Next Article in Journal
Parenting Desire and Minority Stress in Lesbians and Gay Men: A Mediation Framework
Next Article in Special Issue
Effects of Different Grazing Intensities on Soil C, N, and P in an Alpine Meadow on the Qinghai—Tibetan Plateau, China
Previous Article in Journal
You Can’t Find Healthy Food in the Bush: Poor Accessibility, Availability and Adequacy of Food in Rural Australia
Previous Article in Special Issue
Spatial Assessment of Anthropogenic Impact on Trace Metal Accumulation in Farmland Soils from a Rapid Industrializing Region, East China
Article

Fly Ash Modified Coalmine Solid Wastes for Stabilization of Trace Metals in Mining Damaged Land Reclamation: A Case Study in Xuzhou Coalmine Area

1
School of Environment Science and Spatial Informatics, China University of Mining and Technology, 221116 Xuzhou, China
2
State Key Laboratory for Geomechnics and Deep Underground Engineering, 221116 Xuzhou, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2018, 15(10), 2317; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15102317
Received: 14 August 2018 / Revised: 18 October 2018 / Accepted: 19 October 2018 / Published: 21 October 2018
In China, coalmine wastes, such as gangues, are used for reclamation of mining subsided land. However, as waste rocks, gangues contain several trace metal elements, which could be released under natural weathering and hydrodynamic leaching effects and then migrate into the reclamed soil layer. However, it is very difficult to find adequate other backfill materials for substitution of gangues. In this paper, we present a novel method and case study to restrict the migration ability of trace metal elements in gangues by using another kind of coalmine solid waste—fly ashes from coal combustion. In this study, fly ashes were mixed with gangues in different mass proportions 1:0.2, 1:0.4, 1:0.6 and 1:0.8 as new designed backfill materials. Due to the help of fly ash, the occurrence states of studied trace metal elements were greatly changed, and their releasing and migration ability under hydrodynamic leaching effect were also significantly restricted. In this research seven trace metal elements in gangues Cu, Zn, Pb, Cd, Cr, Mn and Ni were studied by using soil column hydrodynamical leaching method and simulated precipitation for one year. The results show that under the driving of natural precipitation trace metal elements were generally transported deep inside the reconstructed land base, i.e., far away from soil layer and most of the trace metal elements were transformed into a bonded state, or combined in inert occurrence states, especially the residual state. With this method, the migration activities of tested trace metal elements were greatly restricted and the environmental potential risk could be significantly reduced. View Full-Text
Keywords: mining gangues; subsidence backfill; occurrence states transformation; element migration mining gangues; subsidence backfill; occurrence states transformation; element migration
Show Figures

Figure 1

MDPI and ACS Style

Huang, J.; Wang, P.; Xu, C.; Zhu, Z. Fly Ash Modified Coalmine Solid Wastes for Stabilization of Trace Metals in Mining Damaged Land Reclamation: A Case Study in Xuzhou Coalmine Area. Int. J. Environ. Res. Public Health 2018, 15, 2317. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15102317

AMA Style

Huang J, Wang P, Xu C, Zhu Z. Fly Ash Modified Coalmine Solid Wastes for Stabilization of Trace Metals in Mining Damaged Land Reclamation: A Case Study in Xuzhou Coalmine Area. International Journal of Environmental Research and Public Health. 2018; 15(10):2317. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15102317

Chicago/Turabian Style

Huang, Jiu, Peng Wang, Chaorong Xu, and Zhuangzhuang Zhu. 2018. "Fly Ash Modified Coalmine Solid Wastes for Stabilization of Trace Metals in Mining Damaged Land Reclamation: A Case Study in Xuzhou Coalmine Area" International Journal of Environmental Research and Public Health 15, no. 10: 2317. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15102317

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop