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Evaluation of elemental leaching behavior and morphological changes of steel slag in both acidic and basic conditions for carbon sequestration potential

  • Environmental Engineering
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Abstract

Carbon mineralization technology involves reactions between carbon dioxide (CO2) and alkali earth metals such as calcium and/or magnesium to form thermodynamically stable solid carbonates (i.e., CaCO3, and MgCO3), and is currently being recognized as a promising method of both storing and utilizing CO2. In particular, industrial solid wastes such as steelmaking slags (steel and iron slags) are considered to be suitable alkaline feedstock for carbon mineralization. The aqueous carbon mineralization process of steelmaking slags generally includes the extraction of alkali earth metals in a low pH condition, followed by carbonation with CO2 at a high pH. However, since steelmaking slags often exhibit limited leachability depending on their physicochemical properties, it often has an important role in the design of the carbon mineralization process. Here, the leachability of the steel slag was examined in both acidic and basic conditions. The extraction kinetics as well as the various operating factors, such as temperature, and particle size distribution, under an acidic condition were also examined for the potential carbon sequestration using the alkaline wastes.

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Acknowledgement

This work was supported by “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (No. 20194010000220).

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Authors and Affiliations

  1. School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Korea

    Sujin Hong & Youngjune Park

  2. Department of Earth and Environmental Engineering, Columbia University, 500 W. 120th St, New York, NY, 10027, USA

    Ah-Hyung Alissa Park

  3. Lenfest Center for Sustainable Energy, The Earth Institute, Columbia University, 500 W. 120th St, New York, NY, 10027, USA

    Ah-Hyung Alissa Park

  4. Department of Chemical Engineering, Columbia University, 500 W. 120th St, New York, NY, 10027, USA

    Ah-Hyung Alissa Park

Authors
  1. Sujin Hong
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  2. Ah-Hyung Alissa Park
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  3. Youngjune Park
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Correspondence to Youngjune Park.

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Hong, S., Park, AH.A. & Park, Y. Evaluation of elemental leaching behavior and morphological changes of steel slag in both acidic and basic conditions for carbon sequestration potential. Korean J. Chem. Eng. 38, 2279–2285 (2021). https://doi.org/10.1007/s11814-021-0874-5

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  • DOI: https://doi.org/10.1007/s11814-021-0874-5

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