碳化作用
水溶液
材料科学
微尺度化学
碳化物
化学工程
动力学
熔渣(焊接)
城市固体废物
传质
废物管理
热力学
化学
冶金
色谱法
复合材料
数学
有机化学
工程类
数学教育
物理
量子力学
作者
Zijian Li,Jie Chen,Yong Cheng,Jingyu Ran,Changlei Qin
标识
DOI:10.1016/j.jece.2023.111358
摘要
CO2 mineralization combined with goaf backfilling is an effective pathway for alkaline solid waste recycling and CO2 emission reduction. Determining the kinetics of solid waste mixtures during direct aqueous carbonation is therefore important. Here, carbonation behavior and kinetics of carbide slag and its mixes with iron tailing are examined using a kinetic model based on the two-film theory. The impact of important operation parameters is assessed through model fitting as well. Results show that there is an excellent fitting accuracy to the carbonation of carbide slag and its 50 % mixtures by the model (average R2 =0.999) although a limitation is observed when the IT blending ratio is very high. Additionally, the change of gas-liquid mass transfer flux is compatible with the theory, and the ideal parameters are determined to be a reaction temperature of 65 °C, a solid-liquid ratio of 100 g/L, and a CO2 concentration of 15 %. Difference between the experimental and predicted value is controlled within 10 %. The above results are beneficial to revealing the microscale carbonation mechanism of mixed solid waste and may offer theoretical backing for industrial applications.
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