Geochemistry of ochreous precipitates from coal mine drainage in India

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, fo...

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Bibliographic Details
Published in:Environmental earth sciences 2010-08, Vol.61 (4), p.723-731
Main Authors: Equeenuddin, Sk. Md, Tripathy, S., Sahoo, P. K., Panigrahi, M. K.
Format: Article
Language:English
Subjects:
Acid mine drainage
Ammonium
Biogeosciences
Coal mines
Coal mining
Drainage
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Electron microscopy
Engineering and environment geology. Geothermics
Environmental Science and Engineering
Exact sciences and technology
Geochemistry
Geology
Hydrology/Water Resources
Infrared spectroscopy
Metals
Mineralogy
Organic carbon
Original Article
Pollution, environment geology
Sedimentation & deposition
Silicates
Terrestrial Pollution
Water geochemistry
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Summary: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.
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-009-0386-9