烧结工艺中复合铁酸钙黏结相的研究进展

doi:10.13228/j.boyuan.issn0449-749x.20230348

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Abstract The sintering process of iron ore is an essential part of the steelmaking process. Calcium ferrite, as the main bonding phase in sinter, significantly influences the sintering process and metallurgical properties of sinter. The research progress on the chemical composition, formation mechanism, reduction mechanism, and influence of gangue components of calcium ferrite and its complex system in the iron ore sintering process are reviewed. In summary, the chemical composition of calcium ferrite is determined by the concentrations of Fe, Ca, Si, Al, and other elements present in the sinter. The sillico-ferrite of calcium and aluminum (SFCA) can be expressed by the general formula xFe₂O₃·ySiO₂·zAl₂O₃·5CaO, where x + y + z = 12; The formation mechanism of calcium ferrite is influenced by chemical reactions among gangue components and phase transformation processes under varying temperature and atmosphere conditions. Understanding the formation mechanism is crucial for effectively controlling the content of the bonding phase in the sinter; The reduction pathway of calcium ferrite is affected by the composition of the bonding phase, reduction temperature, and atmosphere. However, research on the reduction pathway of quaternary composite calcium ferrite is currently lacking. Studying the reduction mechanism is significant for improving the efficiency of iron ore smelting and reducing energy consumption; Gangue materials play a crucial role in the forming and reducing calcium ferrite. Elements such as SiO₂, Al₂O₃, and MgO can alter the crystal structure of calcium ferrite and its formation and reduction mechanisms. Finally, based on the current research status of the calcium ferrite bonding phase, future research directions are proposed. These include exploring effective extraction and comprehensive utilization of valuable components during sintering, obtaining universal physicochemical data in calcium ferrite, and investigating related areas. These efforts will contribute to further advancing the theory of iron ore sintering.

Key words： ironmaking sinter bonding phase sillico-ferrite of calcium and aluminum (SFCA) research progress

Received: 25 June 2023

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	SHEN Fengman
	AN Haiwei
	JIANG Xin
	NI Jingfeng
	ZHENG Haiyan
	GAO Qiangjian

Cite this article:

SHEN Fengman,AN Haiwei,JIANG Xin等. Research progress on sillico-ferrite of calcium and aluminum (SFCA) bonding phase in sintering process[J]. Iron and Steel, 2024, 59(2): 1-12.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230348 OR http://www.chinamet.cn/Jweb_gt/EN/Y2024/V59/I2/1

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