SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 43 ›› Issue (3): 86-98.DOI: 10.1016/j.cjche.2022.02.011

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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 Yue1,2, Bin Liang1,2   

  1. 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:2022-04-28 Published:2022-03-28
  • 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.

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 Yue1,2, Bin Liang1,2   

  1. 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
  • 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.

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

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