Review on the Phase Equilibria in Iron Ore Sinters

Heikkinen, Eetu‐Pekka; Iljana, Mikko; Fabritius, Timo

doi:10.2355/isijinternational.isijint-2020-224

Cited by 12 publications

(6 citation statements)

References 137 publications

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“…high-iron SFCA and low-iron SFCA. [38][39][40][41][42] The former possesses relatively higher mechanical strength and lower formation temperature compared with the latter. Thus, the more formation of high-iron SFCA is more beneficial to the improvement of sinter strength.…”

Section: Strength Of Bonding Matrixmentioning

confidence: 99%

Distinct Difference in High-temperature Characteristics between Limonitic Nickel Laterite and Ordinary Limonite

et al. 2022

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In order to achieve the effective utilization of limonitic nickel laterite for stainless steel production at lower cost, the distinct difference in high-temperature characteristics between limonitic nickel laterite and ordinary limonite has been systematically expounded via compact sintering method and the comparative analysis of the relevant sintering performance at the suitable basicity has also been conducted through sinter pot tests. The results indicate that limonitic nickel laterite possesses much poorer assimilability and liquid phase fluidity due to the abundant high-smelting minerals compared with ordinary limonite. The strength of bonding matrix of limonitic nickel laterite is relatively better as the basicity is not exceed 1.4 while that of ordinary limonite is maintained at a higher level with the basicity of no less than 1.8. Meanwhile, the former is far weaker than the latter due to the much less amount of liquid phase, rather higher porosity and looser microstructure of the bonding matrix. Limonitic nickel laterite is identified as a far more refractory ore for sintering compared with ordinary limonite, further supported by sinter pot tests. It is essential to strengthen limonitic nickel laterite sintering from the standpoints of how to promote the liquid phase formation and densification of the sinter.

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Section: Strength Of Bonding Matrixmentioning

confidence: 99%

Distinct Difference in High-temperature Characteristics between Limonitic Nickel Laterite and Ordinary Limonite

et al. 2022

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“…In industrial sinters, SFCA has a wide variation of chemical compositions [6,15,17,[57][58][59][60][61]. It is useful to use a pseudo-quaternary phase diagram, generally termed as "CCC plane" (Figure 7), to describe a stable composition range for SFCA [17,[58][59][60]62].…”

Section: Chemical Composition Of Sfcamentioning

confidence: 99%

“…In most Asian countries, iron ore sinters used in ironmaking are produced by mixing iron ores originating from different deposits around the world, such as those in Australia, Brazil, China, and India [1]. During the sintering process, iron ore, flux, and coal particles are mixed together and heated to about 1300 • C-1480 • C in a sinter bed [2][3][4][5][6]. The strength of the iron ore sinter is obtained by calcium ferrite liquid phase sintering.…”

Section: Introductionmentioning

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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“…The quality of the sinter is of great importance to ironmaking. Improving the quality of the sinter not only ensures smooth operation of the blast furnace but also reduces the fuel ratio and increases the molten iron yield, 1,2) and the quality of the sinter is closely related to the structural characteristics of the pores and minerals in the sinter. 3,4) The compositions and microstructures of the mineral phases in sinters are mainly influenced by their bulk chemical composition and sintering process parameters.…”

Section: Introductionmentioning

confidence: 99%

Mineralization Characteristics of Iron Ore Sinter and the Effects of Cooling Rate on Mineral Phase Structure

et al. 2023

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The mineral phase composition and structure of sintered ore are closely related to its quality. Analyzing the characteristics of the phase structure of sintered ores and studying the influence of sintering conditions are important to optimize their quality. In this study, the mineralization characteristics of ore during the sintering process were studied through interrupted quenching experiments. The results clarified the evolution of the structure of the sintered ore phases during the heating and cooling and its mechanism. In this study, the effects of the cooling rate on the mineral composition and structure of sintered ore were also studied. The results showed that the structure of the mineral phase changed during the iron ore sintering process as follows: granular → molten → dissolution texture. During the cooling process, as the temperature decreased, the magnetite and liquid phase contents gradually decreased, and the silico-ferrite of calcium and aluminum (SFCA) and hematite contents increased; however, the porosity did not change to a great extent. The formation of SFCA during the cooling stage consumed hematite and magnetite, and SFCA preferentially formed and grew on magnetite. As the cooling rate of the sinter was increased, the magnetite and silicate contents increased, and the hematite and SFCA contents decreased. Meanwhile, the structure of SFCA changed from block-like to columnar and acicular, and the aspect ratio increased.

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Review on the Phase Equilibria in Iron Ore Sinters

Cited by 12 publications

References 137 publications

Distinct Difference in High-temperature Characteristics between Limonitic Nickel Laterite and Ordinary Limonite

Distinct Difference in High-temperature Characteristics between Limonitic Nickel Laterite and Ordinary Limonite

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

Mineralization Characteristics of Iron Ore Sinter and the Effects of Cooling Rate on Mineral Phase Structure

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