ionic release was higher than ionic release at a particle size of − 0.150&#xa0;mm. Additionally, the ion chromatography analyses showed that Zone I and Zone IV had higher ion release than other zones. Consequently, although the static and kinetic test results show that no drainage with acidic characteristics will be generated on the dump site; it is found that the presence of sulphate detected in the drained water, especially of those gypsum and pyrite mineral origins, should be taken into consideration.</p>

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Investigation of Acid Mine Drainage Generation Potential of Altered Volcanic Units

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Uğur Demir,
  • Ömer Canıeren,
  • Cengiz Karagüzel

摘要

In this work, studies have been carried out to determine the acid-generating potential of the dump site of a coal enterprise operating in Çanakkale/Türkiye province. For this purpose, both static (ABA) and kinetic tests (humidity cell) were applied. Samples were taken from 80 separate locations to represent all characteristics of the dump site. It was determined that the average sulphur content of the dump site was 0.95%, the average acid-generating potential (AGP) was 37.86 kg CaCO3/t, the average neutralisation potential (NP) was 85.48 kg CaCO3/t, and the average NP/AGP was < 3. According to related regulations, these results showed that the prediction of whether the dump site will produce AMD must be done after being supported by kinetic tests. For this reason, the samples taken from the dump site were divided into four different zones based on the sulphur content. At the same time, the sulphur distribution of the dump site was mapped with the help of the ArcGIS 10.4 programme. Aforementioned samples were subjected to kinetic tests in the humidity cell for 24 weeks at two different particle sizes, namely − 6.25 mm and − 0.150 mm, and their long-term AMD generation potential was investigated. To this purpose, the pH and the electrical conductivity values of the drained water were measured at first. In addition, quantities of dissolved Ca, Mg, Cl, SO4, Fe, and NO3 were analyzed in accordance with the standards to monitor the quality and environmental effects of the drained water. According to the results of humidity cell tests, the pH of the drained water was above the limit value of pH 4 for a period of 24 weeks. When the dissolved ion values, particularly those from the humidity cell tests carried out at a particle size of − 6.25 mm, were examined, it was found that particularly the activity of ionic release was higher than ionic release at a particle size of − 0.150 mm. Additionally, the ion chromatography analyses showed that Zone I and Zone IV had higher ion release than other zones. Consequently, although the static and kinetic test results show that no drainage with acidic characteristics will be generated on the dump site; it is found that the presence of sulphate detected in the drained water, especially of those gypsum and pyrite mineral origins, should be taken into consideration.