从钢渣浸出液中制备钙基吸附剂：钙镁比的影响

李宇蒙; 赵青; 梅孝辉; 刘承军; Henrik Saxén; Ron Zevenhoven

doi:10.1007/s12613-023-2657-y

Volume 30 Issue 11

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文章导航 > 矿物冶金与材料学报（英文） > 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

Cite this article as:

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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研究论文

从钢渣浸出液中制备钙基吸附剂：钙镁比的影响

1)
东北大学多金属共生矿生态化冶金教育部重点实验室，沈阳110819，中国
2)
东北大学冶金学院，沈阳 110819，中国
3)
东北大学低碳钢铁前沿技术研究院，沈阳110819，中国
4)
埃博学术大学过程与系统工程实验室，埃博/图尔库20500，芬兰

通讯作者:
赵青 E-mail: zhaoq@smm.neu.edu.cn

文章亮点

(1) MgO加入量多或少都不利于提高钙基吸附剂的CO₂吸附能力，确定适宜的MgO含量是非常有必要的；

(2) 钙基吸附剂的动力学吸附过程存在两个阶段，且第一阶段（反应控制）的活化能低于第二阶段（扩散控制）的活化能；

(3) 钙基吸附剂的“自活化”现象提高了吸附剂的CO₂吸附能力，从而验证了吸附剂中MgO的骨架支撑作用。

中文摘要

中国的钢铁行业面临着钢渣利用和CO₂减排的迫切需求, 而钢渣中的Ca和Mg可以用酸溶液萃取，制备捕集CO₂的吸附剂。本文以渣渗滤液为原料，采用共沉淀法制备了钙基吸附剂，其对CO₂的初始CO₂化学吸附容量为0.40 g/g。此外，本文还研究了Ca/Mg摩尔比对钙基吸附剂的形貌、结构和CO₂化学吸附能力的影响。结果表明对CO₂吸附能力最佳的吸附剂是Ca/Mg摩尔比为4.2:1的, 证明了氧化镁在钙基吸附剂中的骨架支撑作用。通过Avrami-Erofeev模型研究了钙基吸附剂的化学吸附动力学，发现CO₂吸附存在两个过程，且第一阶段（反应控制）的活化能低于第二阶段（扩散控制）的活化能。

关键词:

Research Article

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

+ Author Affiliations

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

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.
The online version contains supplementary material available at https://doi.org/10.1007/s12613-023-2657-y

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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