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

Yumeng Li; Qing Zhao; Xiaohui Mei; Chengjun Liu; Henrik Saxén; Ron Zevenhoven

doi:10.1007/s12613-023-2657-y

Volume 30 Issue 11

Nov. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(11): 2182-2190

Yumeng Li, Qing Zhao, Xiaohui Mei, Chengjun Liu, Henrik Saxén, and Ron Zevenhoven, Effect of Ca/Mg molar ratio on the calcium-based sorbents, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp. 2182-2190. https://doi.org/10.1007/s12613-023-2657-y

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Yumeng Li, Qing Zhao, Xiaohui Mei, Chengjun Liu, Henrik Saxén, and Ron Zevenhoven, Effect of Ca/Mg molar ratio on the calcium-based sorbents, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp. 2182-2190. https://doi.org/10.1007/s12613-023-2657-y

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Research Article

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

+ Author Affiliations

Corresponding author:
Qing Zhao E-mail: zhaoq@smm.neu.edu.cn
Received: 15 February 2023; Revised: 7 April 2023; Accepted: 18 April 2023; Available online: 19 April 2023

Abstract

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).
- steel slag;
- carbon dioxide capture;
- sorbent;
- chemisorption;
- kinetics

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