Al2O3质量分数对高碱度烧结矿软熔滴落性能影响

王喆; 张建良; 左海滨; 高冰; 李峰光; 王润博

doi:10.13228/j.boyuan.issn0449-749x.20140562

钢铁 ›› 2015, Vol. 50 ›› Issue (7) : 20-25. DOI: 10.13228/j.boyuan.issn0449-749x.20140562

冶金工艺技术

Al2O3质量分数对高碱度烧结矿软熔滴落性能影响

王喆，张建良，左海滨，高冰，李峰光，王润博

作者信息 +

Influence of Al2O3 content on softening-melting property of high basicity sinter

王喆，张建良，左海滨，高冰，李峰光，王润博

Author information +

文章历史 +

摘要

对Al2O3质量分数不同的高碱度烧结矿进行了荷重软化熔滴试验，并通过对不同温度下烧结矿微观结构和矿物组成的分析，进行了Al2O3质量分数对烧结矿软熔滴落性能影响机制的探讨。试验结果表明：Al2O3质量分数增加促进了还原过程中钙铝黄长石(2CaO·Al2O3·SiO2)和浮士体共晶相(2CaO·SiO2-2CaO·Al2O3·SiO2-FeO)等低熔点富铝相的生成，导致高Al2O3烧结矿在较低温度下出现开气孔孔隙封闭，从而降低了压差陡升温度。在熔融滴落阶段，高Al2O3烧结矿中渣相的Al2O3质量分数较高。存在于金属铁颗粒之间渣相的液相线和黏度随Al2O3质量分数增加而提高，在一定程度上降低金属铁颗粒的聚合，使得烧结矿的滴落温度提高。同时，高Al2O3烧结矿具有较宽的熔滴区间，使得熔融滴落区间的透气性较差。

Abstract

Softening and melting tests under load of sinter with varying Al2O3 content were carried out. In addition， microstructure and mineral composition of sinter at different temperatures were also analyzed and the mechanism that the effect of Al2O3 content on sinter softening and melting property was elucidated. Results showed that the increase of Al2O3 content in sinter favored the formation of Al2O3-rich slag phase with lower melting point， such as gehlenite (2CaO·Al2O3·SiO2) and the eutectic (2CaO·SiO2-2CaO·Al2O3·SiO2-FeO)， resulting in the blockage of open pore. During melting-dripping process， slag phase of high Al2O3 sinter had a relative higher Al2O3 content. With the increase of Al2O3 content， the liquidus temperature and viscosity of slag phase existing between metallic iron particles was deteriorated. It decreased the concentration of metallic iron and then increased the dripping temperature. Meanwhile， high Al2O3 content sinter was associated with a thicker melting-dripping zone， leading to the deterioration of sinter bed permeability.

图表

引用本文

EndNote

Ris (Procite)

Bibtex

导出引用

王喆, 张建良, 左海滨, 等. Al2O3质量分数对高碱度烧结矿软熔滴落性能影响[J]. 钢铁, 2015, 50(7): 20-25 https://doi.org/10.13228/j.boyuan.issn0449-749x.20140562

YU Zhe, ZHANG Jian-Liang, ZUO Hai-Bin, et al. Influence of Al2O3 content on softening-melting property of high basicity sinter[J]. Iron and Steel, 2015, 50(7): 20-25 https://doi.org/10.13228/j.boyuan.issn0449-749x.20140562

中图分类号： 中图分类号：TF046

参考文献

[1] 沙永志. 中国炼铁工业的发展前景及面临的挑战[J]. 2014年全国炼铁生产技术会暨炼铁学术年会文集 (上)，2014, 40-48．
[2] 沈峰满, 郑海燕, 姜鑫, 等. 高炉炼铁工艺中Al2O3的影响及适宜w(MgO)/w(Al2O3)的探讨[J]. 钢铁, 2014, 49(1):1-6.
[3] 李肇毅, 郁庆瑶. 适应高Al2O3炉渣冶炼的高炉炉渣结构调整[J]. 宝钢技术, 2012(3):1-4.
[4] Umadevi T, Sah R, Mahapatra P C. Influence of sinter basicity (CaO/SiO2) on low and high alumina iron ore sinter quality[J]. Mineral Processing and Extractive Metallurgy. 2014,123(2),75-85.
[5] Lu L, Holmes R J, Manuel J R. Effects of Alumina on Sintering Performance of Hematite Iron Ores[J]. ISIJ international, 2007, 47(3):349-358.
[6] 王莜留. 钢铁冶金学: 炼铁部分[M]. 北京: 冶金工业出版社, 2008.
[7] 沐继尧. 高碱度烧结矿的软熔性能[J]. 烧结球团, 1986, 11(6):17-23.
[8] Nishimura T, Higuchi K, Naito M, et al. Evaluation of Softening, Shrinking and Melting Reduction Behavior of Raw Materials for Blast Furnace[J]. ISIJ international, 2011, 51(8):1316-1321.
[9] Shigaki I, Shirouchi S, Tokutake K, et al. Study and Improvement of Reduction Retardation and Melt-down Properties of Pellets.[J]. ISIJ International, 1990, 30(3): 199-207.
[10] Higuchi K, Naito M, Nakano M, et al. Optimization of Chemical Composition and Microstructure of Iron Ore Sinter for Low-temperature Drip of Molten Iron with High Permeability[J]. ISIJ international, 2004, 44(12): 2057-2066.
[11] Preprint of General Meeting of American Iron and Steel Institute [Z]. 23.
[12] Shigaki I, Sawada M, Maekawa M, et al. Melting Property of MgO Containing Sinter[J]. Transactions of the Iron and Steel Institute of Japan, 1981, 21(12): 862-869.
[13] 程向明, 毕学工, 史世庄, 等. 铁焦与铁矿石混装对高炉初渣形成的影响[J]．钢铁，2014，49(8)：9-14．
[14] Hino M, Nagasaka T, Katsumata A, et al. Simulation of Primary-Slag Melting Behavior in the Cohesive Zone of a Blast furnace, Considering the Effect of Al2O3, FetO, and Basicity in the sinter ore[J]. Metallurgical and Materials Transactions B, 1999, 30(4): 671-683.