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

作　　者：Yumeng Li Qing Zhao Xiaohui Mei Chengjun Liu Henrik Saxén Ron Zevenhoven 

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,China [2]School of Metallurgy,Northeastern University,Shenyang 110819,China [3]Institute for Frontier Technologies of Low-Carbon Steelmaking,Northeastern University,Shenyang 110819,China [4]Process and Systems Engineering Laboratory,Åbo Akademi University,Åbo/Turku 20500,Finland

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第11期2182-2190,共9页矿物冶金与材料学报（英文版）

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)。

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).

关 键 词：steel slag carbon dioxide capture SORBENT CHEMISORPTION KINETICS 

分 类 号：TQ424[化学工程]