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- 저자 : Changlei Qin (검색결과 2 건)
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Cong Luo,Ying Zheng,Yongqing Xu,Haoran Ding,Chuguang Zheng,Changlei Qin,Bo Feng 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5
A novel calcium-based pellet was prepared by extrusion of sol-gel CaO powder and cement with high aluminum- based content. Limestone was used for comparison. The cyclic CO2 capture performance and carbonation kinetics of the sorbents were investigated in a thermogravimetric analyzer (TGA). The changes in phase and microstructure were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer Emmet Teller (BET) surface area, respectively. The results indicate that the pellet consisted of CaO and Ca12Al14O33 after initial calcination. Limestone reactivity decreased dramatically with the increase in the cycle number, whereas the pellet showed a relatively stable cyclic CO2 capture performance with high reactivity. The CO2 capture capacity of the pellet achieved 0.43 g CO2/g sorbent after 50 cycles at 650 oC and 850 oC for carbonation and calcination, respectively. Moreover, the pellet obtained fast carbonation rates with slight decay after multiple cycles. The porous microstructure of the pellet contributed to the high reactivity of the sorbent during high temperature reactions, and the support material of Ca12Al14O33, enhanced the cyclic durability of the calcium-based sorbents.
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Evaluation on direct aqueous carbonation of industrial/mining solid wastes for CO2 mineralization
Zijian Li,Jie Chen,Zongze Lv,Yichao Tong,Jingyu Ran,Changlei Qin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
Carbonation of industrial alkaline resources can achieve dual effects of CO2 sequestration and solid wastemanagement, and the carbonated product may act as a potential cementitious backfill material. Based onthis idea, CO2 mineralization characteristics and potential of typical industrial solid wastes, mine tailingsand their mixtures are investigated by direct aqueous carbonation, and effects of reaction parameters,including particle size, reaction temperature, solid-to-liquid ratio, CO2 concentration, are systematicallyexplored. Results show that industrial solid wastes with a high Ca content such as carbide slag have bettercarbonation activity with the maximum CO2 sequestration capacity of 544.6 g-CO2/kg, while the carbonationof mine tailings is very weak. The combination of coal fly ash with tailings has a potentialstimulative effect during carbonation. Moreover, influences of carbonation parameters are revealed inthis study, and optimal reaction parameters are determined to be particle size below 75 lm, temperatureof 60 C, solid-to-liquid ratio of 100 g/L, and CO2 concentration of 15% within mild range. These resultscan provide fundamental knowledge for the integrated CO2 mineralization and goaf backfilling, andaccelerate carbon reduction and waste resource utilization.
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