Coal-Based Reduction and Magnetic Separation Behavior of Low-Grade Vanadium-Titanium Magnetite Pellets

Cheng, Gongjin; Gao, Zixian; Lv, Mengyang; He, Yang; Xue, Xiangxin

doi:10.3390/min7060086

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…As known to all, high CS of finished pellets primarily relies on solid phase consolidation, then the liquid phase bonding . Figure reveals SEM images of finished LGVTMP with different wt% MgO at 200× and 1000×.…”

Section: Resultsmentioning

confidence: 84%

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Property Investigations of Low‐Grade Vanadium‐Titanium Magnetite Pellets with Different MgO Contents

Gao

Cheng

Xue

et al. 2018

steel research int.

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Properties of low-grade vanadium-titanium magnetite pellets (LGVTMP) with different MgO contents are investigated. Since MgO can ameliorate the properties of acid pellets, pure MgO reagent is added to LGVTMP as a MgO additive in this paper. The experimental results show that the compressive strength (CS) of different MgO-bearing LGVTMP has a decreasing trend with the increase of MgO content, but all of the pellets are above 2000 N/pellet and meet the requirement of the blast furnace production when the roasting temperature is 1250 C. And the mechanism of MgO on reduction swelling (RS) is different from hematite and magnetite. At 900 C, the RS of LGVTMP mainly occurs in the reduction process of Fe 2 O 3 ! Fe 3 O 4 ! FeO and Fe 2 TiO 5 ! Fe 2 TiO 4 under the atmosphere of 70% N 2 and 30% CO. Moreover, reduction swelling index (RSI) of LGVTMP increases first and then decreases with the increase of MgO content, and 1.25% MgO pellets have worse RSI of 17.9%. In addition, adding MgO can improve the reducibility of LGVTMP due to the decrease of Fe 2 TiO 5 content.

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Section: Resultsmentioning

confidence: 84%

“…About this new‐type vanadium‐titanium magnetite, viz. low‐grade vanadium‐titanium magnetite (LGVTM), the previous study mainly focused on the utilization by a non‐blast furnace process . The properties of the vanadium‐titanium magnetite in the blast furnace are not clear.…”

Section: Introductionmentioning

confidence: 99%

Property Investigations of Low‐Grade Vanadium‐Titanium Magnetite Pellets with Different MgO Contents

Gao

Cheng

Xue

et al. 2018

steel research int.

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“…In the past decades, the direct reduction of VTM concentrates by solid reductants has been widely researched [24][25][26][27]. It was found that the reduction of VTM concentrates was more difficult than magnetite due to the different crystal structures and the presence of titanium.…”

Section: Melting Furnacementioning

confidence: 99%

Influence of Parameters on the Pre-Reduction Process of Vanadium-Titanium Magnetite Carbon-Containing Composite Pellets in Rotary Kiln

Wang

Ding

et al. 2020

Metals

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A novel smelting reduction process called pre-reduction in rotary kiln and total oxygen melting pool is a promising route to reduce environmental pollution from the ironmaking industry. In this paper, the process parameters and appropriate efficiency of reduction in the pre-reduction process of the rotary kiln were investigated via the detection of the metallization rate, phase composition, and internal morphology of the product combining with the analysis of the off-gas. The results indicated that the parameters of reduction temperature, reduction holding time, and coal ratio have a remarkable influence on the metallization rate. The reduction temperature has the most significant effect, followed by the reduction time and the coal ratio. Furthermore, under the condition of reduction temperature 1000 °C, holding time 30 min, coal ratio = 1, a product with a metallization rate of more than 70% can be obtained, which meets the requirements of the rotary kiln process, and its CO2/CO value of the pre-reduction endpoint is appropriate. Continue to increase the temperature, holding time, and coal ratio can raise the metallization rate of the pellets, but only a little improvement and may cause reoxidation of the product.

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“…The reduction temperature of chromium oxides is relatively high. The molten chromium dissolves into the molten iron when the reduction of chromium oxide is completed . Hence, the reaction of chromium oxide is expressed by Equation which is calculated from Equation and (10).…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…The vanadium in CVTM is the trivalent vanadium (V 3+ ) forming a solid solution as vanadium spinel FeV 2 O 4 . The stepwise reduction of the vanadium oxides is as following path: FeV 2 O 4 → V 2 O 3 → VO → V → [V].…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Effect of MgO in Sinter and Primary‐Slag on Smelting Mechanism of Chromium‐Bearing Vanadium Titanomagnetite

Tang

Yang

Cheng

et al. 2018

steel research int.

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The effects of MgO in sinter and primary-slag on smelting mechanism of chromium-bearing vanadium titanomagnetite (CVTM) are investigated in this work. The XRF, XRD, ICP-AES, FT-IR, and rotating cylinder methods are applied to analyze CVTM sinter samples, primary-slag, and dripped iron. The results show that the softening interval and melting interval decrease and the cohesive zone moves down mildly and becomes narrowly with increasing MgO. The free running temperature of the primary-slag decreases from 1285 to 1234 C, the initial viscosity decreases from 1.13 to 0.92 Pa s, and the high-temperature viscosity decreases from 0.46 to 0.24 Pa s with increasing MgO. The depolymerization of the primary-slag structure enhances with increasing MgO, which has a significant effect on the shrinkage of primaryslag formation temperature interval and decreasing permeability of CVTM sinter burden. What's more, the dripping ratio increases from 82.7% to 97.7% and the dripping pressure drop increases from 1.1 to 1.9 kPa and reaches to a maximum value at 3.3% MgO. Moreover, both the recovery ratios of Cr and V increase from 20.49% to 28.07% and from 25.39% to 41.74%, respectively.

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Coal-Based Reduction and Magnetic Separation Behavior of Low-Grade Vanadium-Titanium Magnetite Pellets

Cited by 15 publications

References 21 publications

Property Investigations of Low‐Grade Vanadium‐Titanium Magnetite Pellets with Different MgO Contents

Property Investigations of Low‐Grade Vanadium‐Titanium Magnetite Pellets with Different MgO Contents

Influence of Parameters on the Pre-Reduction Process of Vanadium-Titanium Magnetite Carbon-Containing Composite Pellets in Rotary Kiln

Effect of MgO in Sinter and Primary‐Slag on Smelting Mechanism of Chromium‐Bearing Vanadium Titanomagnetite

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