|
|
|
| Softening–melting–dripping characteristics and evolution mechanism of vanadium-bearing titanomagnetite carbon composite briquette used as novel blast furnace burden |
| Wei Zhao1, Man-sheng Chu2, Hong-wei Guo1, Zheng-gen Liu2, Bing-ji Yan1 |
1 School of Iron and Steel, Soochow University, Suzhou 215137, Jiangsu, China;
2 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China |
|
|
|
|
Abstract Vanadium-bearing titanomagnetite carbon composite briquette (VTM-CCB) was proposed as an innovative and promising blast furnace burden to realize low-carbon and high-efficiency ironmaking. To optimize the compositions of VTM-CCB based on its softening–melting–dripping characteristics, the evolution behavior and mechanisms of VTM-CCB in cohesive zone and dripping zone were investigated by conducting softening–melting tests under blast furnace conditions. The results show that the structure evolution of VTM-CCB in softening–melting process is correlated to the molten slag, metallic iron, liquid iron, and residual carbon. With the molar ratio of the fixed carbon to the reducible oxygen in iron oxides (FC/O ratio) ranging from 0.8 to 1.0, the VTM-CCB tends to form dense structure and accelerate the softening and melting. With increasing the FC/O ratio to 1.2 and 1.4, the VTM-CCB tends to form concentric circular structure, which could suppress the collapse of packed bed, shift down the location of core cohesive zone, and improve the gas permeability. Although the appropriate increase in FC/O ratio could improve the softening–melting performance of VTM-CCB, a higher FC/O ratio could also promote the precipitation of Ti(C,N), thereby thickening the molten mixtures and deteriorating the dripping behavior. Fully considering the softening–melting–dripping characteristics and permeability, the appropriate FC/O ratio of VTM-CCB should be controlled in the range of 1.0–1.2.
|
|
|
|
|
|
| Cite this article: |
|
Wei Zhao,Man-sheng Chu,Hong-wei Guo, et al. Softening–melting–dripping characteristics and evolution mechanism of vanadium-bearing titanomagnetite carbon composite briquette used as novel blast furnace burden[J]. Journal of Iron and Steel Research International, 2021, 28(9): 1082-1094.
|
|
|
|
| [1] |
Lei Zhang, Jian-liang Zhang, Xiang-yu Hu, Zheng-jian Liu, Heng-bao Ma, Ke-xin Jiao. Behavior of liquid passing through deadman: influence of slag/iron ratio and unburned pulverized coal[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2021, 28(9): 1095-1104. |
| [2] |
Yun-hua Zhou, Ping Zhou, Jia-yun Dan, Hong-jie Yan, Dong-ling Wu. Effects of single lance configuration on coal combustion process in tuyere from viewpoint of coal plume[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2021, 28(7): 785-798. |
| [3] |
Peng Han, Wen-long Zhan, Hao-bin Zhu, Lei Gao, Ying-chang Yu, Zhi-jun He, Jun-hong Zhang, Qing-hai Pang. Thermal analysis and kinetic modeling of pulverized coal combustion accompanied with coke breeze[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2021, 28(7): 809-817. |
| [4] |
Ri-jin Cheng, Hua Zhang, Yang Li, Qing Fang, Bao Wang, Hong-wei Ni. Effect of process parameters on dry centrifugal granulation of molten slag by a rotary disk atomizer[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2021, 28(03): 263-271. |
| [5] |
Yong Deng, Jian‑liang Zhang, Ran Liu, Ke‑xin Jiao, Bing‑ji Yan. Smelting practice of scrap addition in blast furnace and theoretical analysis of cost saving[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(9): 1005-1010. |
| [6] |
Xin Jiang, Huai‑yu Zhang, Hai‑yan Zheng, Qiang‑jian Gao, Feng‑man Shen. Three-segment control theory of MgO/Al2O3 ratio based on viscosity experiments and phase diagram analyses at 1500 °C[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(6): 624-630. |
|
|
|
|
2021, Vol. 28 
