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Multiphase flow and reactive transport model in vadose tailings

机译:渗流尾矿中的多相流和反应输运模型

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摘要

Weathering processes affecting pyritic wastes may generate huge amounts of acid waters with high concentrations of potentially toxic contaminants (acid mine drainage). Acid mine drainage is mainly produced in the vadose zone. In the present study, a coupled non-isothermal multiphase flow and reactive transport model of the vadose zone of sulfide mine tailings was developed. The geochemical model included kinetically controlled reactions for Fe(II)-oxidation and for the dissolution of sulfide and aluminosilicate phases and the Pitzer ion-interaction model to describe the behavior of the pore-water solutions. Model results were compared with experimental observations in unsaturated column experiments under strongly evaporative conditions similar to and or semiarid climates. Evolution trends for temperature. water saturation, evaporation rates, pore-water hydrochemistry and mineral phases observed during the drying experiment were adequately reproduced. The coupled model reproduced the increase of solute concentrations in the column top and the precipitation of a crust of secondary mineral phases. This crust became a barrier for water vapour diffusion to the atmosphere and modified the thermohydraulic behavior of the tailings. Enhanced downward migration of water vapour and its condensation in this colder end of the column were correctly taken into account by the model, which reproduced the dilution observed in the lower part of the column during the experiments.
机译:影响黄铁矿废物的风化过程可能会产生大量带有高浓度潜在毒性污染物的酸性水(酸性矿山排水)。酸性矿山排水主要发生在渗流带。在本研究中,建立了硫化矿尾矿渗流区的非等温多相流和反应输运耦合模型。地球化学模型包括动力学控制的Fe(II)氧化反应以及硫化物和铝硅酸盐相的溶解反应,以及Pitzer离子相互作用模型来描述孔隙水溶液的行为。将模型结果与在类似于和/或半干旱气候的强蒸发条件下的非饱和柱实验中的实验观察结果进行比较。温度的变化趋势。充分再现了干燥实验中观察到的水饱和度,蒸发速率,孔隙水水化学和矿物相。耦合模型再现了塔顶溶质浓度的增加和次生矿物相地壳的沉淀。该结皮成为水蒸气向大气扩散的障碍,并改变了尾矿的热工水力行为。模型正确地考虑了水蒸气在塔的较冷端向下迁移的增强及其冷凝,该模型重现了在实验期间在塔下部观察到的稀释度。

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