型煤
焦炭
扩散
活化能
材料科学
化学反应
一氧化碳
动力学
碳纤维
扫描电子显微镜
化学工程
冶金
相(物质)
化学
煤
复合材料
催化作用
热力学
有机化学
复合数
物理
量子力学
工程类
作者
Ying Li,Jie Ren,Han Wei,Inam Ullah Khan,Mamdouh Omran,Timo Fabritius,Qifeng Shu,Chuan Wang,Yonggang Zang,Yaowei Yu
标识
DOI:10.1002/srin.202300057
摘要
The reduction kinetics of cold-bonded briquette prepared from return fines of sinter is studied. The results reveal that cold-bonded briquettes with coke (CBBC) have a higher reduction velocity index (RVI) value than cold-bonded briquettes without coke (CBB). Interfacial chemical reaction controls the early stages of the CBB reduction process at 900 and 950 °C, followed by both interfacial chemical reaction and internal diffusion. At 1000, 1050, and 1100 °C, the early and final stages of the CBB reduction process are controlled by interfacial chemical reaction and internal diffusion, respectively, while both interfacial chemical reaction and internal diffusion control middle stage. The apparent activation energies of the different stages are 46.20, 56.74, 38.24, and 40.74 kJ mol−1, respectively. The gasification of carbon reaction controls the reduction process of CBBC, and the apparent activation energy is 32.42 kJ mol−1. According to the Friedman method, the apparent activation energy of CBB and CBBC is reasonable. Coke promotes the phase transformation in CBBC. Scanning electron microscopy results show that the CBBC sample is more fully reduced than the CBB sample and that it has smoother corners and edges of the iron-bearing phase or the metallic iron phase than the CBB sample.
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