scholarly journals Study on Sintering Characteristics of Ultra-Poor Vanadium-Titanium Magnetite

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 515
Author(s):  
Songtao Yang ◽  
Mi Zhou ◽  
Tao Jiang ◽  
Xiangxin Xue
Keyword(s):  
Blast Furnace ◽  
Flame Front ◽  
The Self ◽  
Front Speed ◽  
High Basicity ◽  
Comprehensive Index ◽  
Bonding Phase ◽  
Vanadium Titanium ◽  
Acid Pellet ◽  
Titanium Magnetite

Artificial rich ore for blast furnace use can be produced by sintering ultra-poor vanadium-titanium magnetite (PVTM) with a high-grade iron concentrate. Here, acid (R = 0.33, 0.50), self-fluxing (R = 1.10), and high-basicity (R = 2.60) PVTM sinters were produced in a sinter pot. Their performances were determined using the comprehensive index. The microstructures of the PVTM sinter were observed by metallographic microscope and scanning electron microscopy equipped with an energy dispersion spectrum (SEM-EDS). The results suggest that the acid PVTM sinter had a low flame front speed, low productivity, an uneven size distribution, and poor softening properties. It did have a high tumble index (TI) and low-temperature reduction disintegration index (RDI). The self-fluxing PVTM sinter had the worst performance (TI, RDI, reducibility index (RI)), while the high-basicity PVTM sinter had the highest flame front speed, highest productivity, a reasonable size distribution, excellent softening properties, and satisfactory TI and RDI values. The main consolidation form of the acid sinter was crystal stock, the main bonding phase of the self-fluxing sinter was silicate, and the main bonding phase of the high-basicity sinter was silico-ferrite of calcium and aluminum (SFCA). The comprehensive index values (from high to low) were the high-basicity (R = 2.60), acid (R = 0.50), natural acid (R = 0.33), and self-fluxing (R = 1.10) PVTM sinters. When the production capacity of the acid pellet was in shortage, the acid PVTM sinter (R = 0.50) could be produced by the surplus from the sinter plant. This replaced a part of the acid pellet and the burden structural model of the blast furnace smelting vanadium so the titanium burden could adopt a ‘high-basicity PVTM sinter + acid V-Ti pellet + acid (R = 0.50) PVTM sinter’.

Reduction behavior of vanadium-titanium magnetite carbon composite hot briquette in blast furnace process

2019 ◽  
Vol 342 ◽  
pp. 214-223 ◽  
Author(s):  
Wei Zhao ◽  
Mansheng Chu ◽  
Hongtao Wang ◽  
Zhenggen Liu ◽  
Jue Tang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Carbon Composite ◽  
Blast Furnace Process ◽  
Reduction Behavior ◽  
Furnace Process ◽  
Vanadium Titanium ◽  
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.

Experimental Study of Softening and Melting Properties on Indonesia Vanadium-Titanium Sinters

2011 ◽  
Vol 284-286 ◽  
pp. 1039-1043 ◽  
Author(s):  
Qiang Jian Gao ◽  
Guo Wei ◽  
Lin Mu ◽  
Gang Du ◽  
Feng Man Shen
Keyword(s):  
Blast Furnace ◽  
Molten Slag ◽  
Softening Temperature ◽  
Melting Zone ◽  
Raw Material ◽  
Blast Furnace Process ◽  
Furnace Process ◽  
Melting Properties ◽  
Vanadium Titanium ◽  
Titanium Magnetite

As a raw material, Indonesia vanadium-titanium sinters are being applied to the blast furnace process for iron making in the typical iron and steel plant. In order to keep the health running of blast furnace process, in this work we have investigated the softening and melting properties of Indonesia vanadium-titanium sinters. We found that the content of vanadium-titanium magnetite in sinter is correlated with the softening and melting ranges for those sinters considered here. With the increasing of the vanadium-titanium magnetite in sinter, the starting softening temperature increases gradually and the final softening temperature increases as well, thereby the softening range becomes narrow. Both starting and final melting temperatures begin to ascent, and the variation of melting range is not obvious. In addition, we also found that the coke is wetted by the molten slag and iron. From the viewpoint of blast furnace process, the softening and melting zone has to move downward. In this zone of blast furnace the contact area of solid-liquid phase will get larger because of the close contract among the molten slag, iron and coke. On one hand, this kind of behavior can definitely speed up the reduction of iron oxide. On the other hand, it simultaneously worse the ventilation properties and affect the normal running of air flow, because a lot of iron and slag can not be got smoothly into the hearth through coke layer.

scholarly journals Effect of Basicity on Sintering Behavior and Metallurgical Properties of High-Chromium Vanadium-Titanium Magnetite

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 569
Author(s):  
Liheng Zhang ◽  
Zixian Gao ◽  
Songtao Yang ◽  
Weidong Tang ◽  
Xiangxin Xue
Keyword(s):  
Sintering Behavior ◽  
High Chromium ◽  
Softening Behavior ◽  
Comprehensive Index ◽  
Opposite Trend ◽  
Melting Properties ◽  
Vanadium Titanium ◽  
Disintegration Index ◽  
Index Value ◽  
Titanium Magnetite

Basicity has an important effect on the behavior of high-chromium vanadium-titanium magnetite (HCVTM) sinter. The effect of basicity on sintering, reduction, and softening-melting properties was investigated in an experiment-scale sinter pot. The results showed that with the basicity increasing from 1.7 to 2.5, the vertical sinter speed, the productivity, the particle size, the reduction disintegration index (RDI), and the reducibility index (RI) increased. The yield increased first and then decreased, while the tumble index (TI) had the opposite trend. The perovskite content increased first and then stabilized, and the silico-ferrite of calcium and aluminum (SFCA) increased from the basicity of 2.3. The HCVTM sinter had a better tendency of the softening behavior with the basicity increase. In addition, the melt droplet comprehensive index S increased, which indicated that the increase in basicity negatively affected the droplet performance. As the basicity increased, the comprehensive index value increased. Considering the adverse effect of basicity on softening-melting properties, the best recommended value is 2.3.

scholarly journals Investigations of MgO on Sintering Performance and Metallurgical Property of High-Chromium Vanadium-Titanium Magnetite

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 324 ◽  
Author(s):  
Liheng Zhang ◽  
Songtao Yang ◽  
Weidong Tang ◽  
Xiangxin Xue
Keyword(s):  
X Ray Diffraction ◽  
Metallurgical Property ◽  
Degradation Index ◽  
High Chromium ◽  
Comprehensive Index ◽  
Uniform State ◽  
Melting Properties ◽  
Vanadium Titanium ◽  
Reduction Index ◽  
Titanium Magnetite

High-chromium vanadium-titanium magnetite (HCVTM) in the Hongge region has been used as an essential mineral resource in ironmaking. The effects of MgO on sintering performance and metallurgical properties were investigated by sintering pot tests, X-ray diffraction (XRD), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS). HCVTM sinters with varying MgO contents (2.7–3.5%), which was achieved by adding dolomite, were tested for yield, strength, reduction degradation index (RDI), reduction index (RI), and softening-melting properties. The productivity and the comprehensive index were evaluated. The results show that yield and productivity increased, while the vertical sintering speed and the tumbler index (TI) initially increased then decreased with the increase of MgO content. The mineral structure of HCVTM sinter changed from a non-uniform state to a uniform state with increased MgO content. Most of the Mg2+ entered the magnetite lattice, while a small amount entered the perovskite and the calcium silicate. The increase of MgO content improved RDI and softening-melting properties while reducing RI. The best recommended amount of MgO was 3.3% from the comprehensive index.

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