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

Author

Listed:
  • Yixuan Yang

    (Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China)

  • Tongqian Zhao

    (Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China)

  • Huazhe Jiao

    (International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Yunfei Wang

    (International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Haiyan Li

    (School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract

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 Zn 2+ , Pb 2+ and As 5+ concentrations in the leachate peaked at 0.56, 0.11 and 0.066 mg/L, respectively, whereas the Co 2+ and Cd 2+ 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 Zn 2+ concentration in the mine water was 10–20 times that of the background water, and the Pb 2+ concentration was 2–4 times the regulated value. Although the Pb 2+ content decreased significantly with mining depth, there remains a serious environmental risk. Mine water pollution can be reduced by adding a solidifying agent for Pb 2+ and Zn 2+, during CPB preparation.

Suggested Citation

  • Yixuan Yang & Tongqian Zhao & Huazhe Jiao & Yunfei Wang & Haiyan Li, 2020. "Potential Effect of Porosity Evolution of Cemented Paste Backfill on Selective Solidification of Heavy Metal Ions," IJERPH, MDPI, vol. 17(3), pages 1-12, January.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:3:p:814-:d:313843
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    Cited by:

    1. Yixuan Yang & Tongqian Zhao & Huazhe Jiao & Li Wu & Chunyan Xiao & Xiaoming Guo & Chao Jin, 2022. "Atmospheric Organic Nitrogen Deposition in Strategic Water Sources of China after COVID-19 Lockdown," IJERPH, MDPI, vol. 19(5), pages 1-14, February.
    2. Yixuan Yang & Tongqian Zhao & Huazhe Jiao & Li Wu & Chunyan Xiao & Xiaoming Guo, 2022. "Types and Distribution of Organic Amines in Organic Nitrogen Deposition in Strategic Water Sources," IJERPH, MDPI, vol. 19(7), pages 1-17, March.

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