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 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2022年第3期14-23,共10页中国化学工程学报（英文版）

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

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 treatment.However,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 efficiently.Herein,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 value.The system utilizes H_(2)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 CO_(2)into generate highpurity NaHCO_(3)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 highpurity(99.4%)NaHCO_(3)product obtained.The low electrolysis voltage of 0.453 V is achieved at10 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 CO_(2)(15%volume)without extra capturing,being a novel potential strategy for carbon neutralization.

关 键 词：CO_(2)mineralization Red mud ELECTROLYSIS Waste treatment Flue gas 

分 类 号：X701[环境科学与工程—环境工程] X758