Reaction Mechanism of In-situ Carbon in Hematite Ore Pellet during Induration

Ayyandurai, Ammasi; Pal, Jagannath

doi:10.1080/08827508.2020.1825954

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…A further mechanism of sintering and oxide bridging succeeded in the presence of coke. On combustion at low temperature, by releasing CO/CO 2 , hematite reduction to magnetite occurs [21]. Since iron ore No.1 and 2 pellets both are hematite ore, hematite begins to react above 1280 • C, while initial crystal formation promotes the strength.…”

Section: Physical Properties (Cold Compression Strength (Ccs) and App...mentioning

confidence: 99%

“…Carbon addition accesses the various reactions, such as hematite reduction-produced magnetite conversion, to secondary hematite, which is less reducible than primary hematite because increasing the firing temperature lowers the reducibility. Iron Ore No.2 pellets have more fineness preventing oxygen removal, which decreases the reducibility [21,38]. The pellets fired at 1250 • C reflect the higher reducibility since they have a lower magnetite phase and less silicate/slag bond with a higher pore phase.…”

Section: Minimal Ccs Pelletsmentioning

confidence: 99%

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Experimental Investigation of Different Fineness and Firing Temperatures on Pellets Properties of Different Iron Ore fines from Indian Mines

et al. 2022

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In India, during mining and ore processing, ore fine generation is a common phenomenon, in which more than 60% of process ore becomes discarded material. To explore the alternative of high-grade ores, mutual replacement with the utility of dump ore fines is the best way. With this perspective, Kiruburu iron ore mine (Iron Ore No.1) and Meghataburu iron ore mine (Iron Ore No.2) dumped fines were chosen for a Blaine no. investigation, in the connection of firing temperatures, to get optimum desirable physical properties, Cold Compression Strength (C.C.S.),and Apparent Porosity (A.P.), with physico-chemical properties, Reducibility Degradation Index (R.D.I.), and Reducibility Index (R.I.). To characterize pellet properties with input variables, a microstructure phase study has been conducted using a scanning electron microscope (S.E.M.), energy dispersive spectroscopy (EDS), and X-ray diffraction analysis (XRD). The Iron Ore No.1 and 2 fine pellets survey showed good, desirable properties, at the Blaine no., of 1678 cm2/g and 2311 cm2/g (corresponding to 200 mesh size), and the best results are attained at a firing temperature of 1300 °C. Thermal kinetic analysis of the heating of pellets has been done to knowthe activation energy of different ore characteristics. The results showed that Iron Ore No.2 pellets have high activation energy.

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Section: Physical Properties (Cold Compression Strength (Ccs) and App...mentioning

confidence: 99%

Section: Minimal Ccs Pelletsmentioning

confidence: 99%

Experimental Investigation of Different Fineness and Firing Temperatures on Pellets Properties of Different Iron Ore fines from Indian Mines

et al. 2022

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Thermal Decomposition of Hematite Ore Fines in Air

Anand,

Pande,

Kumar

et al. 2024

steel research int.

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Thermal decomposition of hematite plays an important role during pelletization and the iron fine‐based smelting processes such as HIsarna and flash shaft smelter. The temperature at which pure hematite decomposition occurs depends on the partial pressure of oxygen in the gaseous atmosphere. In the air, that is, at = 0.21, the hematite decomposes at 1386 °C. In the present work, for an ore of a given composition, the effect of gangue on the thermal decomposition of hematite is experimentally determined using thermogravimetric analysis (TGA). A decomposition temperature of 1320 °C is found in the platinum crucible after analyzing the TGA curve. Thermodynamic calculations have been carried out using FactSage8.1 to investigate the effect of gangue on the stability of hematite. Thermodynamics calculations confirm that the hematite present in the ore decomposes at a lower temperature with the increase in the gangue content. Additionally, if gangue content can affect the temperature at which dissociation of hematite occurs, it is expected that the crucible material can also affect the dissociation. Interestingly most of the reported TGA experiments are performed either in alumina crucibles or it was not reported in the literature. Therefore, the effect of crucible materials, namely alumina and platinum, is also investigated.

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