Synergistic CO_(2) mineralization using coal fly ash and red mud as a composite system  

作　　者：Zhenchao Yao Yugao Wang Jun Shen Yanxia Niu Jiang Feng Yang Xianyong Wei 

机构地区：[1]School of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan,Shanxi,030024,China [2]Key Laboratory of Coal Processing and Efficient Utilization,Ministry of Education,University of Mining&Technology,221116,Xuzhou,Jiangsu,China

出　　处：《International Journal of Coal Science & Technology》2024年第3期149-158,共10页国际煤炭科学技术学报（英文）

基　　金：National Natural Science Foundation of China(21706172);Shanxi Province Natural Science Foundation(202203021221069 and 20210302123167).

摘　　要：CO_(2) mineralization plays a critical role in the storage and utilization of CO_(2).Coal fly ash(CFA)and red mud(RM)are widely utilized as CO_(2) mineralizers.However,the inert calcium species in CFA limit its carbonation capacity,meanwhile the substantial Ca^(2+)releasing of RM is hindered by a covering layer of calcium carbonate.In this study,CO_(2) mineralization in a composite system of CFA and RM was investigated to enhance the carbonation capacity.Multiple analyzers were employed to characterize the raw materials and resulting mineralization products.The results demonstrated that a synergistic effect existed in the composite system of CFA and RM,resulting in improving CO_(2) mineralization rate and efficiency.The produced calcium carbonate was ectopically attached the surface of CFA in the composite system,thus slowing down its coverage on the surface of RM.This phenomenon facilitated further releasing Ca^(2+)from the internal RM,thereby enhancing CO_(2) mineralization efficiency.Meanwhile,the inclusion of RM significantly improved the alkalinity of the composite system,which not only promoted the dissolution of Ca^(2+)of the inert CaSO_(4)(H_(2)O)_(2) in CFA,but also accelerated CO_(2) mineralization rate.The investigation would be beneficial to CO_(2) mineralization using industrial solid wastes.

关 键 词：CO_(2)mineralization Coal fly ash Red mud Synergistic effect 

分 类 号：TB33[一般工业技术—材料科学与工程]