Effect of Flame Front Speed on Sinter Structure of High Alumina Iron Ores

Choudhary, Manoj K.; Nandy, Bikash

doi:10.2355/isijinternational.46.611

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…They have been adopted by many investigators. Choudhary and Nandy [22] studied the sinter structure with high-alumina ores at different flame front speeds. Loo and Dukino [11] obtained the maximum temperature, flame front thickness, and residence time using embedded thermocouples in a sintering bed.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of combustion zone and evolution of mineral phases along bed height in ore sintering

Wang

Zhang

Liu

et al. 2017

Int J Miner Metall Mater

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Quantitative parameters of bed combustion, including the thickness of the combustion zone (TCZ), the maximum temperature of the combustion zone (MTCZ), and the bed shrinkage, were characterized through a series of sinter pot tests in transparent quartz pots. The results showed that TCZ first ascended and then descended as the sintering process proceeded. The sintering process was divided into four stages according to the variation rate of the TCZ. A "relative-coordinate" method was developed to obtain the actual reaction temperature of sinter along the height direction. With increasing the sintering temperature, the reactants transformed and entered into liquid phases. The mineral composition and microstructure of the sinter were characterized through X-ray diffraction and scanning electron microscopy-energy-dispersive X-ray spectroscopy. Liquid phases with greater Fe and Al contents were more likely to form acicular-like silico-ferrite of calcium and aluminum after crystallization because of the outward spread of Al, which led to a better fluidity of the liquid. An evolution mechanism of "solid-state reaction-liquid phases formation-crystallization" of the mineral phases is proposed.

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Section: Introductionmentioning

confidence: 99%

Characteristics of combustion zone and evolution of mineral phases along bed height in ore sintering

Wang

Zhang

Liu

et al. 2017

Int J Miner Metall Mater

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“…The movement of the flame front through the bed height is one of the key process parameters that affects the formation and stabilisation of phases in the sinter. The rate of travel of the flame front affects both productivity and quality 10…”

Section: Resultsmentioning

confidence: 99%

Optimisation of FeO in iron ore sinter at JSW Steel Limited

Umadevi¹,

Karthik

Mahapatra

et al. 2012

Ironmaking & Steelmaking

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Coke breeze is the most common fuel used in sintering, and its usage depends on the alumina content and fineness of the sinter mix. The coke breeze consumption in the JSW Steel Limited sinter plant was high compared to many other sinter plants in the world, and as there was a local shortage, optimisation in the sinter plants was necessary. FeO is an indicator of the thermal state of the sintering process and is employed as a quality control tool at many plants. Laboratory pot sinters were made, and the variation in FeO was affected by varying the amount of coke breeze in the green mix from 55 to 85 kg t 21 of sinter. The produced sinters were evaluated with respect to productivity, strength (tumbler index), reduction degradation index (RDI), reducibility and microstructural phases in the FeO range between 6?2 and 14?8%. It was found that the sinter with FeO range of 8?60-9?88% showed higher productivity and higher strength with desired RDI of (27% and reducibility of .60%. Analysis of plant data has revealed that the sinter with FeO of 8?5-10?0% showed higher productivity, higher strength and lower RDI.

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“…These features were influenced by the properties of the melt and the temperature profile during the sintering process. [ 14 ] The application of these algorithms was demonstrated based on five sinter samples (A, B, C, D, E). The analyses of the pore size distribution were done by scanning the entire section using the MosaiX function of the Zeiss AxioVision software.…”

Section: Methodsmentioning

confidence: 99%

Extended Analyses of Iron Ore Sinter by Image Processing

Bückner¹,

Mali

2020

steel research int.

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The iron ore sinter quality is described by various parameters. The mineralogical and textural characteristics are obtained by image processing from microimages of polished sections. The image processing software VisuMet is adapted to analyze the mineral abundance and porosity of iron ore sinter. New algorithms are developed to calculate microstructural characteristics, like the pore size distribution and the effective thickness of sinter grains. The validation of the method using image processing is given by the description of three test series to estimate the systematic and analytical errors. The application to five industrial sinter samples is outlined. Ninety percent of all pores are smaller than 250 μm in equivalent diameter and the mean equivalent diameter ranges from 76 to 79 μm. The effective thickness, which is defined as the maximum distance between solid and nonsolid sinter material, varies between 120 and 368 μm. The area degradation algorithm of VisuMet is used to calculate the gradient between 30% and 80% of the degraded area. Dense sinter grains have a lower gradient than porous ones.

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Effect of Flame Front Speed on Sinter Structure of High Alumina Iron Ores

Cited by 8 publications

References 4 publications

Characteristics of combustion zone and evolution of mineral phases along bed height in ore sintering

Characteristics of combustion zone and evolution of mineral phases along bed height in ore sintering

Optimisation of FeO in iron ore sinter at JSW Steel Limited

Extended Analyses of Iron Ore Sinter by Image Processing

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