CO2 mineralization of carbide slag for the production of light calcium carbonates

doi:10.1016/j.cjche.2022.02.011

中国化学工程学报 ›› 2022, Vol. 43 ›› Issue (3): 86-98.DOI: 10.1016/j.cjche.2022.02.011

CO₂ mineralization of carbide slag for the production of light calcium carbonates

Tongyang Zhang¹, Guanrun Chu¹, Junlin Lyu¹, Yongda Cao¹, Wentao Xu¹, Kui Ma¹, Lei Song¹, Hairong Yue^1,2, Bin Liang^1,2

1. Low Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China

收稿日期:2021-08-31 修回日期:2022-02-13 出版日期:2022-03-28 发布日期:2022-04-28
通讯作者: Hairong Yue,E-mail:hryue@scu.edu.cn
基金资助:
The authors are grateful for the support from National Natural Science Foundation of China (22078208), and the Major Science and Technology Projects of Inner Mongolia Autonomous Region (2020ZD0025). This work also acknowledges China Chengda Engineering Co., Ltd. for its software support.

CO₂ mineralization of carbide slag for the production of light calcium carbonates

Tongyang Zhang¹, Guanrun Chu¹, Junlin Lyu¹, Yongda Cao¹, Wentao Xu¹, Kui Ma¹, Lei Song¹, Hairong Yue^1,2, Bin Liang^1,2

1. Low Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China

Received:2021-08-31 Revised:2022-02-13 Online:2022-03-28 Published:2022-04-28
Contact: Hairong Yue,E-mail:hryue@scu.edu.cn
Supported by:
The authors are grateful for the support from National Natural Science Foundation of China (22078208), and the Major Science and Technology Projects of Inner Mongolia Autonomous Region (2020ZD0025). This work also acknowledges China Chengda Engineering Co., Ltd. for its software support.

摘要/Abstract

摘要： The production of polyvinyl chloride by calcium carbide method is a typical chemical process with high coal consumption, leading to massive flue gas and carbide slag emissions. Currently, the carbide slag with high CaO content is usually stacked in residue field, easily draining away with the rain and corroding the soil. In this work, we coupled the treatment of flue gas and carbide slag to propose a facile CO₂ mineralization route to prepare light calcium carbonate. And the route feasibility was comprehensively evaluated via experiments and simulation. Through experimental investigation, the Ca²⁺ leaching and mineralization reaction parameters were determined. Based on the experiment, a process was built and optimized through Aspen Plus, and the energy was integrated to obtain the overall process energy and material consumption. Finally, the net CO₂ emission reduction rate of the entire process through the life-cycle assessment method was analyzed. Moreover, the relationship between the parameters and the CO₂ emission life-cycle assessment was established. The final optimization results showed that the mineralization process required 1154.69 kW·h·(t CO₂)^-1 of energy (including heat energy of 979.32 kW·h·(t CO₂)^-1 and electrical energy of 175.37 kW·h·(t CO₂)^-1), and the net CO₂ emission reduction rate was 35.8%. The light CaCO₃ product can be sold as a high value-added product. According to preliminary economic analysis, the profit of mineralizing can reach more than 2,100 CNY·(t CO₂)^-1.

关键词: CO₂ mineralization, Calcium carbide slag, Light calcium carbonate, Process simulation, Life-cycle assessment

Abstract: The production of polyvinyl chloride by calcium carbide method is a typical chemical process with high coal consumption, leading to massive flue gas and carbide slag emissions. Currently, the carbide slag with high CaO content is usually stacked in residue field, easily draining away with the rain and corroding the soil. In this work, we coupled the treatment of flue gas and carbide slag to propose a facile CO₂ mineralization route to prepare light calcium carbonate. And the route feasibility was comprehensively evaluated via experiments and simulation. Through experimental investigation, the Ca²⁺ leaching and mineralization reaction parameters were determined. Based on the experiment, a process was built and optimized through Aspen Plus, and the energy was integrated to obtain the overall process energy and material consumption. Finally, the net CO₂ emission reduction rate of the entire process through the life-cycle assessment method was analyzed. Moreover, the relationship between the parameters and the CO₂ emission life-cycle assessment was established. The final optimization results showed that the mineralization process required 1154.69 kW·h·(t CO₂)^-1 of energy (including heat energy of 979.32 kW·h·(t CO₂)^-1 and electrical energy of 175.37 kW·h·(t CO₂)^-1), and the net CO₂ emission reduction rate was 35.8%. The light CaCO₃ product can be sold as a high value-added product. According to preliminary economic analysis, the profit of mineralizing can reach more than 2,100 CNY·(t CO₂)^-1.

Key words: CO₂ mineralization, Calcium carbide slag, Light calcium carbonate, Process simulation, Life-cycle assessment

Tongyang Zhang, Guanrun Chu, Junlin Lyu, Yongda Cao, Wentao Xu, Kui Ma, Lei Song, Hairong Yue, Bin Liang. CO₂ mineralization of carbide slag for the production of light calcium carbonates[J]. 中国化学工程学报, 2022, 43(3): 86-98.

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CO₂ mineralization of carbide slag for the production of light calcium carbonates

CO₂ mineralization of carbide slag for the production of light calcium carbonates

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