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Remediation of Acid Mine Drainage (AMD) Using Steel Slag: Mechanism of the Alkalinity Decayed Process

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  • Lei Yang

    (School of Geosciences and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
    Guizhou Zhonggui Environmental Technology Co., Ltd., Guiyang 550008, China)

  • Yuegang Tang

    (School of Geosciences and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China)

  • Duanning Cao

    (School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Mingyuan Yang

    (School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China)

Abstract

Steel slag has been proven to be an effective environment remediation media for acid neutralization, and a potential aid to mitigate acid mine drainage (AMD). Yet its acid neutralization capacity (ANC) is frequently inhibited by precipitate after a period of time, while the characteristics of the precipitate formation process are unclear yet. In this study, ANC for basic oxygen steel slag was conducted by neutralization experiments with dilute sulfuric acid (0.1 M) and real AMD. Some partially neutralized steel slag samples were determined by X-ray diffraction (XRD), scanning electron microscopy combined with an energy dispersive spectrometer (SEM-EDS), and N 2 adsorption tests to investigate the potential formation process of the precipitate. The results indicated that Ca-bearing constitutes leaching and sulfate formation were two main reactions throughout the neutralization process. A prominent transition turning point from leaching to precipitate was at about 40% of the neutralization process. Tricalcium silicate (Ca 3 SiO 5 ) played a dominant role in the alkalinity-releasing stage among Ca-bearing components, while the new-formed well crystalline CaSO 4 changed the microstructure of steel slag and further hindered alkaline components releasing. For steel slag of 200 mesh size, the ANC value for the steel slag sample was 8.23 mmol H + /g when dilute sulfate acid was used. Neutralization experiments conducted by real AMD confirmed that the steel slag ANC was also influenced by the high contaminants, such as Fe 2+ , due to the hydroxides precipitate reactions except for sulfate formation reactions.

Suggested Citation

  • Lei Yang & Yuegang Tang & Duanning Cao & Mingyuan Yang, 2023. "Remediation of Acid Mine Drainage (AMD) Using Steel Slag: Mechanism of the Alkalinity Decayed Process," IJERPH, MDPI, vol. 20(4), pages 1-15, February.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:4:p:2805-:d:1058227
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    References listed on IDEAS

    as
    1. Xinhui Zhan & Liping Xiao & Bing Liang, 2019. "Removal of Pb(II) from Acid Mine Drainage with Bentonite-Steel Slag Composite Particles," Sustainability, MDPI, vol. 11(16), pages 1-17, August.
    2. James Manchisi & Elias Matinde & Neil A. Rowson & Mark J. H. Simmons & Geoffrey S. Simate & Sehliselo Ndlovu & Brian Mwewa, 2020. "Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities," Sustainability, MDPI, vol. 12(5), pages 1-47, March.
    3. Bonokwakhe Hezekiel Sukati & Pieter Christiaan De Jager & John George Annandale & Philip Dale Tanner, 2018. "The Hazardous Status of High Density Sludge from Acid Mine Drainage Neutralization," Sustainability, MDPI, vol. 10(11), pages 1-18, November.
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