Geochemistry of ochreous precipitates from coal mine drainage in India |
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Authors: | Sk Md Equeenuddin S Tripathy P K Sahoo M K Panigrahi |
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Institution: | (1) Department of Mining Engineering, National Institute of Technology, Rourkela, Orissa, 769008, India;(2) Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, 721302, India |
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Abstract: | The deposition of ochreous is common by a consequence of acid mine drainage (AMD). The ochreous precipitated from the AMD
sites around Tertiary coalfield of Assam, India were collected and characterized by X-ray diffractometry (XRD), Fe to S molar
ratio, ammonium oxalate acid (pH 3.0) extraction, fourier-transform infrared spectroscopy (FTIR), field emission scanning
electron microscopy (FESEM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The ochreous mainly
consists of goethite, schwertmannite, ferrihydrite and jarosite. Mineralogy of ochreous was controlled by the pH whereas formation
of ferrihydrite was favored at high organic carbon content. Role of bacteria for the formation of secondary minerals was observed.
Mobility of metals was controlled by the ochreous, and they were also retained during the process of phase transformation
of poorly ordered iron-oxyhydroxysulfates into the stable forms. |
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