Phase transformation and slag evolution of vanadium–titanium magnetite pellets during softening–melting process

High-quality oxidized pellets are the basis to achieve high-efficiency utilization of vanadium–titanium magnetite (VTM) ores. Bentonite was used as a binder of VTM. The main phase composition of VTM is titanomagnetite and ilmenite. When the amount of bentonite is 1%, the compressive strength and dropping strength of VTM pellets can meet the requirements. To improve metallurgical properties, the pellets need to be roasted. The best conditions for roasting are as follows: calcination temperature of 1523 K and a calcination time of 20 min. The consolidation mechanism, phase transformation, and crystal structure transformation of VTM in the process of oxidation roasting are also explained.

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Isothermal reduction behavior and kinetics of Russian high-chromium vanadium-titanium magnetite pellets under gas atmospheres of CO–CO2–N2 and CO–N2 at 873 K–1173 K

Energy Sources Part A Recovery Utilization and Environmental Effects ◽

10.1080/15567036.2020.1795309 ◽

2020 ◽

pp. 1-18

Author(s):

Gongjin Cheng ◽

Xuefei Zhang ◽

Zixian Gao ◽

He Yang ◽

Xiangxin Xue

Keyword(s):

Reduction Behavior ◽

High Chromium ◽

Isothermal Reduction ◽

Magnetite Pellets ◽

Vanadium Titanium ◽

Kinetics Of ◽

Titanium Magnetite

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

steel research international ◽

10.1002/srin.201700543 ◽

2018 ◽

Vol 89 (6) ◽

pp. 1700543 ◽

Cited By ~ 5

Author(s):

Zixian Gao ◽

Gongjin Cheng ◽

Xiangxin Xue ◽

He Yang ◽

Peining Duan

Keyword(s):

Low Grade ◽

Magnetite Pellets ◽

Vanadium Titanium ◽

Titanium Magnetite

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Effect of Humic Acid Binder on Oxidation Roasting of Vanadium–Titanium Magnetite Pellets via Straight-Grate Process

Crystals ◽

10.3390/cryst11111283 ◽

2021 ◽

Vol 11 (11) ◽

pp. 1283

Author(s):

Yihui Yi ◽

Guanghui Li ◽

Pengxu Cao ◽

Xin Zhang ◽

Yongkang Zhang ◽

...

Keyword(s):

Compressive Strength ◽

Humic Acid ◽

Production Efficiency ◽

Pilot Scale ◽

Composite Binder ◽

Preheating Temperature ◽

Magnetite Pellets ◽

Vanadium Titanium ◽

Titanium Magnetite ◽

Bentonite Binder

The oxidation roasting of vanadium–titanium magnetite (VTM) pellets with a new composite binder was investigated using a pilot-scale straight-grate. The evolution of the chemical and phase composition, the compressive strength, and the metallurgical properties of the fired VTM pellets were investigated. Under a preheating temperature of 950 ∘C, a preheating time of 18 min, a firing temperature of 1300 ∘C, and a firing time of 10 min, the compressive strength of the fired pellets was as high as 2344 N per pellet. The fired pellets mainly consisted of hematite, pseudobrookite, spinel and olivine. The total iron content of the fired pellets was 0.97% higher using 0.75 wt% humic acid (HA) binder instead of 1.5 wt% bentonite binder. These properties are beneficial for the production efficiency and energy efficiency of their subsequent use in blast furnaces. Moreover, both the softening interval and the softening melting interval of the HA binder pellets were narrower than those of the bentonite binder pellets, conducive to the smooth and successful smelting of the VTM pellets in a blast furnace.

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