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

Crystals ◽  
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.

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

Minerals ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 86 ◽  
Author(s):  
Gongjin Cheng ◽  
Zixian Gao ◽  
Mengyang Lv ◽  
He Yang ◽  
Xiangxin Xue
Keyword(s):  
Magnetic Separation ◽  
Low Grade ◽  
Magnetite Pellets ◽  
Vanadium Titanium ◽  
Separation Behavior ◽  
Titanium Magnetite

scholarly journals Effect of B2O3 Content on the Sintering Basic Characteristics of Mixed Ore Powder of Vanadium-Titanium Magnetite and Hematite

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Hao Liu ◽  
Ke Zhang ◽  
Qingfeng Ling ◽  
Yuelin Qin
Keyword(s):  
Compressive Strength ◽  
Liquid Phase ◽  
Fine Powder ◽  
Softening Temperature ◽  
Phase Index ◽  
Calcium Magnesium ◽  
Bonding Phase ◽  
Vanadium Titanium ◽  
Basic Characteristics ◽  
Titanium Magnetite

The sintering basic characteristics of iron ore play a key role in the process of sintering. In this study, the effects of B2O3 on the assimilation characteristics, softening temperature, fluidity of liquid phase, compressive strength of bonding phase, and microstructure of the mixed fine powder of hematite and vanadium-titanium magnetite (H-VTM) are studied. Results show that B2O3 content from 0%–5% (wt%) could improve the assimilation characteristics of the H-VTM and increase the amount of the liquid phase. The liquidity of the bonding phase index (LBPI) of the H-VTM increases from 3.7 to 24.2. When B2O3 content exceeds 2%, the diameter of the pore in the H-VTM sintered samples enlarges. However, the compressive strength gradually decreases. Boron and calcium-magnesium-aluminium elements are abundant in the bonding phase, which can reduce the formation of calcium silicate and perovskite in H-VTM sintered samples.

scholarly journals Preparation, Sintering Behavior and Consolidation Mechanism of Vanadium-Titanium Magnetite Pellets

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 188
Author(s):  
Weibin Chen ◽  
Zhaoqi Dong ◽  
Yang Jiao ◽  
Lili Liu ◽  
Xidong Wang
Keyword(s):  
High Efficiency ◽  
Sintering Behavior ◽  
Structure Transformation ◽  
Calcination Time ◽  
High Quality ◽  
Oxidized Pellets ◽  
Crystal Structure Transformation ◽  
Magnetite Pellets ◽  
Vanadium Titanium ◽  
Titanium Magnetite

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.

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

2018 ◽  
Vol 89 (6) ◽  
pp. 1700543 ◽  
Author(s):  
Zixian Gao ◽  
Gongjin Cheng ◽  
Xiangxin Xue ◽  
He Yang ◽  
Peining Duan
Keyword(s):  
Low Grade ◽  
Magnetite Pellets ◽  
Vanadium Titanium ◽  
Titanium Magnetite

scholarly journals Effect of Cr2O3 on the Reduction and Smelting Mechanism of High-Chromium Vanadium-titanium Magnetite Pellets

2016 ◽  
Vol 56 (11) ◽  
pp. 1938-1947 ◽  
Author(s):  
Gong-jin Cheng ◽  
Xiang-xin Xue ◽  
Zi-xian Gao ◽  
Tao Jiang ◽  
He Yang ◽  
...  
Keyword(s):  
High Chromium ◽  
Magnetite Pellets ◽  
Vanadium Titanium ◽  
Titanium Magnetite
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