Influence of Matrix Strength and Pore Structure on Sinter Cake Strength

Oyama, Nobuyuki; Nushiro, Kouichi; Konishi, Yukio; Igawa, Katsutoshi; Sorimachi, Kenichi

doi:10.2355/tetsutohagane1955.82.9_719

Cited by 22 publications

(14 citation statements)

References 4 publications

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“…In more detail, the pores over 5 mm improved the permeability in the sintering bed 25) and the pores (1-5 mm) deteriorated sinter strength. 26) Although, there were various theories 27,28) for the diameter of micro pores to improve JIS-RI, the diameter was defined under 1 μm in these research. Therefore the sintering tests were performed with a X-ray CT scanner 29) to observe the changes of the pore structure in the sinter cake directly, which had been remodeled to enable the LNG injection.…”

Section: Observation Methods Of Pore Structure With X-raymentioning

confidence: 99%

Development of Secondary-fuel Injection Technology for Energy Reduction in the Iron Ore Sintering Process

Oyama¹,

Iwami²,

Yamamoto³

et al. 2011

ISIJ Int.

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100

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JFE Steel Corporation developed the hydrogen-based gas fuel injection technology for sintering machines to improve sinter quality without increasing coke breeze ratio. With the technology, it is possible to extend the temperature zone between 1 200°C and 1 400°C by injecting the gaseous fuel from the top surface of the sintering machine as a partial substitute for coke breeze. Theoretical and experimental studies were carried out to verify the effect of the gaseous-fuel injection technology on pore structure in the sinter cake with the X-ray CT scanner and sintering pot test.It is important to hold the temperature between 1 200°C and 1 400°C in order to produce high strength and high reducibility sinter. The liquid phase ratio can be increased with extending the proper temperature zone by applying the gaseous fuel injection technology. The increase in liquid phase ratio promotes the combination of pores (1-5 mm) and sinter strength is improved. At the same time, the pores over 5 mm growth are promoted and the permeability is improved in the sintering bed. Moreover, the low-temperature sintering process depresses the iron ore self-densification. Micro pores under 1 μm remain in unmelted ores and improve sinter reducibility. As a result, the technology enables to improve the pore structure in the sinter cake and sinter quality.The technology was put into commercial operation at Keihin No. 1 sinter plant in January 2009 and stable operation has continued up to the present. As a result, the energy efficiency in the sintering process is greatly improved, and it has been achieved to reduce CO2 emissions by a maximum of approximately 60 000 t/year at Keihin No. 1 sinter plant.

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Section: Observation Methods Of Pore Structure With X-raymentioning

confidence: 99%

Development of Secondary-fuel Injection Technology for Energy Reduction in the Iron Ore Sintering Process

Oyama¹,

Iwami²,

Yamamoto³

et al. 2011

ISIJ Int.

Self Cite

100

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show abstract

“…17, although the mass percentage of fines under 4 mm in size and the low-temperature reduction-disintegration of sinter products did not change greatly by applying the "segregation granulation method", the tumble strength and reducibility index (JIS-RI) of sinter improved. The improvement in tumble strength, which is the cold strength, is attributed to the reduction number of pores with an intermediate size of 0.5 to 5 mm that adversely affects the cold strength, 19) resulting from the improved melt fluidity shown in the above Fig. 12 due to applying the segregation granulation method.…”

Section: Operational Test Results At Commercial Plantmentioning

confidence: 99%

“…The content of hematite, magnetite and quaternary calcium-ferrite in sinter were quantified using powder X-ray diffraction analysis, and the residue was roughly classified into four compositions as the amorphous silicate quantitative analysis method for various minerals, described in the previous report. 19) In addition, primary hematite (original iron ore) and secondary hematite once crystallized after melting were separately quantified according to shape using both an optical microscope and an image analyzer, and their mass ratio was calculated based on area ratio. As for the pore structure in sinter product, fine pore volume and pore size distribution of 500 mm or less in sample of approximately 10 g in mass and 4-7 mm in size were measured using a mercury porosimeter as in case of the iron ore. Figure 6 shows the pressure drop of each sintering zone in sinter bed at a time of 300 s after ignition.…”

Section: Operation Test At Commercial Sinter Plantmentioning

confidence: 99%

Effect of High-phosphorous Iron Ore Distribution in Quasi-particle on Melt Fluidity and Sinter Bed Permeability during Sintering

Oyama¹,

Higuchi²,

Machida³

et al. 2009

ISIJ Int.

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The effect of high P Brockman ore on the melt fluidity was investigated to make clear the mechanism for the deterioration of permeability of sinter bed during sintering.Blending high-P ore, characterized by the high porosity and fine size distribution, decreased melt fluidity by the absorption of melt into porous high P Brockman ore. As a result, the pressure drop of sinter bed increased during sintering by the suppression of pore growth, and the sinter productivity decreased.To improve the sinter productivity using high-P Brockman ore, JFE Steel has developed an advanced granulation process characterized by segregating high-P Brockman ore at the center of quasi-particle, which was coated by coke breeze and limestone. It is important to select the suitable coating thickness of dense hematite ore around porous iron ore for preventing from the melt absorption into iron ore. This process controls the excess melting reaction between iron ore and limestone, owing to the segregation of high-P ore within the quasi-particles.The commercial plant trials showed that the desirable melt fluidity, resulting from the segregation of high-P ore in a quasi-particle, enhanced the permeability of sinter bed at Fukuyama No. 4 Sinter Plant of JFE Steel. The application of new granulation process remarkably improved both the productivity and reducibility of sinter products, in spite of the recent inferior ore conditions.

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“…Moreover, because CF is the texture with highest strength among the hematite, magnetite, CF, and AS textures that form in sintered ore, the strength of sintered ore is improved by increasing the CF ratio. 19,20) Thus, the fact that the CF ratio in sintered ore increases, as shown in Fig. 8, due to an increased oxygen concentration in the sintering bed atmosphere is also considered to be one factor in higher strength.…”

Section: Effect Of Oxygen Enrichment On Sintering Behavior In Actual mentioning

confidence: 99%

Effect of Oxygen Enrichment on Mineral Texture in Sintered Ore with Gaseous Fuel Injection

Iwami¹,

Yamamoto²,

Higuchi³

et al. 2015

ISIJ Int.

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Influence of Matrix Strength and Pore Structure on Sinter Cake Strength

Cited by 22 publications

References 4 publications

Development of Secondary-fuel Injection Technology for Energy Reduction in the Iron Ore Sintering Process

Development of Secondary-fuel Injection Technology for Energy Reduction in the Iron Ore Sintering Process

Effect of High-phosphorous Iron Ore Distribution in Quasi-particle on Melt Fluidity and Sinter Bed Permeability during Sintering

Effect of Oxygen Enrichment on Mineral Texture in Sintered Ore with Gaseous Fuel Injection

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