高炉炼铁工艺中超高TiO<sub>2</sub>炉渣：密度和表面张力

庞正德; 蒋宇阳; 凌家伟; 吕学伟; 严志明

doi:10.1007/s12613-021-2262-x

Volume 29 Issue 6

Jun. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(6): 1170-1178

Zhengde Pang, Yuyang Jiang, Jiawei Ling, Xuewei Lü, and Zhiming Yan, Blast furnace ironmaking process with super high TiO₂ in the slag: Density and surface tension of the slag, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1170-1178. https://doi.org/10.1007/s12613-021-2262-x

Cite this article as:

Zhengde Pang, Yuyang Jiang, Jiawei Ling, Xuewei Lü, and Zhiming Yan, Blast furnace ironmaking process with super high TiO2 in the slag: Density and surface tension of the slag, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1170-1178. https://doi.org/10.1007/s12613-021-2262-x

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研究论文

高炉炼铁工艺中超高TiO₂炉渣：密度和表面张力

1)
钒钛冶金与新材料重庆市重点实验室，重庆 400044，中国
2)
重庆大学材料科学与工程学院，重庆 400044，中国
3)
WMG, University of Warwick, Coventry, CV4 7AL, UK

通讯作者:
吕学伟 E-mail: lvxuewei@cqu.edu.cn

严志明 E-mail: zhiming.yan@warwick.ac.uk

文章亮点

(1) 系统地研究了TiO₂含量和MgO/CaO质量比对高钛型炉渣密度和表面张力的影响规律。

(2) 基于炉渣结构聚合度阐明了炉渣宏观性质与其微观结构特征之间的联系。

(3) 总结炉渣表面张力理论预测模型并获得含钛高炉渣等表面张力图。

中文摘要

针对高炉冶炼超高（>80%）甚至全钒钛磁铁矿工艺流程，为了优化高炉造渣制度，进行了一系列关于高钛型炉渣（BFS）物理化学性质方面的研究。本工作分别利用阿基米德原理和最大气泡压力法研究了高钛型炉渣的密度和表面张力。系统探究了TiO₂含量和MgO/CaO质量比对CaO–SiO₂–TiO₂–MgO–Al₂O₃炉渣密度和表面张力的影响规律。结果发现，随着TiO₂含量从20wt%增加到30wt%，炉渣密度逐渐降低，但随着MgO/CaO质量比从0.32增加到0.73，熔渣密度略有增加。从硅酸盐网络结构角度来看，炉渣密度与结构聚合度（DOP）具有一致的变化规律。TiO₂的加入会降低炉渣体系中(Q³)²/(Q²)比值（其中，Q²和Q³分别代表桥氧数为2和3的网络结构单元），进而降低炉渣结构聚合度，导致炉渣密度降低。随着TiO₂含量从20wt%增加到30wt%，CaO–SiO₂–TiO₂–MgO–Al₂O₃炉渣的表面张力显著降低。相反，随着MgO/CaO质量比从0.32增加到0.73，表面张力增加。此外，利用基于Butler公式的Tanaka模型获得了1723 K下含钛炉渣等表面张力图，为高炉冶炼超高比例（>80%）甚至全钒钛磁铁矿工艺中造渣制度的优化提供了数据支撑。

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Research Article

Blast furnace ironmaking process with super high TiO₂ in the slag: Density and surface tension of the slag

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Abstract

Abstract

Aiming at the process of smelting ultra-high (>80%) or even full vanadium titanomagnetite in blast furnace, we are conducting a series of works on physics character of high TiO₂ bearing blast furnace slag (BFS) for slag optimization. This work discussed the density and surface tension of high TiO₂ bearing BFS using the Archimedean principle and the maximum bubble pressure method, respectively. The influence of TiO₂ content and the MgO/CaO mass ratio on the density and surface tension of CaO–SiO₂–TiO₂–MgO–Al₂O₃ slags were investigated. Results indicated that the density of slags decreased with the TiO₂ content increasing from 20wt% to 30wt%, but it increased slightly with the MgO/CaO mass ratio increasing from 0.32 to 0.73. In view of silicate network structure, the density and the degree of polymerization (DOP) of network structure have a consistent trend. The addition of TiO₂ reduced (Q³)²/(Q²) ratio (Q² and Q³ represent structural unit with bridge oxygen number of 2 and 3, respectively) and then decreased DOP, which led to the decrease of slag density. The surface tension of CaO–SiO₂–TiO₂–MgO–Al₂O₃ slags decreased dramatically with the TiO₂ content increasing from 20wt% to 30wt%. Conversely, it increased with the MgO/CaO mass ratio increasing from 0.32 to 0.73. Furthermore, the iso-surface tension lines were obtained under 1723 K using the Tanaka developed model in view of Butler formula. It may be useful for slag optimization of ultra-high proportion (>80%) or even full vanadium titanomagnetite under BF smelting.
- vanadium titanomagnetite;
- density;
- surface tension;
- iso-surface tension lines

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高炉炼铁工艺中超高TiO₂炉渣：密度和表面张力

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Blast furnace ironmaking process with super high TiO₂ in the slag: Density and surface tension of the slag

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高炉炼铁工艺中超高TiO2炉渣：密度和表面张力

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中文摘要

Blast furnace ironmaking process with super high TiO2 in the slag: Density and surface tension of the slag

Abstract

References

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高炉炼铁工艺中超高TiO₂炉渣：密度和表面张力

Blast furnace ironmaking process with super high TiO₂ in the slag: Density and surface tension of the slag