Experimental study on secondary mineralogy and permeability during treatment acid mine drainage using calcite
Abstract：The secondary mineralogy and permeability variation were studied by batch and long-term column experiments during treatment of acid mine drainage using calcite, the characteristic peaks of infrared spectra and images of scanning electron microscope reveal that the calcite surface has two coating layers, the internal layer is crystalline gypsum, the external layer is lepidocrocite, which can gradually change into goethite. The model of releasing calcium ion on coating surface of calcite was established by Fick＇ s first law ,p （ Ca^2＋） = At^1/2 ＋B, the result shows that a value is inversely proportional to square of proportion of gypsum in coating layer （fgyp）. The result of column experiment shows that the permeability variation is catastrophe process, the coating layer of iron is a key factor of clogging during longterm treatment.
Keywords：acid mine drainagesecondary mineralogyhydraulic conductivityclogging
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1010-1014 )