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- W54902171 abstract "Natural attenuation processes in sulfide-bearing mine tailings may involve the formation of hardpans or cemented layers, which are characterized by increased concentrations of secondary phases. As these secondary phases often consist of amorphous or partially crystalline phases, a substantial temporary natural attenuation of toxic compounds as well as a reduction in porosity and permeability may occur. Hardpans / cemented layers have predominantly been found in regions of increased stratification (Graupner et al., 2007). The reactive transport model FLOTRAN (Lichtner, 2007) was applied to study the potential of sulfidebearing mine tailings to form cemented layers in the presence and absence of biotite-rich silt/clay layers. Kinetically controlled reaction parameters were calibrated in column experiments and initial concentrations of primary phases were estimated from field data. In the case of a homogeneous distribution of primary phases, the simulated secondary phases were found to precipitate uniformly over the entire profile. However, in the presence of biotite-rich silt/clay layers, an accumulation of secondary phases was predicted in biotite-rich layers. The simulated major secondary phases (jarosite, Fe gel, Si gel, and gypsum) are in accordance with the phases identified in field samples. The simulated cemented layers act as local water tables which largely prevent the downward migration of oxygen. The simulation results can be explained by a combination of the following processes: (a) generation of acid mine drainage due to the oxidation of sulfides, (b) downward transport of Fe 2+ , SO4 2- , and H + , (c)" @default.
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- W54902171 date "2007-01-01" @default.
- W54902171 modified "2023-09-28" @default.
- W54902171 title "Reactive transport modeling of natural attenuation processes in sulfide-bearing mine tailings" @default.
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