Improvement in the permeability of sintering beds by drying treatment after granulating sinter raw materials containing concentrates

Zhou, Hao; Lai, Zhenyu; Lv, Laiquan; Fang, Hao; Meng, Hanxiao; Zhou, Mingxi; Cen, Kefa

doi:10.1016/j.apt.2020.06.017

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…In the actual production, the proportions of the fraction with a size less than 3mm and the fraction with a size less than 1mm are usually important reference indicators. Too high a proportion of small-sized particles in the mixture may destroy the air permeability of sintering bed and deteriorate the production index, which is a problem to be solved in iron ore granulation [53][54][55] .…”

Section: 21: Mixture Size Distributionmentioning

confidence: 99%

“…Using DEM model, Soda et al also demonstrated that occupation ratio and mixture retention time decreased active CaO promotes liquid phase condensation and fuel combustion 91) , helping to maintain triple synchronization of heat peak, flame peak and liquid phase condensation peak in sintering bed. The addition of hydrated lime can also directly improve the strength of granules and help improve the granulation performance, and desirable granulation results were achieved with granules drying treatment by adding 2% hydrated lime 92) .…”

Section: 21: MIX Occupied Ratio In Granulation Mixermentioning

confidence: 99%

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Iron Ore Granulation for Sinter Production: Developments, Progress, and Challenges

et al. 2023

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Iron ore granulation is an indispensable process in the production of sinter that can influence and regulate the yield, efficiency and quality. Although a great deal of research has been done on the granulation process over the past decades, we still need to think about the current and future development of this process, as sinter is still an essential raw material for ironmaking blast furnace today. This paper begins with a review of particle agglomeration theory development for sintering granulation, followed by a summary of existing granulation evaluation methods and indexes. The roles of iron ore, fuel, fluxes, and moisture in sintering granulation are also analyzed, and finally advanced granulation equipment and processes for industrial production, as well as their applications, are summarized. Correspondingly, the challenges in sintering granulation field are proposed to include: (1) Development of iron ore sintering industry; (2) Ore blending optimization based on synergistic coupling of granulation and sintering; (3) Optimization of granulation process and equipment; (4) Methods and tools for granulation scientific research. These issues will be tackled and overcome in the future by both steel enterprises and academic researchers, generating suggestions for future development in the field of sintering granulation.

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Section: 21: Mixture Size Distributionmentioning

confidence: 99%

Section: 21: MIX Occupied Ratio In Granulation Mixermentioning

confidence: 99%

Iron Ore Granulation for Sinter Production: Developments, Progress, and Challenges

et al. 2023

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“…Also, at higher temperature some magnetite structures were formed which were also responsible for lower RDI [18]. During trials with lower amount of ultra-fines, few dendritic SFCA and silicate melt were formed due to high bed permeability and lower sintering time [19,20]. Formation of dendritic SFCA was observed above 1200°C and size range between 1 and 4 µm.…”

Section: Rdi and Return Fines Of Different Sets Of Experimentsmentioning

confidence: 99%

Utilization of micro-fines in sinter making and its implications on bed permeability and sinter quality

Biswas

Swarnakar

Majumder

2023

Ironmaking & Steelmaking

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Exploiting low-grade resources and raw material fines is a challenge for metallurgists developing new technologies. Iron-bearing and carbonaceous by-products are generated by ironmaking and steelmaking units and fed into the sinter plant. These by-products, which have varying proportions of ultra-fines, balling properties, moisture retention capacities, and so on, have a significant impact on sinter quality when used in sinter green mixtures. This study investigates the use of micro-fines and how it affects sinter quality while keeping operational factors such as moisture addition, balling index, and bed permeability in mind. In addition, the ideal moisture addition is investigated using higher micro-fines bearing dusts/sludges of various iron-bearing materials. The presence of columnar SFCA (Silico-ferrite of Calcium and Aluminium) is revealed by microscopic examination of the sinter produced with higher micro fines and good permeability, which improves the Reduction Degradation Index. It was also demonstrated that using more micro-fines in the blend and maintaining consistent moisture addition reduced the amount of return sinter produced.

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“…A 2% burnt lime and 1.2% bentonite addition level could increase the bed permeability from 48.77 JPU to 61.42 JPU and 53.93 JPU to 64.97 JPU respectively. Meanwhile, Zhou et al [22] revealed that the 2% addition of hydrated lime can distinctly reduce granule degradation and then improve permeability from 40.45 JPU to 46.05 JPU at 7.7 wt% granulation moisture. Lv et al [23] proposed a prewetting granulation technology and found that the bed permeability of granules raised approximately 0.25 times by optimizing the amount of water on the surfaces of different particles via prewetting treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Return Fines Embedding on the Sintering Behaviour of Vanadium Titanium Magnetite Concentrates

Peng

Liu

Hua

et al. 2022

Metals

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To improve the permeability of sinter packed bed for achieving the efficient utilization of low-grade iron bearing minerals, the effect of the returned fines embedding on productivity, yield, flame front speed (FFS) in the vanadium titanium magnetite (VTM) sintering process, tumble index (TI) of sinter, and permeability of the sinter packed bed was clarified. Results indicate that the productivity, yield, flame front speed, and tumble index of the vanadium titanium magnetite sintering process are all increased to a certain extent after embedding different sizes of returned fines, and the optimal sintering indices occur when the particle size of return fines for embedding is 3~5 mm. The optimal mass ratio of return fines for embedding was confirmed at 80%, and a continued increase in the mass ratio results in a decrease in flame front speed, yield, productivity, and tumble strength. Among the five different possible locations of embedded return fine layer, the middle-lower layer corresponds to the highest flame front speed. As the mass ratio of return fines for embedding is enhanced from 0% to 50%, the permeability of the sinter packed bed is improved at each stage of sintering.

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Improvement in the permeability of sintering beds by drying treatment after granulating sinter raw materials containing concentrates

Cited by 13 publications

References 25 publications

Iron Ore Granulation for Sinter Production: Developments, Progress, and Challenges

Iron Ore Granulation for Sinter Production: Developments, Progress, and Challenges

Utilization of micro-fines in sinter making and its implications on bed permeability and sinter quality

Effect of Return Fines Embedding on the Sintering Behaviour of Vanadium Titanium Magnetite Concentrates

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