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Your search keyword '"Zhang, An-Liang"' showing total 177 results
Start Over Author "Zhang, An-Liang" Journal journal of iron and steel research international
177 results on '"Zhang, An-Liang"'

28. Interface interaction between SiO2and magnetite under high temperature: particle migration and inhibition mechanism

Author

Wang, Yao-zu, Zhang, Jian-liang, Cheng, Qiang, Jiang, Hui-qing, Liu, Zheng-jian, and Tan, Yu-bo

Abstract

Silicon is one of the main gangue components in iron ore, usually in the form of quartz and olivine. Numerous studies have shown that SiO2has a two-sided effect on the consolidation of pellets during high-temperature oxidation roasting of magnetite. However, it is very difficult to capture the structural evolution and migration mechanisms during high-temperature roasting process by existing experimental methods. Therefore, the influence of SiO2on the consolidation behavior of magnetite was studied through a series of roasting experiments and molecular dynamic simulation. The results show that the consolidation index and particle growth index decrease with the increase in SiO2content in the particles. At 1573 K, the liquid phase promotes the recrystallization growth of hematite at high temperature. Molecular dynamic study shows that it is difficult for quartz SiO2to form sintering neck with Fe2O3. When the calcination temperature is higher than 1400 K, the Fe2O3–Fe2SiO4system produces a considerable sintering neck structure after relaxation. The atomic migration ability of Fe2SiO4is much higher than that of Fe2O3. The higher atomic migration ability of Fe2SiO4is the main reason for the formation of the sintering neck.

Published
2024
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42. O2adsorption on Fe3O4(110) surface and effect of gangue element Al doping: combined study of binding experiment and ab initio molecular dynamics

Author

Liu, Zheng-jian, Jiang, Hui-qing, Wang, Yao-zu, Zhang, Jian-liang, Qiao, Hong-mei, Zheng, An-yang, and Guo, Fang-yu

Abstract

Abstract: At high temperature, the chemical reaction mechanism at the interface of magnetite and the influence mechanism of gangue element Al on the oxidation performance of magnetite are not clear. In addition, due to the limitation of existing experimental equipment, it is difficult to clarify the interface reaction mechanism in the oxidation process and the influence mechanism of Al on the surface oxidation reaction of Fe3O4at an atomic scale at high temperature. The surface oxidation reaction mechanism of magnetite and the influence mechanism of Al on the oxidation of magnetite were studied by experiments and AIMD (ab initio molecular dynamics). The experimental results show that the existence of Al2O3will reduce the initial oxidation temperature and comprehensive oxidation performance of magnetite. The AIMD results show that aluminum can accelerate the interface reaction rate of Fe3O4in the high-temperature oxidation atmosphere, but the strong Al–O binding ability is not conducive to the transfer of O atoms in the oxidation process.

Published
2024
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