Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 19, Issue -, Pages 243-262Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2022.04.146
Keywords
Fired pellets of VTM; Coal-based direct reduction; Metallization degree; Reduction swelling; Compressive strength
Funding
- National Natural Science Foundation of China [52174329]
- Youth Natural ence Foundation of China [51904347]
- Funda-mental Research Funds for the Central Universities of Central South University [2021zzts0292]
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This study investigates the reduction behaviors of fired vanadium titanomagnetite (VTM) pellets in the coal-based rotary kiln direct reduction-electric furnace smelting process. The results show that the reduction conditions have significant effects on the reduction behaviors of the VTM pellets. The TiO2 content, mineral composition, and microstructure of the pellets play important roles in their reduction behaviors.
The reduction behaviors of fired vanadium titanomagnetite (VTM) pellets must be fully ascertained for the effective utilization of VTM concentrates via the coal-based rotary kiln direct reduction-electric furnace smelting process. This paper investigates the effects of the reduction conditions on the reduction behaviors of three types of fired VTM pellets, i. e., Pellets 1, 2 and 3 assaying 13.02%, 11.70% and 5.25% TiO2, respectively, as well as the differences among their reduction behaviors. The results indicate that the highest metallization degree of Pellets 1, 2 and 3 increases sequentially when fully reduced at high temperature for long duration. Pellet 1 shows a good resistance to volume swelling under any reduction conditions, while both Pellets 2 and 3 exhibit the abnormal volume swelling during reduction, with the maximum volume swelling up to 43.78% and 36.45%, respectively. The compressive strength of reduced pellets of Pellet 1 is about 1000N/pellet, whereas below or only close to 500N/pellet for Pellets 2 and 3. Mechanism analysis shows that the minerals compositions and microstructure of fired VTM pellets have great effect on their reduction behaviors. Moreover, the reduction behaviors of fired VTM pellets can be improved by addition of ordinary magnetite in the pellet feeds. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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