“…Titanium was mainly present in sea sand ore in the form of titanomagnetite. Titanomagnetite (TTM) refers to a class of spinel oxides with the stoichiometry Fe 3− x Ti x O 4 , where 0 ≤ x ≤ 1 [23]. The main phases of SJY were haematite (Fe 2 O 3 ), magnetite (Fe 3 O 4 ) and silicon oxide (SiO 2 ), and GOK was mainly composed of magnetite (Fe 3 O 4 ) and a small amount of silicon oxide (SiO 2 ). Figure 1. Phase composition and particle size distribution diagram of raw materials: (a) X-ray diffraction analysis pattern and micro-morphology; (b) Particle size distribution diagram.…”
The compressive strength of pellets is of great significance for the evaluation of pellets quality indexes. In this paper, the chemical composition, mineral phase composition and microstructure of pellets were analyzed by ICPAES, XRD, OM and SEM-EDS through oxidation roasting and gasbased reduction experiments. The effect mechanism of thermal regulation on the compressive strength and reduction performance of pellets was explained by the micro-indicators such as porosity, Vickers hardness and morphological structure of pellets. The results showed that with the increase of the roasting temperature and the extension of the roasting time, the internal porosity of the oxidized pellets was reduced, while the compressive strength of the pellets was continuously improved, and the roasting temperature had a greater influence on the compressive strength. However, the increase in porosity of the reduced pellets weakened the intergranular bonding between the particles, which led to a reduction in compressive strength.
“…Titanium was mainly present in sea sand ore in the form of titanomagnetite. Titanomagnetite (TTM) refers to a class of spinel oxides with the stoichiometry Fe 3− x Ti x O 4 , where 0 ≤ x ≤ 1 [23]. The main phases of SJY were haematite (Fe 2 O 3 ), magnetite (Fe 3 O 4 ) and silicon oxide (SiO 2 ), and GOK was mainly composed of magnetite (Fe 3 O 4 ) and a small amount of silicon oxide (SiO 2 ). Figure 1. Phase composition and particle size distribution diagram of raw materials: (a) X-ray diffraction analysis pattern and micro-morphology; (b) Particle size distribution diagram.…”
The compressive strength of pellets is of great significance for the evaluation of pellets quality indexes. In this paper, the chemical composition, mineral phase composition and microstructure of pellets were analyzed by ICPAES, XRD, OM and SEM-EDS through oxidation roasting and gasbased reduction experiments. The effect mechanism of thermal regulation on the compressive strength and reduction performance of pellets was explained by the micro-indicators such as porosity, Vickers hardness and morphological structure of pellets. The results showed that with the increase of the roasting temperature and the extension of the roasting time, the internal porosity of the oxidized pellets was reduced, while the compressive strength of the pellets was continuously improved, and the roasting temperature had a greater influence on the compressive strength. However, the increase in porosity of the reduced pellets weakened the intergranular bonding between the particles, which led to a reduction in compressive strength.
“…China is rich in vanadium titanomagnetite (VTM) resources, with proven reserves of more than 38 billion tons, ranking fourth in the world [7,8]. Panzhihua in the Sichuan Province, Chengde in Hebei Province, and Chaoyang in Liaoning Province are the main distribution areas of vanadium titanomagnetite resources in China [9,10].…”
Vanadium titanomagnetite is an important mineral resource. It is a raw material for ironmaking, vanadium extraction, strategic metal titanium production, and titanium dioxide production. In this study, high chromium vanadium titanomagnetite (High-Cr VTM) and ordinary iron ore were used as raw materials for pelletizing. The effect of V2O5 on the preparation and properties of High-Cr VTM pellets was studied. The influence of V2O5 on the properties of the green pellets, the compressive strength of oxidized pellets, the reduction swelling index and reduction degree, softening-melting behavior, and the migration law of Fe, Ti, and Cr in the reduction process were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that with the increase in V2O5 content, the properties of the green pellets basically showed a trend of first decreasing and then increasing but all met the basic requirements of pelletizing. When the added amount of V2O5 in the pellet was 6%, the compressive strength of the oxidized pellet was the lowest at only 2565 N/pellet but it still met the quality requirements for pellets in blast furnace production. As the dosage of V2O5 increased, the reduction swelling index and reduction degree of the pellets showed a trend of first increasing and then decreasing. The addition of V2O5 can increase the softening initial temperature, softening final temperature, melting start temperature, and dripping temperature of the High-Cr VTM pellets, narrowing the softening interval, and expanding the melting dripping interval. The experimental results provided a data reference for revealing the influence of V2O5 on High-Cr VTM pellets during the blast furnace smelting process.
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