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Effect of Ca/Mg molar ratio on the calcium-based sorbents

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Abstract

Steelmaking industry faces urgent demands for both steel slag utilization and CO2 abatement. Ca and Mg of steel slag can be extracted by acid solution and used to prepare sorbents for CO2 capture. In this work, the calcium-based sorbents were prepared from stainless steel slag leachate by co-precipitation, and the initial CO2 chemisorption capacity of the calcium-based sorbent prepared from steel slag with the Ca and Mg molar ratio of 3.64:1 was 0.40 g/g. Moreover, the effect of Ca/Mg molar ratio on the morphology, structure, and CO2 chemisorption capacity of the calcium-based sorbents were investigated. The results show that the optimal Ca/Mg molar ratio of sorbent for CO2 capture was 4.2:1, and the skeleton support effect of MgO in calcium-based sorbents was determined. Meanwhile, the chemisorption kinetics of the sorbents was studied using the Avrami-Erofeev model. There were two processes of CO2 chemisorption, and the activation energy of the first stage (reaction control) was found to be lower than that of the second stage (diffusion control).

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52074078), the National Key R&D Program of China (No. 2021YFC2901200), the Applied Fundamental Research Program of Liaoning Province (No. 2023JH2/101600002), the Liaoning Provincial Natural Science Foundation of China (No. 2022-YQ-09), the Shenyang Young Middle-Aged Scientific and Technological Innovation Talent Support Program, China (No. RC220491), the Liaoning Province Steel Industry-University-Research Innovation Alliance Cooperation Project of Bensteel Group, China (No. KJBLM202202), and the Fundamental Research Funds for the Central Universities, China (Nos. N2201023 and N2325009).

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Yumeng Li, Qing Zhao, Xiaohui Mei & Chengjun Liu

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Yumeng Li, Qing Zhao, Xiaohui Mei & Chengjun Liu

  3. Institute for Frontier Technologies of Low-Carbon Steelmaking, Northeastern University, Shenyang, 110819, China

    Qing Zhao

  4. Process and Systems Engineering Laboratory, Åbo Akademi University, Åbo/Turku, 20500, Finland

    Henrik Saxén & Ron Zevenhoven

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  1. Yumeng Li
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Correspondence to Qing Zhao.

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Qing Zhao is a youth editorial board member for IJMMM and is not involved in the editorial review or the decision to publish this article. All authors declare no competing financial interest.

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Li, Y., Zhao, Q., Mei, X. et al. Effect of Ca/Mg molar ratio on the calcium-based sorbents. Int J Miner Metall Mater 30, 2182–2190 (2023). https://doi.org/10.1007/s12613-023-2657-y

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