Influence of CaO/SiO&lt;sub&gt;2&lt;/sub&gt; on the Reduction Behavior of Sintered Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;–CaO–SiO&lt;sub&gt;2&lt;/sub&gt;–Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Tablets at the Softening and Melting Temperatures

Kato, Kengo; Konishi, Hisatoshi; Ono, Hideki; Fujimoto, Shinji

doi:10.2355/isijinternational.isijint-2019-814

Cited by 6 publications

(6 citation statements)

References 15 publications

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“…Therefore, in determining the reduction rate of the sinter, the influence of the microstructure on the diffusion of the reducing gas is more significant than that of the ICR due to the formation of the SFCA phase. Kato et al [24] and Harvey et al [25] have also reported that the microstructure is a more important influencing factor than the iron oxide reactivity in sinter reduction. The GMT rate constants (R.D > 33% region) were derived from the results of this experiment, and the results of the porosity analysis on the sample prior to reduction are shown in Figure 10.…”

Section: Influence Of Al2o3 On the Metastable Samplementioning

confidence: 99%

A Study on the Effect of Alumina on the Morphology and Reduction Behavior of Sinter by In Situ Observation

Shin

Kim

Min

2021

Metals

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The effects of Al2O3 content on the morphology and reducibility of sinter were respectively investigated using confocal laser microscopy and thermogravimetric analysis at 1273 K under CO gas. To understand the effects of the sintering process, separate samples were prepared via the equilibrium and metastable reaction routes. In the equilibrium samples, the addition of Al2O3 led to the formation of the silico-ferrite of calcium and alumino phase and a decrease in the reduction rate due to the lowered reactivity of iron oxide. In contrast, in the metastable samples, the reduction rate increased after the addition of 2.5 mass% Al2O3. The addition of Al2O3 decreased the fraction of the liquid phase and increased the fraction of pores in the sample. As a result, the reduction rate is proportional to the Al2O3 content owing to the changes in the sinter morphology. In determining the reduction rate of the sinter, the influence of the microstructure on the diffusion of the reducing gas is more significant than that of the interfacial chemical reaction due to the formation of the SFCA phase. The microstructure changes of the sinter with the addition of Al2O3 and the corresponding reduction behaviors are further discussed.

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Section: Influence Of Al2o3 On the Metastable Samplementioning

confidence: 99%

A Study on the Effect of Alumina on the Morphology and Reduction Behavior of Sinter by In Situ Observation

Shin

Kim

Min

2021

Metals

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“…), depending on the cooling rate. Most of the sinter quality (reducibility and degradation degree) was affected by the amount and shape of SFCA [35,[40][41][42][43][44][45][46][47]. As the cooling rate increased, the fractions of columnar and platy type (SFCA, SFCA-I) increased [39].…”

Section: Phase Analysis Of Iron Ore Sintermentioning

confidence: 99%

A Short Review of the Effect of Iron Ore Selection on Mineral Phases of Iron Ore Sinter

2021

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The sintering process is a thermal agglomeration process, and it is accompanied by chemical reactions. In this process, a mixture of iron ore fines, flux, and coal particles is heated to about 1300 °C–1480 °C in a sinter bed. The strength and reducibility properties of iron ore sinter are obtained by liquid phase sintering. The silico-ferrite of calcium and aluminum (SFCA) is the main bonding phase found in modern iron ore sinters. Since the physicochemical and crystallographic properties of the SFCA are affected by the chemical composition and mineral phases of iron ores, a crystallographic understanding of iron ores and sintered ore is important to enhance the quality of iron ore sinter. Scrap and by-products from steel mills are expected to be used in the iron ore sintering process as recyclable resources, and in such a case, the crystallographic properties of iron ore sinter will be affected using these materials. The objective of this paper is to present a short review on research related to mineral phases and structural properties of iron ore and sintered ore.

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“…3 g of the mixed powder samples were pressed into tablet shape with 15 mm inner diameter die, and they were sintered at 1 270°C for 5 min under air atmosphere. 11) The sintered tablet samples, 14 mm diameter and 6 mm height, were treated under reducing gas atmosphere for preparation of pre-reduced samples in 2 levels of different reduction degree. The pre-reduction degree of pellets were prepared to about 30% (low prereduction degree) and about 60% (high pre-reduction degree) with CO:CO 2 :N 2 = 1:1:2 at 900°C for 60 min and CO:CO 2 :N 2 = 1:0:1 at 1 000°C for 30 min, respectively.…”

Section: Experimental Samplesmentioning

confidence: 99%

Effect of Pre-reduction Degree on Softening Behavior of Simulant Sinter Iron Ore

et al. 2020

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Reduction test under load is normally applied to evaluate softening and melting behaviour of ferrous burdens at simulated condition in cohesive zone in blast furnace. Outcomes from this test are very complex because they depend on reduction degree, chemical composition, basicity, melts physical property, etc. One of the reasons to make complex this test is sample for the test provided as particle packed bed. In order to comprehend softening and melting behaviour of cohesive zone, focus on behaviour of single particle as a component of particle packed bed in this study. For simplification, a pre-reduced simulant sinter iron ore was prepared as single tablet sample. The samples were made from mixture of reagent oxides and they were pre-reduced to control their reduction degree to several reduction levels. The tablet sample was rapidly heated up to 900°C, and then gradually heated up with 10°C/min under inert gas atmosphere and 0.1 MPa load. Shrinkage degree of the sample was measured during the softening and melting test, and quenched sample was made at certain temperature when the sample shows a characteristic tendency. Cross-sectioning observation of the quenched sample provided mineral phases distribution in the tablet sample. The observation indicated that peripheral structure has a significant effect on deformation resistance. Especially in there, existence of molten slag phase could make easy to deform the sample particle shape, and metallic solid Fe phase helped to strengthen the particle's deformation resistance.

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Influence of CaO/SiO<sub>2</sub> on the Reduction Behavior of Sintered Fe<sub>2</sub>O<sub>3</sub>–CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Tablets at the Softening and Melting Temperatures

Cited by 6 publications

References 15 publications

A Study on the Effect of Alumina on the Morphology and Reduction Behavior of Sinter by In Situ Observation

A Study on the Effect of Alumina on the Morphology and Reduction Behavior of Sinter by In Situ Observation

A Short Review of the Effect of Iron Ore Selection on Mineral Phases of Iron Ore Sinter

Effect of Pre-reduction Degree on Softening Behavior of Simulant Sinter Iron Ore

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