Formation Mechanism of Acicular Calcium Ferrite of Iron Ore Sinter

Hida, Yukihiro; Okazaki, Jun; Itoh, Kametaro; Sasaki, Minoru

doi:10.2355/tetsutohagane1955.73.15_1893

Cited by 55 publications

(35 citation statements)

References 1 publication

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“…Solid state roasting can avoid the reaction of samples with alumina crucible and the generation of wustite in the reacted samples. 11,12) The samples were crushed and sieved into powder ( < 74 μm) for subsequent tests.…”

Section: Methodsmentioning

confidence: 99%

Effect of Silica on Reduction of Calcium Ferrite with CO–N2 Gas Mixtures

Ding

Xuan

et al. 2017

ISIJ Int.

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Section: Methodsmentioning

confidence: 99%

Effect of Silica on Reduction of Calcium Ferrite with CO–N2 Gas Mixtures

Ding

Xuan

et al. 2017

ISIJ Int.

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“…Since iron ore sinter is sintering through liquid phase, if the liquid phase can be made to generate for a short time and at low temperature, it will become possible cutting down the energy in the sintering process. By the way, it is reported 1) that the composition of primary melt in sintering process is similar to monocalcium ferrite (CaO · Fe 2 O 3 ) and the lowest temperature of melt formation in the CaO-Fe 2 O 3 system 2) is 1 205°C. Therefore, if the formation temperature of the primary melt can be reduced from this temperature, it will become possible to cut down the energy in the sintering process.…”

Section: Introductionmentioning

confidence: 99%

Formation Rate of Calcium Ferrite Melt Focusing on SiO2 and Al2O3 Component

et al. 2004

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The effect of the particle size of hematite on the formation rate of calcium ferrite melt and the dissolution rate of solid hematite into molten calcium ferrite were investigated. Without regard to the particle size of hematite, the addition of SiO 2 was more effective than the addition of Al 2 O 3 for increasing the melting rate and reducing the melt formation temperature in calcium ferrite system. On the other hand, the addition of Al 2 O 3 was more effective than the addition of SiO 2 for increasing the dissolution rate of solid hematite into the generated molten ternary calcium ferrite. The amount of dissolved hematite into molten calcium ferrite increased linearly with increasing the immersion time. The dissolution rate of solid hematite into molten calcium ferrite was mostly determined by D(mol%Fe 2 O 3 ) that was considered to be the driving force of the dissolution and the effect of the revolution speed on the amount of dissolved hematite can be negligible. Therefore, the dissolution reaction of solid hematite at the reaction interface was the rate-controlling step under the condition of this study.KEY WORDS: calcium ferrite; particle size; melt formation rate; dissolution rate; iron ore sintering.

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“…SFCA-I remains in the sinter in the case of a lower peak temperature. 15,16) SFCA is inferior to SFCA-I in terms of the reducibility and reduction degradation index. Therefore, it is important to control the peak temperature in the sinter bed in order to have more SFCA-I content.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the difficulty in in situ observations at the high heating rate, there are still many debates on the formation mechanism of SFCA-I and other forms of calcium ferrites. [4][5][6][7][14][15][16][17] As shown above, the temperature in the sinter bed has a strong impact on the quality and yields of the sinter.…”

Section: Introductionmentioning

confidence: 99%

In Situ Temperature Measurement of Sinter Beds at High Spatial and Time Resolution

Taira

Matsumura

2018

ISIJ Int.

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In the sintering process during iron making, the sintering reaction proceeds in a packed bed along with the combustion of coke particles. Although detailed temperature information is necessary to improve the process, it is difficult to measure the temperature distribution inside the packed bed with high spatial and time resolution. We performed in situ temperature measurement inside the sinter bed at high spatial and time resolution, i.e., 2 mm and 10 s, respectively, during sintering. A sheathed thermocouple was scanned at optimized scan speed along the inside of the thin-wall alumina tube which was held perpendicular inside the sinter bed. The information on the temperature variation during sintering showed a clear correlation between the quality of the sinter and the sinter heat pattern for each layer. Further analysis also showed that the flame front speed is proportional to the O 2 consumption in the sinter bed. The temperature measurement technique enabled an unprecedented detailed discussion with the temperature distribution inside the sinter bed during sintering. This technique will not only help to improve the sintering process but also provide beneficial information on the chemical reactions occurring inside packed beds.

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Formation Mechanism of Acicular Calcium Ferrite of Iron Ore Sinter

Cited by 55 publications

References 1 publication

Effect of Silica on Reduction of Calcium Ferrite with CO–N<sub>2</sub> Gas Mixtures

Effect of Silica on Reduction of Calcium Ferrite with CO–N<sub>2</sub> Gas Mixtures

Formation Rate of Calcium Ferrite Melt Focusing on SiO2 and Al2O3 Component

<i>In Situ</i> Temperature Measurement of Sinter Beds at High Spatial and Time Resolution

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