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Development of a kinetic geochemical model and its application in the prediction of acid mine drainage associated with mining.

机译：动力学地球化学模型的开发及其在与采矿相关的酸性矿山排水预测中的应用。

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A kinetic approach is developed to evaluate the potential for the formation of acid drainage from the oxidation of pyritic materials, both in situ and residual. This true kinetic approach incorporates the complex phenomena of pyrite oxidation, implemented within robust forward and inverse numerical models.; Pyrite oxidation is quantified and a simple yet applicable sub-model is developed based on current understanding of the mechanisms of pyrite oxidation. Plumer and Parkhurst's work (1979) is applied to define the production of alkalinity resulting from calcite dissolution. True kinetic parameters related to pyrite oxidation and calcite dissolution are obtained by introducing environmental factors, which may be determined by the inverse analytical method proposed in this study. Some of the primary concerns in developing true kinetic models, such as the formation of new phases in solutions and the selection of a stable computational time step, are addressed.; The model and approaches developed in this work are validated against (1) hypothetically constructed geochemical systems, (2) laboratory experimental data, and (3) field observational data. Processes are adequately reconstructed using the model. The effectiveness of alkaline material addition in preventing the formation of acid mine drainage following the closure of underground mines and the evolution of mine drainage quality are also represented through these tools. The evaluation of behavior at an abandoned underground coal mine confirms the reasonableness of the approach.
机译：已开发出一种动力学方法来评估从黄铁矿材料的氧化中原位和残留形成酸的可能性。这种真正的动力学方法结合了黄铁矿氧化的复杂现象，并在可靠的正向和反向数值模型中实现。基于当前对黄铁矿氧化机理的了解，对黄铁矿氧化进行了量化，并开发了一个简单而适用的子模型。 Plumer and Parkhurst（1979）的工作被用来定义方解石溶解所产生的碱度。通过引入环境因素可以获得与黄铁矿氧化和方解石溶解有关的真实动力学参数，可以通过本研究提出的反分析方法确定这些参数。解决了开发真实动力学模型的一些主要问题，例如溶液中新相的形成以及稳定计算时间步长的选择。在这项工作中开发的模型和方法已针对（1）假设构造的地球化学系统，（2）实验室实验数据和（3）现场观察数据进行了验证。使用该模型可以充分地重构过程。这些工具还显示了添加碱性物质在防止地下矿山关闭后防止酸性矿山排水形成的有效性以及矿山排水质量的演变。对废弃的地下煤矿的行为进行的评估证实了该方法的合理性。

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