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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摘要铁矿石烧结工艺是钢铁流程不可或缺的环节,铁酸钙作为烧结矿中最主要的黏结相,对烧结工艺及烧结矿冶金性能具有重要影响。综述了铁矿石烧结工艺中铁酸钙黏结相及其复合体系的化学组成、形成机理、还原机理和脉石成分对其影响等方面的研究进展。铁酸钙的化学组成取决于烧结矿中的Fe、Ca、Si、Al等元素的含量,复合铁酸钙(SFCA)可用通式xFe₂O₃·ySiO₂·zAl₂O₃·5CaO表示,且满足x+y+z=12;铁酸钙的生成机理受脉石成分之间的化学反应、不同温度和气氛条件下相变过程的影响,对生成机理的研究对于控制烧结矿中黏结相含量具有关键作用;铁酸钙的还原路径受黏结相组成、还原温度、气氛组成等影响,四元复合铁酸钙的还原路径暂时缺乏研究,还原机理的研究对于提高铁矿石冶炼效率和降低能耗具有重要意义;脉石材料是影响铁酸钙形成和还原的重要因素,SiO₂、Al₂O₃、MgO等可改变铁酸钙的晶体结构及其生成和还原机理。最后,基于当前铁酸钙黏结相的研究现状,对未来关于铁酸钙黏结相的研究方向进行了展望,主要包括探索烧结过程中有价组元的有效提取、综合利用及获得铁酸钙领域具有普适性的物化数据等,这些工作的实施有助于进一步完善铁矿石烧结理论。

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	沈峰满
	安海玮
	姜鑫
	倪静峰
	郑海燕
	高强健

关键词 ：炼铁, 烧结矿, 黏结相, 复合铁酸钙, 研究进展

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

收稿日期: 2023-06-25

引用本文:

沈峰满, 安海玮, 姜鑫, 倪静峰, 郑海燕, 高强健. 烧结工艺中复合铁酸钙黏结相的研究进展[J]. 钢铁, 2024, 59(2): 1-12. SHEN Fengman, AN Haiwei, JIANG Xin, NI Jingfeng, ZHENG Haiyan, GAO Qiangjian. 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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