Synergistic CO2 mineralization using coal fly ash and red mud as a composite system
Zhenchao Yao1
Yugao Wang1
Jun Shen1
Yanxia Niu1
Jiang Feng Yang1
Xianyong Wei2
1.School of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China2.Key Laboratory of Coal Processing and Efficient Utilization,Ministry of Education,University of Mining & Technology,221116 Xuzhou,Jiangsu,China
摘要：CO2 mineralization plays a critical role in the storage and utilization of CO2.Coal fly ash(CFA)and red mud(RM)are widely utilized as CO2 mineralizers.However,the inert calcium species in CFA limit its carbonation capacity,meanwhile the substantial Ca2+releasing of RM is hindered by a covering layer of calcium carbonate.In this study,CO2 mineraliza-tion 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 synergis-tic effect existed in the composite system of CFA and RM,resulting in improving CO2 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 Ca2+from the internal RM,thereby enhancing CO2 mineralization efficiency.Meanwhile,the inclusion of RM significantly improved the alkalinity of the composite system,which not only promoted the dissolution of Ca2+of the inert CaSO4(H2O)2 in CFA,but also acceler-ated CO2 mineralization rate.The investigation would be beneficial to CO2 mineralization using industrial solid wastes.
机标关键词：compositesystemcoalmineralizationsynergisticusing
论文发表日期：2024-06-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：10( 149-158 )
英文信息