Effects of Mineral Composition and Microstructure on Crack Resistance of Sintered Ore

Ying, Ziwei; Jiang, Maofa; Li-xian, XU

doi:10.1016/s1006-706x(06)60068-x

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…To further reveal the effects of SiO 2 and Al 2 O 3 on sinter quality, the mechanical strengths of different species of SFCA were examined. As shown in Figure 16, needle-like SFCA showed the highest compression strength of 1809 N, which was considerably higher than that of sheet-like SFCA, which reached 1186 N, and that of the calcium silicate, which showed the lowest compression strength of 1035 N. These results agree well with those of Loo et al and Ying et al [18,19]. Moreover, the fracture toughness and Vickers hardness of different kinds of minerals were also measured, and the results are shown in Figure 17.…”

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confidence: 89%

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Microstructure and Minerals Evolution of Iron Ore Sinter: Influence of SiO2 and Al2O3

Zhao

Gan

et al. 2019

Minerals

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SiO2 and Al2O3 are two important minerals that can affect the mechanical and metallurgical properties of sinter. This investigation systematically studied the influences of these minerals and revealed their functional mechanisms on sinter quality. Results showed that with an increasing Al2O3 content in sinter, the sintering indexes presented an improvement before the content exceeded 1.80%, while the quality decreased obviously after the content exceeded 1.80%. With an increasing SiO2 content, the sinter quality presented a decreasing tendency, especially when the content exceeded 4.80%. Consequently, the optimal content of Al2O3 was ≤1.80% and that of SiO2 was ≤4.80%. The evolution of the microstructure and minerals in sinter showed that enhancing the Al2O3 content increased the proportion of SFCA generated, which improved the sinter’s mechanical strength, while excessive Al2O3 led to the formation of sheet-like SFCA with weak mechanical strength. Increasing the content of SiO2 strained the formation of SFCA and promoted the formation of calcium silicate, the mechanical strength of which is lower than that of SFCA. The research findings will be useful in guiding practical sintering processes.

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confidence: 89%

“…which reached 1186 N, and that of the calcium silicate, which showed the lowest compression strength of 1035 N. These results agree well with those of Loo et al and Ying et al [18,19]. Moreover, the fracture toughness and Vickers hardness of different kinds of minerals were also measured, and the results are shown in Figure 17.…”

supporting

confidence: 88%

Microstructure and Minerals Evolution of Iron Ore Sinter: Influence of SiO2 and Al2O3

Zhao

Gan

et al. 2019

Minerals

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“…Silico-Ferrite of Calcium and Aluminium – SFCA) helps provide a better understanding of the metallurgical properties of iron ore sinter (e.g. Shigaki et al 1986; Loo et al 1988; Loo and Bristow 1994; Yang and Loo 1997; Ying et al 2006; Sinha and Ramna 2009; Silva et al 2016; Sinha et al 2017). The concepts of fracture toughness and fracture propagation mechanisms, derived from existing research into materials and ceramics (e.g.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the composite microhardness and fracture toughness of iron ore sinter – a phase-based approach

Peterson

2021

Mineral Processing and Extractive Metallurgy

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Microindentation testing was undertaken on sinter phases in iron ore sinter to determine the range and mean of phase/morphology microhardness. The mean fracture toughness of each sinter phase/texture was calculated from indent-associated radial cracks. A value for the composite microhardness (CH) and composite fracture toughness (CFT) was calculated for each sinter sample, based upon the modal proportion of constituent sinter phases. The CH and CFT of sinter phases and each sinter sample was compared to a range of metallurgical indices and major element chemistry to determine the extent of any correlation. Moderate to strong negative correlations were observed between sinter CH and sinter Tumble Index,

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“…Compared with the results from earlier studies [18][19][20][21][22], this work provides a new view on the determination of mechanical properties. The obtained data are difficult to compare with classical Vickers microhardness, but on the other hand, the values were obtained with an accurate method allowing for rigorous comparison with the future examination of mechanical properties of sinter phases.…”

Section: Factors Influencing the Mechanical Propertiesmentioning

confidence: 78%

“…In most cases the hardness was measured using Vickers microindentation. However, there are some elementary problems with these measurements, such as too little information about the elastic constants or insufficient size of the crystals, so that the surrounding phases influence the measurements [18][19][20][21][22]. For this reason, in this study SFCA phases were synthesized in the laboratory to attain grain sizes of tens of micrometers, for which the mechanical properties can be quantified using advanced mechanical testing such as nanoindentation.…”

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confidence: 99%

Synthesis and Mechanical Testing of Calcium Aluminosilicoferrite Crystals with High Alumina Content

Mežibrický

Csanádi

Habler

et al. 2019

Metals

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Due to the gradual shift to less rich iron ores, the alumina content in the raw materials used for iron-making is progressively increasing, affecting the mineralogy and the properties of iron ore sinters. In this context, the effect of Al content on the mechanical properties of calcium aluminosilicoferrites Ca2(Ca,Mg,Fe)6(Fe,Si,Al)6O20 (SFCA), which is the most important bonding phase in iron ore sinters, is of particular interest. In this study, high-alumina calcium aluminosilicoferrites were synthesized and their mechanical properties were determined by nanoindentation using a cube-corner indenter. For synthesis, different raw materials were taken as proxies for the adhering layer in a sinter granule. Three mixtures were prepared, high-iron, high-silica, and high-alumina and heated in an alumina crucible, which was used to simulate the high-alumina nucleus in a granule. The different raw materials used for synthesis had only minor influence on the compositions of the synthesized ferrites. All ferrites showed similar mechanical behavior during indentation, indicating that neither the chemical nor the mechanical properties were affected by the different compositions of the adhering layer, when the sinter granule is dominated by a high-alumina nucleus. The crystallographic orientation of the tested grains had only minor influence on the results of the nanoindentation experiments.

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Effects of Mineral Composition and Microstructure on Crack Resistance of Sintered Ore

Cited by 11 publications

References 3 publications

Microstructure and Minerals Evolution of Iron Ore Sinter: Influence of SiO2 and Al2O3

Microstructure and Minerals Evolution of Iron Ore Sinter: Influence of SiO2 and Al2O3

Quantifying the composite microhardness and fracture toughness of iron ore sinter – a phase-based approach

Synthesis and Mechanical Testing of Calcium Aluminosilicoferrite Crystals with High Alumina Content

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