Electrochemical CO_(2) mineralization for red mud treatment driven by hydrogen-cycled membrane electrolysis

作     者：Heping Xie Yunpeng Wang Tao Liu Yifan Wu Wenchuan Jiang Cheng Lan Zhiyu Zhao Liangyu Zhu Dongsheng Yang Heping Xie;Yunpeng Wang;Tao Liu;Yifan Wu;Wenchuan Jiang;Cheng Lan;Zhiyu Zhao;Liangyu Zhu;Dongsheng Yang

作者机构：School of Chemical EngineeringSichuan UniversityChengdu 610065China Institute of Deep Earth Science and Green EnergyShenzhen UniversityShenzhen 518060China Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu 610065China State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu 610500China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2022年第35卷第3期

页      面：14-23页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0817[工学-化学工程与技术] 08[工学] 

基　　金：funded by the Science and Technology Department of Sichuan Province(2020YFH0012) 

主　　题：CO_(2)mineralization Red mud Electrolysis Waste treatment Flue gas 

摘      要：CO_(2)mineralization as a promising CO_(2)mitigation strategy can employ industrial alkaline solid wastes to achieve net emission reduction of atmospheric CO_(2).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 CO_(2)large scale ***,limited by complex components of red mud and harsh operating conditions,it is challenging to directly mineralize CO_(2)using red mud to recover carbon and sodium resources and to produce mineralized products simultaneously with high economic value ***,we propose a novel electrochemical CO_(2)mineralization strategy for red mud treatment driven by hydrogen-cycled membrane electrolysis,realizing mineralization of CO_(2)efficiently and recovery of carbon and sodium resources with economic *** system utilizes H_(2)as the redox-active proton carrier to drive the cathode and anode to generate OH^(-) and H^(+) at low voltage,*** H^(+) plays as a neutralizer for the alkalinity of red mud and the OH^(-) is used to mineralize CO_(2)into generate highpurity NaHCO_(3)*** 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 highpurity(99.4%)NaHCO_(3)product *** low electrolysis voltage of 0.453 V is achieved at10 mA·cm^(-2) in this system indicates a potential low energy consumption industrial ***,we successfully demonstrate that this process has the ability of direct efficient mineralization of flue gas CO_(2)(15%volume)without extra capturing,being a novel potential strategy for carbon neutralization.