Influence of gangue existing states in iron ores on the formation and flow of liquid phase during sintering

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2014-10, Vol.21 (10), p.962-968
• Main Authors: Zhang, Guo-liang, Wu, Sheng-li, Chen, Shao-guo, Su, Bo, Que, Zhi-gang, Hou, Chao-gang
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Assimilation; Bayer process; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion and Coatings; Formations; Gangue; Gibbsite; Glass; High temperature; Iron compounds; Iron ores; Kaolin; Liquid phases; Materials Science; Metallic Materials; Natural Materials; Quartz; Silicon dioxide; Sintering; Surfaces and Interfaces; Thin Films; Tribology; Viscosity; 二氧化硅含量; 扫描电子显微镜; 流动; 液相; 烧结过程; 煤矸石; 状态; 铁矿石
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-014-0996-4

Gangue existing states largely affect the high-temperature characteristics of iron ores. Using a micro-sintering method and scan- ning electron microscopy, the effects of gangue content, gangue type, and gangue size on the assimilation characteristics and fluidity of liquid phase of five different iron ores were analyzed in this study. Next, the mechanism based on the reaction between gangues and sintering mate- dais was unraveled. The results show that, as the SiO2 levels increase in the iron ores, the lowest assimilation temperature （LAT） decreases, whereas the index of fluidity of liquid phase （IFL） increases. Below 1.5wt%, Al2O3 benefits the assimilation reaction, but higher concentra- tions proved detrimental. Larger quartz particles increase the SiO2 levels at the local reaction interface between the iron ore and CaO, thereby reducing the LAT. Quartz-gibbsite is more conductive to assimilation than kaolin. Quartz-gibbsite and kaolin gangues encourage the forma- tion of liquid-phase low-Al2O3-SFCA with high IFL and high-Al2O3-SFCA with low IFL, respectively.