Improvement of Sintering of Iron Ore Fines by Producing Pseudo-particles with Different CaO Content

Kawaguchi, Takazo; Kuriyama, Kazuyoshi; Sato, Shun; Takata, Kouzo

doi:10.2355/tetsutohagane1955.76.10_1642

Cited by 17 publications

(6 citation statements)

References 3 publications

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“…This process has been applied in lots of Japanese sinter plant in various styles [4][5][6] based on fundamental study as duplex mini-pellet. 7) When introducing the process, granulation device generally called "mixer" has also examined for determination of essential mechanical parameters, for example angle size and rotation speed.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Sinter Productivity by Adding Return Fine on Raw Materials after Granulation Stage

Matsumura¹,

Yamaguchi²,

Hara³

et al. 2013

ISIJ Int.

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In order to increase the permeability of the sintering bed for sinter ore productivity, RF-MEBIOS (Return Fine -Mosaic Embedding Iron Ore Sintering) process, in which return fine as dry particle is added on granulated raw materials and then they are charged into sintering machine, is proposed. In RF-MEBIOS, it is demonstrated by pot tests that productivity increases at the same moisture content in sinter mixture at charging. This productivity increase is caused by higher permeability in sinter packed bed due to two major phenomena. One is increasing the pseudo-particle size at granulation and the other is decreasing the bulk density of sinter packed bed after charging. The former is achieved by a higher moisture content in the raw materials at granulation, which has the role of decreasing small size of pseudo-particle (-0.25 mm). The latter is achieved by higher friction in the packed bed composed of dry and wet particles compound, which has a role of decreasing bulk density. In the development of RF-MEBIOS, return fine was chosen as the dry particle because it is dry when produced by the sintering machine. The sinter productivity increases with the increase of the quantity of the return fine added after granulation stage. The effect of pseudo-particle (-0.25 mm) ratio and ε on flame front speed were evaluated as 55% and 41% to increase of frame front speed, respectively.Effect of RF-MEBIOS on sinter productivity is confirmed in No.3 sinter plant in Kashima Steel Works. Under the condition of constant moisture content in sinter mixture at charging, this improvement degree is proportioning to the ratio of bypass return fine which is added to granulated the other sinter materials without granulation. It means granulation at higher moisture has superiority compared to increase of fine material in bypass return fine.Finally, RF-MEBIOS method is installed on three commercial sintering machines (Kashima, Wakayama, and Kokura) belonging Sumitomo Metals. In all three sinter plants, productivity increase has been confirmed. Therefore, introducing RF-MEBIOS has been demonstrated to cause a universal improvement of sinter productivity.

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Section: Introductionmentioning

confidence: 99%

Improvement of Sinter Productivity by Adding Return Fine on Raw Materials after Granulation Stage

Matsumura¹,

Yamaguchi²,

Hara³

et al. 2013

ISIJ Int.

Self Cite

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“…[1][2][3][4][5] Therefore, various methods of controlling the fluidity of the melts generated during sintering have been proposed. [6][7][8][9][10] The importance of melt behavior in sintering, and particularly melt fluidity, is generally recognized. However, due to the complexity of the reaction and unsteady temperature conditions in sintering, fluidity is grasped not the viscosity of liquid but the one of suspension.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Chemical Composition and Viscosity of Melts during Iron Ore Sintering

Machida¹,

Nushiro²,

Ito³

et al. 2005

ISIJ Int.

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The viscosity of the melts formed in the sintering reaction was measured for evaluating the fluidity of the melts, which play a crucial role in the sintering process. Using the sphere draw-up method carried out the measurements of high temperature viscosity. With low-melting point compositions of the Fe 2 O 3 -CaO-SiO 2 system, the viscosity of high SiO 2 content melts (Fe 2 O 3 /CaO/SiO 2 ϭ38.5/34.5/27.0 weight basis) was 5 times higher than that of low SiO 2 content melts (Fe 2 O 3 /CaOϭ80/20). The viscosity of low SiO 2 content increased with addition of Al 2 O 3 and SiO 2 . Similarly, with melt compositions generated from actual ores, viscosity depended on the contents of Al 2 O 3 and SiO 2 .Based on the results, the viscosity of the melted liquid was estimated from the chemical composition, and the viscosity of the solid-liquid coexistence phase was also evaluated using a viscosity calculating equation for suspensions. The viscosity distribution of the solid-liquid coexistence phase at 1 300°C in the ternary composition system Fe 2 O 3 -CaO-SiO 2 was obtained.

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“…To avoid the influence of it, the selective granulation 2) was introduced to Nippon Steel Co. Oita works to involve Al 2 O 3 element that disturb the sintering reaction of iron ore to granulated particle, and to control dispersion of Al 2 O 3 into the sintering bed. On the other hand, Sumitomo Metals Co. introduced CaO separated granulation method 3,4) to decrease the reduction degradation index (RDI) by controlling the secondary hematite to granulate separately the ore component of high CaO and low CaO. But, the improvement of the granulating process has the problem that capital investment is large, and the flexible correspondence to the change in the resource trend is difficult.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Coke Breeze Segregation in Sintering Bed under High Pisolite Ore Ratio

Machida¹,

Higuchi²,

Oyama³

et al. 2009

ISIJ Int.

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Improvement of Sintering of Iron Ore Fines by Producing Pseudo-particles with Different CaO Content

Cited by 17 publications

References 3 publications

Improvement of Sinter Productivity by Adding Return Fine on Raw Materials after Granulation Stage

Improvement of Sinter Productivity by Adding Return Fine on Raw Materials after Granulation Stage

Experimental Evaluation of Chemical Composition and Viscosity of Melts during Iron Ore Sintering

Optimization of Coke Breeze Segregation in Sintering Bed under High Pisolite Ore Ratio

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