Effect of Micro-particles in Iron Ore on the Granule Growth and Strength

Kawachi, Shinji; Kasama, Shunji

doi:10.2355/isijinternational.51.1057

Cited by 19 publications

(7 citation statements)

References 9 publications

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“…For example, with the large amount of SiO 2 present in the iron ore, the pellet structure can be more rigid and stronger due to the stronger SiO 2 -bentonite interaction and the existence of hard SiO 2 in the structure. This point was reported previously by mechanical strength testing [8,9], and was complemented by the present work that studied the particle interaction aspect in detail by surface charge analysis. On the other hand, less amount of SiO 2 in the iron ore is requested for a blast furnace feed in terms of composition; but can lead loosely bound and weak pellets due to the weak interaction between Fe 2 O 3 and bentonite and fragile fine hematite presence with less structural support from SiO 2 .…”

Section: Zeta Potentialsupporting

confidence: 77%

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Zeta potential of inorganic fine particle—Na‐bentonite binder mixture systems

Otsuki

Hayagan

2020

Electrophoresis

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The zeta potential of single and multi‐inorganic fine particle mixtures (hematite and gangues, i.e., SiO2 + Al2O3) with Na‐bentonite was investigated to understand and properly control the mineral surface properties relevant to pelletization of low‐grade fine iron ores. The zeta potential of hematite‐bentonite mixture showed more negative charge up to 1 wt.% bentonite dosage and became constant. In the multiparticle mixture systems with bentonite, the SiO2 amount in the system controlled the changes in zeta potential due to its high negative charge (−54.9 mV at natural pH) and the bentonite attachment on its surface based on the electrostatic interaction while Al2O3 had no effect due to its negligible surface charge (−1.6 mV at natural pH). This article reports the new insight into the characterization of surface chemistry of inorganic/mineral mixture systems to understand their surface charge properties in relation to fine mineral particle processing, and to show a direction toward the elucidation of particle dispersion/aggregation mechanism in complex ore systems aiming for their beneficiations.

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Section: Zeta Potentialsupporting

confidence: 77%

“…Maeda et al [8] and Kawachi and Kasama [9] reported the importance of gangue minerals on the pellet compressive strength. For example, Maeda et al [8] observed noticeable difference in the dry compressive strength for the pellets produced with two different hematite ores hosting different gangue contents (SiO 2 wt.%, Al 2 O 3 wt.%).…”

Section: Introductionmentioning

confidence: 99%

Zeta potential of inorganic fine particle—Na‐bentonite binder mixture systems

Otsuki

Hayagan

2020

Electrophoresis

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“…It supports the selective granulation process 11) and standsupport sintering. 12) During the tests, binder 13) was used in the selective granulation line, and the stand-support function was reinforced by enhancing the effective height of the stand, to improve the permeability of the sintering bed. In addition, the blending ratio of brucite, the penetration length of ores, 14) and the bed height were increased to improve the melt properties during sintering.…”

Section: Manufacturing the Low-slag Sintered Oresmentioning

confidence: 99%

Reducing Slag Volume at Cohesive Zone of Blast Furnace by using Low-slag Sintered Ore with Reducible Magnetite

et al. 2022

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Lowering the reducing agent rate (RAR) of blast furnaces (BFs) is an effective way to mitigate CO 2 emissions in the steel industry. It is well known that low-slag sintered ores can be effective at lowering the RAR. Therefore, in this study, we focused on the manufacturing technologies of low-slag high-FeO sintered ores. High-temperature sintering was used to maintain enough strength before and during the reduction, resulting in the chemical composition of sintered ores with a T.Fe above 60 mass% and an FeO content above 8 mass%. Improvement in the permeability of the sintering bed and the melt properties were the main challenges. Stand-support sintering, selective granulation, and binder use are essential for improving the permeability. The use of brucite and reducing the Al 2 O 3 content of ores while designing their penetration length are essential for improving the melt properties as well. We implemented all of these measures in plant trials, and low-slag high-FeO sintered ores were successfully manufactured. The sintered ores exhibited a low slag volume in the cohesive zone, resulting in a lower RAR of the BF both in the offline simulator and actual plant operation. The sintered ores differed from other low-slag sintered ores manufactured previously in two aspects; large numbers of both small-sized magnetite grains and voids between grains. The reducibility of magnetite was superior to that of hematite with CaO doping, whereas MgO doping had the opposite effect. These behaviors of magnetite may explain the high reducibility of the manufactured low-slag high-FeO sintered ores.

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“…The direct reducibility and intensity of high-basicity sinter, which is the main raw material for blast furnace ironmaking, markedly influence the production efficiency of ironmaking [4,5]. The combustion characteristic of fuel in sintering mixture materials plays a decisive role in sinter quality [6,7]. Therefore, it is urgent to explore the combustion characteristics of solid fuel in the sintering process in order to provide a theoretical basis for improving the combustion efficiency, improving the quality of sinter and reducing the consumption of solid fuel [8].…”

Section: Introductionmentioning

confidence: 99%

Combustion Kinetics Characteristics of Solid Fuel in the Sintering Process

et al. 2020

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In order to systematically elucidate the combustion performance of fuel during sintering, this paper explores the influence of three factors, namely coal substitution for coke, quasi-particle structure and the coupling effect with reduction and oxidation of iron oxide, on fuel combustion characteristics, and carries out the kinetic calculation of monomer blended fuel (MBF) and quasi-granular fuel (QPF). The results show that replacing coke powder with anthracite can accelerate the whole combustion process. MBF and QPF are more consistent with the combustion law of the double-parallel random pore model. Although the quasi-particle structure increases the apparent activation energy of fuel combustion, it can also produce a heat storage effect on fuel particles, improve their combustion performance, and reduce the adverse effect of diffusion on the reaction process. In the early stage of reaction, the coupling between combustion of volatiles and reduction of iron oxide is obvious. The oxidation of iron oxide will occur again when the combustion reaction of fuel is weakened.

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Effect of Micro-particles in Iron Ore on the Granule Growth and Strength

Cited by 19 publications

References 9 publications

Zeta potential of inorganic fine particle—Na‐bentonite binder mixture systems

Zeta potential of inorganic fine particle—Na‐bentonite binder mixture systems

Reducing Slag Volume at Cohesive Zone of Blast Furnace by using Low-slag Sintered Ore with Reducible Magnetite

Combustion Kinetics Characteristics of Solid Fuel in the Sintering Process

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