Effect of diboron trioxide on the crushing strength and smelting mechanism of high-chromium vanadium-titanium magnetite pellets

Gong-jin Cheng; Zi-xian Gao; He Yang; Xiang-xin Xue

doi:10.1007/s12613-017-1515-1

Volume 24 Issue 11

Nov. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(11): 1228-1240

Gong-jin Cheng, Zi-xian Gao, He Yang, and Xiang-xin Xue, Effect of diboron trioxide on the crushing strength and smelting mechanism of high-chromium vanadium-titanium magnetite pellets, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1228-1240. https://doi.org/10.1007/s12613-017-1515-1

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Gong-jin Cheng, Zi-xian Gao, He Yang, and Xiang-xin Xue, Effect of diboron trioxide on the crushing strength and smelting mechanism of high-chromium vanadium-titanium magnetite pellets, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1228-1240. https://doi.org/10.1007/s12613-017-1515-1

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Research Article

Effect of diboron trioxide on the crushing strength and smelting mechanism of high-chromium vanadium-titanium magnetite pellets

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Corresponding author:
Xiang-xin Xue E-mail: xuexx@mail.neu.edu.cn
Received: 16 March 2017; Revised: 16 June 2017; Accepted: 19 June 2017

Abstract

Abstract

The effect of diboron trioxide (B₂O₃) on the crushing strength and smelting mechanism of high-chromium vanadium-titanium magnetite pellets was investigated in this work. The main characterization methods were X-ray fluorescence, inductively coupled plasma-atomic emission spectroscopy, mercury injection porosimetry, X-ray diffraction, metallographic microscopy, and scanning electron microscopy-energy-dispersive X-ray spectroscopy. The results showed that the crushing strength increased greatly with increasing B₂O₃ content and that the increase in crushing strength was strongly correlated with a decrease in porosity, the formation of liquid phases, and the growth and recrystallization consolidation of hematite crystalline grains. The smelting properties were measured under simulated blast furnace conditions; the results showed that the smelting properties within a certain B₂O₃ content range were improved and optimized except in the softening stage. The valuable element B was easily transformed to the slag, and this phenomenon became increasingly evident with increasing B₂O₃ content. The formation of Ti(C,N) was mostly avoided, and the slag and melted iron were separated well during smelting with the addition of B₂O₃. The size increase of the melted iron was consistent with the gradual optimization of the dripping characteristics with increasing B₂O₃ content.
- high-chromium vanadium-titanium magnetite;
- pellets;
- diboron trioxide;
- crushing strength;
- smelting mechanism

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References

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