Effect of w(Al2O3)/w(SiO2) on sintered ore mineralization characteristics and metallurgical properties
YANG Tao1,2, LONG Hong-ming1,2, DING Cheng-yi1,2, LI Yong3, CAO Fa-wei3, HU Ming-yi3
1. Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling, Anhui University of Technology, Ma'anshan 243002, Anhui, China; 2. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243002, Anhui, China; 3. Technology Research and Development Center, Lu'an Iron and Steel Holding Group Co., Ltd., Lu'an 237400, Anhui, China
Abstract:Al2O3 and SiO2 are important components of composite calcium ferrite, and an appropriate ratio of alumina to silica is an important condition for obtaining good sintering ore-forming characteristics and metallurgical properties. Based on the on-site sintering raw material structure of a steel plant, the FactSage theory was used to calculate the change law of equilibrium phase composition and liquid phase composition for the sintering system. As the ratio of alumina to silica decreased from 0.41 to 0.34, the high-quality phases such as liquid phase and iron oxide in the sinter increased, the content of inferior phases such as spinel decreased, and the liquid phase precipitates and SFCA gradually increased. The experiment revealed the influence of different ratio for alumina to silica on the quality, phase composition, microstructure and metallurgical properties of sinters. The results showed that as the ratio of alumina to silica decreased from 0.41 to 0.34, the drum strength, yield and utilization factor of sinters improved significantly, from 58.27%, 60.24%, 1.585 t/(m2·h) to 61.73%, 71.87%, and 2.185 t/(m2·h), respectively. The mineral phase analysis shows that as the ratio of alumina to silica decreases, the content of calcium ferrite increases and gradually develops into acicular shape, while the content of hematite, magnetite and pores decreases, and the optimal phase composition is reached when the ratio of alumina to silica is 0.34. This result corroborates the change rule of sintered ore quality index. When the ratio of alumina to silica is 0.34, the metallurgical performance of sinter is improved compared with the benchmark sinter. The reduction degree and reduction degradation property index RDI>3.15 mm are increased from 73.11% and 72% to 77.47% and 80% respectively, the softening temperature range and the droplet temperature range are narrowed, the total characteristic value S of the droplet performance also has a downward trend, and the soft melting property of sinter is improved significantly. According to the theoretical calculation and test results, the optimization of ore blending is of great significance for improving the quality of sintered minerals and optimizing sintering process.
杨涛, 龙红明, 丁成义, 李勇, 曹发卫, 胡明意. 铝硅比对烧结成矿特性及冶金性能的影响[J]. 钢铁, 2022, 57(4): 43-51.
YANG Tao, LONG Hong-ming, DING Cheng-yi, LI Yong, CAO Fa-wei, HU Ming-yi. Effect of w(Al2O3)/w(SiO2) on sintered ore mineralization characteristics and metallurgical properties[J]. Iron and Steel, 2022, 57(4): 43-51.
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