钛对氢冶金竖炉球团粘结的影响：行为分析和机理演变

冯金格; 唐珏; 赵子川; 储满生; 郑艾军; 李晓兵; 王小艾

doi:10.1007/s12613-023-2730-6

Volume 31 Issue 2

Feb. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(2): 282-291

Jinge Feng, Jue Tang, Zichuan Zhao, Mansheng Chu, Aijun Zheng, Xiaobing Li, and Xiao’ai Wang, Effect of titanium on the sticking of pellets based on hydrogen metallurgy shaft furnace: Behavior analysis and mechanism evolution, Int. J. Miner. Metall. Mater., 31(2024), No. 2, pp. 282-291. https://doi.org/10.1007/s12613-023-2730-6

Cite this article as:

Jinge Feng, Jue Tang, Zichuan Zhao, Mansheng Chu, Aijun Zheng, Xiaobing Li, and Xiao’ai Wang, Effect of titanium on the sticking of pellets based on hydrogen metallurgy shaft furnace: Behavior analysis and mechanism evolution, Int. J. Miner. Metall. Mater., 31(2024), No. 2, pp. 282-291. https://doi.org/10.1007/s12613-023-2730-6

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研究论文

钛对氢冶金竖炉球团粘结的影响：行为分析和机理演变

1)
东北大学冶金学院, 沈阳 110819, 中国
2)
东北大学低碳炼钢前沿技术研究所, 沈阳 110819, 中国
3)
东北大学辽宁省低碳炼钢技术工程研究中心, 沈阳 110819, 中国
4)
教育部低碳炼钢前沿技术工程研究中心, 沈阳 110819, 中国
5)
河钢集团有限公司张宣科技, 石家庄 050000, 中国
6)
宣化钢铁集团有限公司, 石家庄 050000, 中国
7)
河钢集团有限公司钢铁研究院, 石家庄 050000, 中国

通讯作者:
唐珏 E-mail: tangj@smm.neu.edu.cn

文章亮点

(1) 在直接还原过程中，TiO₂可以有效地抑制球团的还原粘结行为，还原粘结指数随着TiO₂添加量的增加而降低。

(2) 低还原温度下球团的粘结行为主要取决于相邻球团界面处渣相的连接，并伴有较低的粘结强度，当还原温度升高，金属铁的互连成为导致球团粘结行为的主导因素。

(3) 与低还原温度相比，TiO₂在高还原温度下对球团的还原粘结行为影响较大。

中文摘要

摘要； 基于氢冶金的气基竖炉直接还原是高效低碳冶炼钒钛磁铁矿的一种很有前景的技术。然而，在该过程中，由于金属铁在相邻球团接触表面之间的聚集会发生球团的粘结行为，对气基竖炉的连续操作有严重的负面影响。作为钒钛磁铁矿综合利用新方法的基础工作的一部分，本研究旨在研究TiO₂对氢气气氛下不同还原条件的球团粘结行为和机理演变的影响。此外，通过微观形貌表征详细阐明了不同TiO₂添加量和还原温度的球团在还原过程中的粘附机理。研究结果表明，随着TiO₂添加量的增加，粘结指数呈线性下降。这种现象可归因于还原过程中未还原的FeTiO₃的增加，导致粘结界面处金属铁互连的强度降低。在1100°C时，当TiO₂的添加量从0wt%增加到15wt%，粘结指数从0.71%增加到59.91%。在低还原温度下，球团的粘结行为主要取决于相邻球团界面处渣相的连接，并伴有较低的粘结强度。当还原温度升高，金属铁的互连成为导致球团粘结行为的主导因素，粘结指数随还原温度的升高而急剧增加。与低还原温度相比，TiO₂在高还原温度下对球团的还原粘结行为影响较大。

关键词:

Research Article

Effect of titanium on the sticking of pellets based on hydrogen metallurgy shaft furnace: Behavior analysis and mechanism evolution

+ Author Affiliations

1)
School of Metallurgy, Northeastern University, Shenyang 110819, China
2)
Institute for Frontier Technologies of Low-carbon Steelmaking, Northeastern University, Shenyang 110819, China
3)
Liaoning Low-carbon Steelmaking Technology Engineering Research Center, Northeastern University, Shenyang 110819, China
4)
Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking (Ministry of Education), Shenyang 110819, China
5)
Zhang Xuan Technology of HBIS Group Co., Ltd., Shijiazhuang 050000, China
6)
Xuanhua Iron and Steel Group Co., Ltd., Shijiazhuang 050000, China
7)
Iron and Steel Research Institute of HBIS Group Co., Ltd., Shijiazhuang 050000, China

Mansheng Chu is an editorial board member for this journal and was not involved in the editorial review or the decision to publish this article. All authors declare that there are no competing interests.

Corresponding author:
Jue Tang E-mail: tangj@smm.neu.edu.cn
Received: 17 June 2023; Revised: 12 August 2023; Accepted: 16 August 2023; Available online: 18 August 2023

Abstract

Abstract

Direct reduction based on hydrogen metallurgical gas-based shaft furnace is a promising technology for the efficient and low-carbon smelting of vanadium–titanium magnetite. However, in this process, the sticking of pellets occurs due to the aggregation of metallic iron between the contact surfaces of adjacent pellets and has a serious negative effect on the continuous operation. This paper presents a detailed experimental study of the effect of TiO₂ on the sticking behavior of pellets during direct reduction under different conditions. Results showed that the sticking index (SI) decreased linearly with the increasing TiO₂ addition. This phenomenon can be attributed to the increase in unreduced FeTiO₃ during reduction, leading to a decrease in the number and strength of metallic iron interconnections at the sticking interface. When the TiO₂ addition amount was raised from 0 to 15wt% at 1100°C, the SI also increased from 0.71% to 59.91%. The connection of the slag phase could be attributed to the sticking at a low reduction temperature, corresponding to the low sticking strength. Moreover, the interconnection of metallic iron became the dominant factor, and the SI increased sharply with the increase in reduction temperature. TiO₂ had a greater effect on SI at a high reduction temperature than at a low reduction temperature.
- titanium;
- sticking index;
- hydrogen metallurgy;
- direct reduction;
- pellets

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