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首页> 外文会议>Annual national meeting American Society for Surface Mining and Reclamation >GEOCHEMICAL FORECAST OF ACID MINE DRAINAGE TO EVALUATE CORRECTIVE ACTION PLANS FOR MINE RECLAMATION
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GEOCHEMICAL FORECAST OF ACID MINE DRAINAGE TO EVALUATE CORRECTIVE ACTION PLANS FOR MINE RECLAMATION

机译：酸性矿区排水的地球化学预测评价矿井垦区纠正措施计划

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A geochemical model was developed as part of the site investigation to characterize current geochemical conditions in coal refuse disposal areas and to support a modification to the reclamation plan at a closed underground coal mine in southern Illinois. The model provided significant insight into the geochemical processes which impact the development of a reclamation plan for the mine. Specifically, the geochemical model was designed to simulate the actual chemical reactions between infiltrating water and coal refuse and/or soil. The modeled acid mine drainage (AMD) was calibrated to observed conditions. Once these chemical reactions were understood, new geochemical models were developed to predict the effectiveness of proposed reclamation activities on ground-water quality. Development of the geochemical model proceeded in two steps: (i) construction of a detailed conceptual model which accounted for all reaction paths; and (ii) computer geochemical modeling to confirm the validity of each reaction path using MINTEQA2 and PHREEQE. Mineralogical analysis of the coal refuse confirmed that pyrite was the mineral responsible for the AMD, therefore the conceptual model focused on pyrite dissolution and the generation of sulfate. The computer modeling accurately predicted the resulting sulfate concentrations in the AMD observed for all reaction paths in the conceptual model. Once the system was adequately characterized by a geochemical model, new models were generated and validated via comparison to ground water analyses, followed by computer modeling to forecast the impact of a range of corrective action scenarios on the ground water. The forecast models were then used in conjunction with a ground-water flow model to evaluate the overall effectiveness of each component of the reclamation plan. The selected reclamation plan consists of hydraulic control of impacted ground water by pumping and construction of an enhanced cover system comprising a compacted clay liner overlain by a soil cover. This paper demonstrates how geochemical modeling is a valuable tool to use in evaluating and developing solutions for surface mine reclamation.
机译：作为现场调查的一部分开发了地球化学模型，以表征煤炭垃圾处理区域的当前地球化学条件，并支持伊利诺伊州南部闭路地下煤矿的复垦计划。该模型提供了对地球化学过程的重要见解，这些过程影响了矿井的开垦计划的发展。具体地，地球化学模型被设计为模拟渗透水和煤矸石和/或土壤之间的实际化学反应。模型酸性矿氨酸矿排水（AMD）被校准以观察到的条件。一旦理解这些化学反应，开发了新的地球化学模型，以预测拟议的填海活性对地下水质量的有效性。地球化学模型的发展分为两个步骤：（i）构建详细的概念模型，占所有反应路径; （ii）计算机地球化学建模，以确认使用Minteqa2和Phreeqe的每个反应路径的有效性。煤矸石的矿物学分析证实，黄铁矿是对AMD负责的矿物质，因此概念模型集中于黄铁矿溶解和硫酸盐的产生。计算机建模精确地预测了在概念模型中观察到所有反应路径的AMD中所得硫酸盐浓度。一旦该系统通过地球化学模型充分表征，通过与地面水分析的比较产生并验证了新模型，然后通过计算机建模预测了一系列纠正措施场景在地下水上的影响。然后将预测模型与地水流模型结合使用，以评估填海计划的每个部件的整体效果。所选择的填海计划包括通过泵送和构造具有由土壤覆盖物覆盖的压实粘土衬垫的增强覆盖系统的受冲击地水的液压控制。本文演示了地球化学建模是如何用于评估和开发表面矿地填充解决方案的有价值的工具。

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