scholarly journals Influence of Coke Ratio on the Sintering Behavior of High-Chromium Vanadium-Titanium Magnetite

Minerals ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 107 ◽  
Author(s):  
Songtao Yang ◽  
Mi Zhou ◽  
Weidong Tang ◽  
Tao Jiang ◽  
Xiangxin Xue ◽  
...  
Keyword(s):  
Sintering Behavior ◽  
High Chromium ◽  
Vanadium Titanium ◽  
Titanium Magnetite

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.

Phases Transition and Consolidation Mechanism of High Chromium Vanadium-Titanium Magnetite Pellet by Oxidation Process

2016 ◽  
Vol 35 (7) ◽  
pp. 729-738
Author(s):  
Jue Tang ◽  
Man-sheng Chu ◽  
Cong Feng ◽  
Feng Li ◽  
Zheng-gen Liu
Keyword(s):  
Phase Transition ◽  
Oxidation Process ◽  
Consolidation Process ◽  
High Chromium ◽  
Oxidized Pellet ◽  
Three Stages ◽  
Roasting Temperature ◽  
Vanadium Titanium ◽  
Roasting Time ◽  
Titanium Magnetite

AbstractBased on the fundamental characteristics of high chromium vanadium-titanium magnetite (HCVTM), the effects of roasting temperature and roasting time on the phase transition and oxidation consolidation during the oxidation were investigated systematically. It was shown that the oxidation of HCVTM pellet was not a simple process but complex. With increasing roasting temperature and time, the compressive strength of oxidized pellet was improved. The phase transition during oxidation was hypothesized to proceed as follows: (1) Fe3O4 → Fe2O3; (2) Fe2.75Ti0.25O4 → Fe9TiO15 + FeTiO3 → Fe9TiO15 + Fe2Ti3O9; (3) Fe2VO4 → V2O3 → (Cr0.15V0.85)2O3; (4) FeCr2O4 → Cr2O3 → Cr1.3Fe0.7O3 + (Cr0.15V0.85)2O3. The oxidation consolidation process was divided into three stages: (1)oxidation below 1,173 K; (2) recrystallization consolidation at 1,173 – 1,373 K; (3) particle refining recrystallization-consolidation by the participation of liquid phase at 1,373 – 1,573 K. To obtain the HCVTM oxidized pellet with good quality, the rational roasting parameters included a roasting temperature of 1,573 K and a roasting time of 20 min.

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