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Study on Mineral Compositions of Direct Carbonated Steel Slag by QXRD, TG, FTIR, and XPS

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  • Xue Wang

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China)

  • Wen Ni

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China)

  • Jiajie Li

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China)

  • Siqi Zhang

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China)

  • Keqing Li

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China)

Abstract

Steel slag CO 2 sequestration helps mitigate global warming and decrease the stockpile of steel slag (SS). Through orthogonal design tests and single-factor tests, this paper evaluated the effects of the water/solid mass ratio (w/s), gypsum ratio (G/SS), molding pressure, and curing duration on uniaxial compressive strength (UCS) and CO 2 uptake of the compacts. The results indicated that high w/s enhanced both strength and CO 2 capture ability. The proper addition of gypsum helps promote UCS increase and CO 2 uptake of steel slag. In addition, increasing the molding pressure can significantly improve UCS without reducing CO 2 uptake. The optimum conditions in the study were a w/s of 0.20, G/SS of 1/16, and molding pressure of 27 MPa, under which conditions 1 d UCS and CO 2 uptake were 55.30 MPa and 12.36%, respectively. Microanalyses showed that gypsum activates mainly mayenite in steel slag. An increase in water addition also increased the hydration and carbonation products greatly, and the strengthened molding pressure had a significant densification effect on micro-pore structures. The study gives guidance in the application of steel slag in CO 2 capture and manufacturing green construction material.

Suggested Citation

  • Xue Wang & Wen Ni & Jiajie Li & Siqi Zhang & Keqing Li, 2021. "Study on Mineral Compositions of Direct Carbonated Steel Slag by QXRD, TG, FTIR, and XPS," Energies, MDPI, vol. 14(15), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:15:p:4489-:d:600901
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    References listed on IDEAS

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    1. Said, Arshe & Laukkanen, Timo & Järvinen, Mika, 2016. "Pilot-scale experimental work on carbon dioxide sequestration using steelmaking slag," Applied Energy, Elsevier, vol. 177(C), pages 602-611.
    2. Ren, Shan & Aldahri, Tahani & Liu, Weizao & Liang, Bin, 2021. "CO2 mineral sequestration by using blast furnace slag: From batch to continuous experiments," Energy, Elsevier, vol. 214(C).
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