Abstract
High-chromium vanadium and titanium magnetite (HCVTM) sinter has poor properties. The coke ratio has an important effect on the behavior of HCVTM sintering as it affects the mineral phases in the high-chromium vanadium and titanium sinter (HCVTS) via changing the sintering temperature and atmosphere. In this work, the sintering behavior of HCVTM mixed with varying coke ratios was investigated through sintering pot tests, X-ray diffraction (XRD), gas chromatographic analysis, and mineral phase analysis. The results show that, with the increase of the coke ratio from 4.0% to 6.0%, leading to the increase of the combustion ratio of the flue gas, the vertical sintering rate and sinter productivity decrease. Meanwhile, with the change of the coke ratio, the content of magnetite, silicate, and perovskite increase, while the hematite and calcium ferrite decrease. In addition, the tumble strength and reduction ability of HCVTS decrease, and its degradation strength increase. It was found that the appropriate coke ratio for the sintering process was 5.0 wt %.
Highlights
The reserve of vanadium and titanium magnetite (VTM) is estimated at over 40 billion tons worldwide
It is mentioned that blast furnace smelting of High-chromium vanadium and titanium magnetite (HCVTM) is the best choice in industrial production [4,5]
The study focused on the basic HCVTM characteristics, sinter ratio, and metallurgical properties instead of focusing on the carbon thermal reaction in the HCVTM sintering process
Summary
The reserve of vanadium and titanium magnetite (VTM) is estimated at over 40 billion tons worldwide. It has a higher utilization value than the vanadium and titanium magnetite in Panzhihua, China (TFe 51.2%, V2 O5 0.6%, TiO2 13.4%, Cr2 O3 < 0.1%) [2,3]. The integrated utilization of HCVTM is extremely difficult, due to the complicated mineral composition. Our previous work was a fundamental study to optimize the composites ratio of HCVTM before feeding it into a blast furnace [6–10]. The study focused on the basic HCVTM characteristics, sinter ratio, and metallurgical properties instead of focusing on the carbon thermal reaction in the HCVTM sintering process. The coke ratio can affect the mineral composition and structure of sintered ore, which has a great influence on the quality of the sintered ore [11–18]. The Minerals 2017, 7, 107; doi:10.3390/min7070107 www.mdpi.com/journal/minerals
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