Effect of Cr<sub>2</sub>O<sub>3</sub> addition on the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets

Wei Li; Nan Wang; Gui-qin Fu; Man-sheng Chu; Miao-yong Zhu

doi:10.1007/s12613-018-1583-x

Volume 25 Issue 4

Apr. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(4): 391-398

Wei Li, Nan Wang, Gui-qin Fu, Man-sheng Chu, and Miao-yong Zhu, Effect of Cr₂O₃ addition on the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 391-398. https://doi.org/10.1007/s12613-018-1583-x

Cite this article as:

Wei Li, Nan Wang, Gui-qin Fu, Man-sheng Chu, and Miao-yong Zhu, Effect of Cr2O3 addition on the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 391-398. https://doi.org/10.1007/s12613-018-1583-x

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Research Article

Effect of Cr₂O₃ addition on the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets

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Corresponding author:
Miao-yong Zhu E-mail: myzhu@mail.neu.edu.cn
Received: 13 July 2017; Revised: 5 November 2017; Accepted: 23 November 2017

Abstract

Abstract

As part of a research project to develop a novel clean smelting process for the comprehensive utilization of Hongge vanadium titanomagnetite (HVTM), in this study, the effect of Cr₂O₃ addition on the oxidation induration mechanism of HVTM pellets (HVTMPs) was investigated in detail. The results showed that the compressive strength of the HVTMPs was greatly weakened by the Cr₂O₃ addition, mainly because of a substantial increase in the porosity of the HVTMPs. The Cr₂O₃ addition marginally affected the phase composition but greatly affected the microstructural changes of the HVTMPs. Increased amounts of Cr₂O₃ resulted in a decrease in the uniform distribution of the hematite grains and in an increase in the Fe-Cr solid solutions (Fe_1.2Cr_0.8O₃ and Fe_0.7Cr_1.3O₃) embedded in the hematite grains. Moreover, the compact hematite was destroyed by forming a dispersed structure and the hematite recrystallization was hindered during the oxidation induration, which adversely affected the compressive strength. On the basis of these results, a schematic was formulated to describe the oxidation induration mechanism with different amounts of added Cr₂O₃. This study provides theoretical and technical foundations for the effective production of HVTMPs and a reference for chromium-bearing minerals.
- chromium;
- Hongge vanadium titanomagnetite;
- porosity;
- oxidation induration;
- microstructure

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