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Article

Potential Effect of Porosity Evolution of Cemented Paste Backfill on Selective Solidification of Heavy Metal Ions

1
Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
2
International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China
3
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(3), 814; https://doi.org/10.3390/ijerph17030814
Received: 3 December 2019 / Revised: 12 January 2020 / Accepted: 20 January 2020 / Published: 28 January 2020
Cemented paste backfill (CPB) is a common environmentally friendly mining approach. However, it remains undetermined whether CPB pollutes underground mine water. Tank leaching analysis of a CPB mass in distilled water was performed for 120 d, and water quality was tested in situ for a long-term pollution assessment. Computerized tomography was also used to determine the CPB micro-pore structure and ion-leaching mechanism. The dissolved Zn2+, Pb2+ and As5+ concentrations in the leachate peaked at 0.56, 0.11 and 0.066 mg/L, respectively, whereas the Co2+ and Cd2+ concentrations were lower than the detection limit. The CPB porosity decreased from 46.07% to 40.88% by soaking, and 80% of the pore diameters were less than 13.81 μm. The permeability decreased from 0.8 to 0.5 cm/s, and the quantity, length, and diameter of the permeate channels decreased with soaking. An in-situ survey showed novel selective solidification. The Zn2+ concentration in the mine water was 10–20 times that of the background water, and the Pb2+ concentration was 2–4 times the regulated value. Although the Pb2+ content decreased significantly with mining depth, there remains a serious environmental risk. Mine water pollution can be reduced by adding a solidifying agent for Pb2+ and Zn2+, during CPB preparation. View Full-Text
Keywords: cemented paste backfill; tailings management; underground water pollution; heavy metal ions; selective solidification cemented paste backfill; tailings management; underground water pollution; heavy metal ions; selective solidification
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MDPI and ACS Style

Yang, Y.; Zhao, T.; Jiao, H.; Wang, Y.; Li, H. Potential Effect of Porosity Evolution of Cemented Paste Backfill on Selective Solidification of Heavy Metal Ions. Int. J. Environ. Res. Public Health 2020, 17, 814. https://doi.org/10.3390/ijerph17030814

AMA Style

Yang Y, Zhao T, Jiao H, Wang Y, Li H. Potential Effect of Porosity Evolution of Cemented Paste Backfill on Selective Solidification of Heavy Metal Ions. International Journal of Environmental Research and Public Health. 2020; 17(3):814. https://doi.org/10.3390/ijerph17030814

Chicago/Turabian Style

Yang, Yixuan, Tongqian Zhao, Huazhe Jiao, Yunfei Wang, and Haiyan Li. 2020. "Potential Effect of Porosity Evolution of Cemented Paste Backfill on Selective Solidification of Heavy Metal Ions" International Journal of Environmental Research and Public Health 17, no. 3: 814. https://doi.org/10.3390/ijerph17030814

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