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Vol. 26 No. 22 (2014): Vol 26 Issue 22

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Effects of Weathering on the Release of Heavy Metals from Coal Gangue

https://doi.org/10.14233/ajchem.2014.16757
Ya-Qiao Sun
School of Environmental Science and Engineering, Chang'an University, No. 126 Yanta Road, Xi’an 710054, P.R. China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, No. 126 Yanta Road, Xi’an 710054, P.R. China; Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province, Xi'an 710054, P.R. China
Yuan-Yuan Shen
School of Environmental Science and Engineering, Chang'an University, No. 126 Yanta Road, Xi’an 710054, P.R. China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, No. 126 Yanta Road, Xi’an 710054, P.R. China; Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province, Xi'an 710054, P.R. China
Lei Duan
School of Environmental Science and Engineering, Chang'an University, No. 126 Yanta Road, Xi’an 710054, P.R. China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, No. 126 Yanta Road, Xi’an 710054, P.R. China; Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province, Xi'an 710054, P.R. China
Lin Dou
School of Environmental Science and Engineering, Chang'an University, No. 126 Yanta Road, Xi’an 710054, P.R. China

Corresponding Author(s) : Ya-Qiao Sun

sunyaqiao@126.com

Asian Journal of Chemistry, Vol. 26 No. 22 (2014): Vol 26 Issue 22

Abstract

The effect of weathering on the release of heavy metals from coal gangue was revealed. The XRD, SEM and Tessier five-step extraction method were applied to analyze mineral composition, mineral structure and chemical specification of heavy metals from coal gangue. The results showed that after 7-year weathering, the release rate of heavy metals with high mobility, such as Co, Cu and Pb, was 21.69, 36.49 and 36.73 %, respectively. The release rate of Cr and Zn was only 1.46 and 1.32 %, respectively. Both Mn and Fe were enriched and increased by 42.85 and 15.51 % with an increase of S content. Also, the formation of large amounts of iron colloids due to the weathering could facilitate the adsorption and complexation heavy metals. As a result, residual percentage content of heavy metals Cd, Co, Cu, Ni, Pb and Zn increased by 0.52, 12.85, 0.90, 4.53, 3.47 and 0.01 %, respectively.

Keywords

Weathering Release of heavy metals Influence mechanism Coal gangue
Sun, Y.-Q., Shen, Y.-Y., Duan, L., & Dou, L. (2014). Effects of Weathering on the Release of Heavy Metals from Coal Gangue. Asian Journal of Chemistry, 26(22), 7532–7538. https://doi.org/10.14233/ajchem.2014.16757
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