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Use of CO 2 to Cure Steel Slag and Gypsum-Based Material

Author

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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)

  • Wentao Hu

    (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

To improve the utilization of steel slag (SS) in CO 2 capture and making building materials, the paper mainly discussed the effects of desulphurization gypsum (DG) and w/s ratio on strength development and CO 2 capture capability of high Al content SS. It showed that 10 wt% DG enhanced the strength of hydration-curing SS by 262% at 28 days. Similarly, adding 6 wt% DG in carbonation-curing SS contributed to increases in strength and CO 2 uptake by 283% and 33.54%, reaching 42.68 MPa and 19.12%, respectively. Strength decreases and CO 2 uptake increases with w/s. Microanalysis (QXRD, SEM-EDS, TG-DTG, FTIR, XPS, and MIP) revealed that the main hydration products of SS were C-S-H gel and C 4 AH 13 , which transformed to ettringite with DG addition. The carbonation products were mainly calcite and aragonite. Additionally, the amount of aragonite, mechanically weaker than calcite, decreased and calcite increased significantly when DG was added in carbonation-curing samples, providing a denser structure and higher strength than those without DG. Furthermore, high Al 2p binding energies revealed the formation of monocarboaluminate in the DG-added carbonation samples, corresponding to higher CO 2 uptake. This study provides guidance for the preparation of SS-DG carbide building materials.

Suggested Citation

  • Xue Wang & Wen Ni & Jiajie Li & Siqi Zhang & Keqing Li & Wentao Hu, 2021. "Use of CO 2 to Cure Steel Slag and Gypsum-Based Material," Energies, MDPI, vol. 14(16), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:5174-:d:618972
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    References listed on IDEAS

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