摘要
Steelmaking industry faces urgent demands for both steel slag utilization and CO_(2)abatement.Ca and Mg of steel slag can be extracted by acid solution and used to prepare sorbents for CO_(2)capture.In this work,the calcium-based sorbents were prepared from stainless steel slag leachate by co-precipitation,and the initial CO_(2)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 CO_(2)chemisorption capacity of the calcium-based sorbents were investigated.The results show that the optimal Ca/Mg molar ratio of sorbent for CO_(2)capture was4.2:1,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 CO_(2)chemisorption,and the activation energy of the first stage(reaction control)was found to be lower than that of the second stage(diffusion control).
基金
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)
the Fundamental Research Funds for the Central Universities,China(Nos.N2201023,N2325009)。
