Wetting and Penetration Behavior of Calcium Ferrite Melts to Sintered Hematite

Nakashima, Kouichi; Saito, Noritaka; Shinozaki, Shurisuke; Tanaka, Ryusuke; Maeda, Takayuki; Shimizu, Masakata; Mori, Ken-ichiro

doi:10.2355/isijinternational.44.2052

Cited by 23 publications

(19 citation statements)

References 7 publications

(8 reference statements)

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“…13,21) Literature [22][23][24] also indicates that the proper sintering conditions for calcium ferrite formation are treatment of up to 3 minutes at 1 200-1 300°C. Figure 2 shows the temperature profiles in the upper (100 mm), middle (300 mm) and lower (500 mm) layers of the bed in a sinter pot with Ø 200 mm and 700 mm height.…”

Section: Sintering Regimementioning

confidence: 99%

“…Other researchers 12,13,18) have carried out basic sintering experiments using grinded ores of − 0.125 mm. In order to be able to compare the results, the ores and lime used in the assimilation and melt fluidity tests were also grinded to − 0.125 mm in a vibration mill.…”

Section: Assimilation Characteristics and Melt Fluidity 221 Materimentioning

confidence: 99%

“…13,15) Other components have shown different effects. 26) In the current study, the phase diagrams of Fe 2 O 3 -CaOSiO 2 system corresponding to the compositions of the three coarse-grain and low-grade ores were produced using FactSage™ 7.0, and the effect of ore gangue content on liquid phase at a temperature of 1 200-1 350°C was investigated.…”

Section: Effect Of Gangue On Liquid Formationmentioning

confidence: 99%

“…6,12,13) It is therefore important to maintain an optimum size distribution and sinter mix composition for a balance of strong bonding and appropriate sinter permeability. [14][15][16] In this paper, the relationship between the gangue content and amount and fluidity of liquid phase formed during sintering of three coarse-grained, low-grade ores is discussed.…”

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Effect of Coarse-grain and Low-grade Iron Ores on Sinter Properties

et al. 2017

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Section: Sintering Regimementioning

confidence: 99%

Section: Assimilation Characteristics and Melt Fluidity 221 Materimentioning

confidence: 99%

Section: Effect Of Gangue On Liquid Formationmentioning

confidence: 99%

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Effect of Coarse-grain and Low-grade Iron Ores on Sinter Properties

et al. 2017

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“…Nakashima et al 1) has studied the wetting behavior of CF slag with sintered hematite. They concluded that the wettability of a CF-based slag on a sintered hematite substrate can be improved by adding Al 2 O 3 , and that the spreading rate increases with increasing η/γ (viscosity/surface tension).…”

Section: Introductionmentioning

confidence: 99%

Wetting Behavior of Al<sub>2</sub>O<sub>3</sub> Substrate by Calcium Ferrite Series Melts

Xiang

et al. 2015

ISIJ Int.

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Calcium ferrite (CF) is the adhesive phase formed in high-basicity sinter. The wettability of CF with other solid phases plays an important role in assimilation process. In this study, an improved sessile drop technique was used to explore the wettability of a CF series slag, in which constant contents of Al2O3, MgO, SiO2, and TiO2 were added, with solid Al2O3 substrate at 1 250°C. The interfacial structure and spreading mechanisms were also discussed. The dissolution of Al2O3 into the slag was found to be the driving force of the wetting process. The CF series slag could rapidly spread after melting until a low apparent contact angle of approximately 10°-20° was attained. The spreading time positively correlated with the dissolution amount. The addition of MgO, SiO2, and TiO2 improved the wettability of CF on Al2O3 and decreased the surface tension of CF melt. After cooling, a three-layer structure was formed in the slag phase.

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Effect of Alumina on Liquid Phase Formation in Sintering Process of Iron Ore Fines

Guo

2019

steel research int.

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The formation of liquid phase is of great significance for improving the quality of high basicity sinter which is widely used as raw materials in blast furnace ironmaking. As an important component of gangue in iron ore, alumina affects the amount of liquid phase by influencing the formation of calcium ferrites-bonding phase. In this work, the hematite solid solution with aluminum (H ss ) was prepared and sintered with CaO to investigate the effect of alumina on liquid phase formation in sintering process of iron ore fines. Three homogeneous phases of CaFe 2 O 4 (CF), Ca 2 Fe 15.57 O 25.56 (CF 3.9 ), and Ca 3.18 Fe 15.48 Al 1.34 O 28 (CFA) are prepared to determine the melting temperature by using DSC method. XRD, SEM-EDS, and optical microscope are used to characterize the change of mineral and microstructure of sintered samples. The results show that an Fe-rich calcium ferrite CF 3.9 is produced above 1200 C in Fe 2 O 3 -CaO binary system. The liquid phase formation temperature can be reduced to 1206 C when CF 3.9 and CF coexist. The ternary calcium ferrite CFA, which has a eutectic temperature of 1201 C with CF, is generated above 990 C in Fe 2 O 3 -CaO-Al 2 O 3 ternary system. The formation of liquid phase is promoted by adding alumina in moderation through changing the mass ratio of CF to CFA, and the largest amount of liquid phase is produced when the ratio is 8:2.

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Wetting and Penetration Behavior of Calcium Ferrite Melts to Sintered Hematite

Cited by 23 publications

References 7 publications

Effect of Coarse-grain and Low-grade Iron Ores on Sinter Properties

Effect of Coarse-grain and Low-grade Iron Ores on Sinter Properties

Wetting Behavior of Al<sub>2</sub>O<sub>3</sub> Substrate by Calcium Ferrite Series Melts

Effect of Alumina on Liquid Phase Formation in Sintering Process of Iron Ore Fines

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