期刊
JOURNAL OF GEOCHEMICAL EXPLORATION
卷 88, 期 1-3, 页码 37-40出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.gexplo.2005.08.012
关键词
acid mine drainage; tailings; geochemical modeling; schwertmannite
Acid mine drainage discharged from the abandoned Daduk mine towards the Daduk creek has a pH of 3.3, and concentrations of Al, Mn, Fe, Zn and SO4 of 18, 41, 45, 38 and 1940 mg/L, respectively. In particular, As concentration in acid mine drainage is 1000 mu g/L. Removing order of metal ions normalized by SO4 concentration downstream from discharge point is Fe > As > Al > Cu > Zn > Mn > Cd > Pb. In the Daduk creek, Fe and As are the most rapidly depleted downstream from acid mine drainage because As adsorbs, coprecipitates and forms compounds with ferric oxyhydroxide. From the results of geochemical modeling using the Phreeq C program, goethite (FeOOH) is oversaturated, and schwertmannite (Fe8O8(OH)(4.5)(SO4)(1.75)) is the most stable solid phase at low pH in the Daduk creek. Yellowish red (orange ochre) precipitates that occurred in the study area are probably composed of goethite or schwertmannite. (c) 2005 Published by Elsevier B.V.
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