SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 43 ›› Issue (3): 14-23.DOI: 10.1016/j.cjche.2022.02.002

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Electrochemical CO2 mineralization for red mud treatment driven by hydrogen-cycled membrane electrolysis

Heping Xie1,2, Yunpeng Wang1, Tao Liu3, Yifan Wu3, Wenchuan Jiang3, Cheng Lan3, Zhiyu Zhao3, Liangyu Zhu4, Dongsheng Yang3   

  1. 1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2. Institute of Deep Earth Science and Green Energy, Shenzhen University, Shenzhen 518060, China;
    3. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China;
    4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
  • 收稿日期:2021-08-30 修回日期:2022-02-03 出版日期:2022-03-28 发布日期:2022-04-28
  • 通讯作者: Heping Xie,E-mail:Xiehp@scu.edu.cn
  • 基金资助:
    This work was funded by the Science and Technology Department of Sichuan Province (2020YFH0012). We also thank the Analysis and Testing Center of Sichuan University and Ceshigo Research for help in characterizations.

Electrochemical CO2 mineralization for red mud treatment driven by hydrogen-cycled membrane electrolysis

Heping Xie1,2, Yunpeng Wang1, Tao Liu3, Yifan Wu3, Wenchuan Jiang3, Cheng Lan3, Zhiyu Zhao3, Liangyu Zhu4, Dongsheng Yang3   

  1. 1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2. Institute of Deep Earth Science and Green Energy, Shenzhen University, Shenzhen 518060, China;
    3. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China;
    4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
  • Received:2021-08-30 Revised:2022-02-03 Online:2022-03-28 Published:2022-04-28
  • Contact: Heping Xie,E-mail:Xiehp@scu.edu.cn
  • Supported by:
    This work was funded by the Science and Technology Department of Sichuan Province (2020YFH0012). We also thank the Analysis and Testing Center of Sichuan University and Ceshigo Research for help in characterizations.

摘要: CO2 mineralization as a promising CO2 mitigation strategy can employ industrial alkaline solid wastes to achieve net emission reduction of atmospheric CO2. The red mud is a strong alkalinity waste residue produced from the aluminum industry by the Bayer process which has the potential for the industrial CO2 large scale treatment. However, limited by complex components of red mud and harsh operating conditions, it is challenging to directly mineralize CO2 using red mud to recover carbon and sodium resources and to produce mineralized products simultaneously with high economic value efficiently. Herein, we propose a novel electrochemical CO2 mineralization strategy for red mud treatment driven by hydrogen-cycled membrane electrolysis, realizing mineralization of CO2 efficiently and recovery of carbon and sodium resources with economic value. The system utilizes H2 as the redox-active proton carrier to drive the cathode and anode to generate OH- and H+ at low voltage, respectively. The H+ plays as a neutralizer for the alkalinity of red mud and the OH- is used to mineralize CO2 into generate high-purity NaHCO3 product. We verify that the system can effectively recover carbon and sodium resources in red mud treatment process, which shows that the average electrolysis efficiency is 95.3% with high-purity (99.4%) NaHCO3 product obtained. The low electrolysis voltage of 0.453 V is achieved at 10 mA·cm-2 in this system indicates a potential low energy consumption industrial process. Further, we successfully demonstrate that this process has the ability of direct efficient mineralization of flue gas CO2 (15% volume) without extra capturing, being a novel potential strategy for carbon neutralization.

关键词: CO2 mineralization, Red mud, Electrolysis, Waste treatment, Flue gas

Abstract: CO2 mineralization as a promising CO2 mitigation strategy can employ industrial alkaline solid wastes to achieve net emission reduction of atmospheric CO2. The red mud is a strong alkalinity waste residue produced from the aluminum industry by the Bayer process which has the potential for the industrial CO2 large scale treatment. However, limited by complex components of red mud and harsh operating conditions, it is challenging to directly mineralize CO2 using red mud to recover carbon and sodium resources and to produce mineralized products simultaneously with high economic value efficiently. Herein, we propose a novel electrochemical CO2 mineralization strategy for red mud treatment driven by hydrogen-cycled membrane electrolysis, realizing mineralization of CO2 efficiently and recovery of carbon and sodium resources with economic value. The system utilizes H2 as the redox-active proton carrier to drive the cathode and anode to generate OH- and H+ at low voltage, respectively. The H+ plays as a neutralizer for the alkalinity of red mud and the OH- is used to mineralize CO2 into generate high-purity NaHCO3 product. We verify that the system can effectively recover carbon and sodium resources in red mud treatment process, which shows that the average electrolysis efficiency is 95.3% with high-purity (99.4%) NaHCO3 product obtained. The low electrolysis voltage of 0.453 V is achieved at 10 mA·cm-2 in this system indicates a potential low energy consumption industrial process. Further, we successfully demonstrate that this process has the ability of direct efficient mineralization of flue gas CO2 (15% volume) without extra capturing, being a novel potential strategy for carbon neutralization.

Key words: CO2 mineralization, Red mud, Electrolysis, Waste treatment, Flue gas