Reduction disintegration behavior and crystallographic transformation of vanadium-titanium magnetite pellets during hydrogen-based reduction

被引:3
作者
Chen, Feng [1 ]
Li, Hao [1 ]
Guo, Yufeng [1 ]
Liu, Kuo [1 ,3 ]
Wang, Shuai [1 ,2 ]
Yang, Lingzhi [1 ]
Wen, Yuekai [1 ]
Zhang, Meng [1 ]
机构
[1] Cent South Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China
[2] Key Lab Vanadium & Titanium Resources Comprehens U, Panzhihua 617000, Sichuan, Peoples R China
[3] Sino Platinum Met Co LTD, Kunming 650156, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2025年 / 34卷
基金
中国国家自然科学基金;
关键词
Hydrogen-based reduction; Phase transformation; Crystallographic transformation; Vanadium-titanium magnetite pellets; SWELLING BEHAVIOR; TITANOMAGNETITE CONCENTRATE; MELTING PROPERTIES; IRON; ORE; MECHANISM; RECOVERY; CHROMIUM; SLAG; GAS;
D O I
10.1016/j.jmrt.2024.12.021
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
There are many advantages of the smelting of vanadium-titanium magnetite pellets by hydrogen-based shaft furnace pre-reduction and electric arc furnace process, including high reduction efficiency, low carbon dioxide emission and high recovery of titanium and so on. The preparation of qualified vanadium-titanium magnetite pellets with low reduction disintegration index (RDI) is prerequisite of this process. The reduction disintegration behavior of vanadium-titanium magnetite pellets during hydrogen-based reduction was systematically investigated in this work, and the crystallographic transformations during the reduction were dug into as well. The RDI+6.3 mm of vanadium-titanium magnetite pellets reached 43.28% after 60 min of reduction at 500 degrees C in a Midrex atmosphere (36% CO, 5% CO2, 55% H2, and 4% CH4). During the reduction of trigonal titano-hematite [(Fe,Ti)2O3] to cubic titano-magnetite, both the single unit cell volume and the total number of unit cells increased dramatically. The total titanium-iron oxide cell volume expanded nearly sevenfold, from 8.75 x 1022 & Aring;3 to 5.99 x 1023 & Aring;3, causing considerable pellet swelling. Conversely, the reduction of rhombohedral Fe2TiO5 to trigonal FeTiO3 resulted in a decrease in cell volume. Studying the crystalline transformation is crucial for developing effective methods to inhibit low-temperature reduction disintegration, thereby enhancing the comprehensive utilization of vanadium-titanium magnetite resources.
引用
收藏
页码:152 / 163
页数:12
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