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Ennoyage des mines de fer lorraines : impact sur la qualité de l'eau

Abstract : The flooding of the abandoned ironmines of Lorraine leads to a degradation of the groundwater quality. Laboratory experiments allowed us to build a kinetic chemical model based on simple chemical mechanisms. During mining operations, pyrite oxidation and carbonate dissolution lead to the precipitation of gypsum. The local decrease of pH favours local dissolutions of minerals and releases ions that are fixed on cationic exchange sites. During the flooding of the mine workings, the dissolution of the newly precipitated gypsum, the precipitation of carbonates and cationic exchange reactions are responsible for the increase of the concentrations of sulphate, magnesium, sodium, potassium and strontium in water. Thereafter, these concentrations would decrease with the natural leaching of the mining reservoir.
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Pauline P. Collon, Robert Fabriol, Michel Buès. Ennoyage des mines de fer lorraines : impact sur la qualité de l'eau. Comptes Rendus Géoscience, Elsevier, 2004, 336 (10), pp.889-899. ⟨10.1016/j.crte.2004.02.010⟩. ⟨hal-01342851⟩



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