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Received May 10, 2021
Accepted June 19, 2021
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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
1School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea 2Department of Earth and Environmental Engineering, Columbia University, 500 W. 120th St, New York, NY 10027, United States, USA 3Lenfest Center for Sustainable Energy, The Earth Institute, Columbia University, 500 W. 120th St, New York, NY 10027, United States, USA
Korean Journal of Chemical Engineering, November 2021, 38(11), 2279-2285(7), 10.1007/s11814-021-0874-5
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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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