Behaviour of iron ore–fuel oil composite pellets in isothermal and non-isothermal reduction conditions

El-Geassy, A. A.; Khedr, M.H.; Nasr, M. I.; Aly, Mohamed Shehata

doi:10.1179/030192301678091

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…So, the diffusivity of the gas as well as diffusion of carbon decreases, which leads to a decrease in rate of reduction as well as fraction of reduction. Similar results are also reported in the literature 25.…”

Section: Resultssupporting

confidence: 93%

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Smelting Reduction of Iron Ore‐Coal Composite Pellets

Sah¹,

Dutta

2010

steel research int.

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Smelting reduction of iron ore‐coal composite pellets has been carried out in an induction furnace. The pellets, tied with tungsten wire, were immersed into the liquid metal bath. The experiments were carried out in the temperature range of 1713 K to 1733 K. For 16‐18 mm diameter pellets, it was observed that (i) the time required for complete dissolution in liquid metal bath is 83‐90 seconds, (ii) the fraction of reduction for 40 seconds of immersion varied from 0.68‐0.87 for Jharia coal pellets and 0.73‐0.92 for Bhilai coal pellets, and (iii) the fraction of reduction increases with decreasing Fe/C ratio and increasing immersion period. X‐ray diffraction (XRD) of reduced pellets showed that the reduction occurred topochemically. Scanning electron microscopic (SEM) examination of partially reduced pellets evinced the structural changes in pellets. The present investigation aims to assess the effect of Fe/C ratio in pellet, volatile matter in coal, and time of pellet immersion into liquid metal bath on reduction of iron ore‐coal composite pellets.

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Section: Resultssupporting

confidence: 93%

“…Since the diffusivity of H 2 is about four times as fast as that of CO, the reduction rate at intermediate stage is faster than that of the final stage. This is also reported by El‐Geassy et al 25, and Sohn and Fruehan 26.…”

Section: Resultssupporting

confidence: 84%

Smelting Reduction of Iron Ore‐Coal Composite Pellets

Sah¹,

Dutta

2010

steel research int.

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“…A mixture of hematite (average diameter: 2.6 mm), medium density polyethylene (PE, average diameter: Ͻ250 mm, 0.94 g/cm 3 ), and graphite (average diameter: Ͻ45 mm) reagents was used for the preparation of composite samples. The amount of PE and graphite added varied from 0 to 13.0 mass% (C/Oϭ0.00, 0.10, 0.20, 0.42) and from 0 to 18.0 mass% (C/Oϭ0.00-0.97), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…1) There are a number of reports about the reduction behavior of the composite containing carbonaceous materials and iron oxide. [2][3][4][5] In contrast, approximately 10 million tons of plastic waste, mainly polyethylene (PE) and polypropylene, is annually generated in Japan. 6) Approximately 20 % of this waste is reused through material-and chemical-recycle schemes.…”

Section: Introductionmentioning

confidence: 99%

Reduction Behavior of Hematite Composite Containing Polyethylene and Graphite with Different Structures with Increasing Temperature

2009

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Figure 5 shows the changes in the partial pressure ratio of CO to COϩCO 2 , (CO)/(COϩCO 2 ), of the outlet gas with an increase in temperature drawn on the phase diagram of the Fe-O system. The uniform composites used are 10mass% PE (C/Oϭ0.42, A), 10mass% PE-2.3mass% graphite (C/Oϭ0.55, B), 5 mass% PE-6.7mass% graphite (C/Oϭ0.55, C) and 8.6mass% graphite (C/Oϭ042, D). (CO)/(COϩCO 2 ) obtained from the composites A-C with added PE begins to increase gradually at approximately 700 K. It abruptly increases at 900 K and reaches the coexistence line of magnetite and wustite at approximately 1 000 K. Then, it moves on the line with increasing temperature. All composite with added PE exhibited this behavior. This indicates that the reduction reaction of magnetite controls (CO)/(COϩCO 2 ). Figure 6 shows the microstructure of the reduced composite B containing 10 mass% PE and 2.3 mass% graphite after keeping the composite in the furnace for 650, 740, and 1 200 s at 1 100, 1 200, and 1 427 K, respectively. Two oxide phases of magnetite and wustite are observed at 1 100 K, and this agrees with the results obtained from the gas analysis. (CO)/(COϩCO 2 ) of the composite A without the added graphite rapidly decreases at approximately 1 100 K since the generation of CO and CO 2 gas caused by PE has been completed at this temperature as shown in Fig. 3(b). In contrast, (CO)/(COϩCO 2 ) of the composites B and C with added graphite is observed in the region of an FeO single phase. From the microstructure observation, it was concluded that an FeO single phase also existed at 1 200 K. After reaching the holding temperature, the ratio reaches the coexistence line of wustite and metallic iron. In the microstructure given in Fig. 6(c), metallic iron is partially observed together with wustite.On the other hand, (CO)/(COϩCO 2 ) generated from the composite D without the added PE begins to increase at approximately 1 200 K because CO gas did not generate blew this temperature as shown in Fig. 3(c). At 1 300 K, (CO)/ (COϩCO 2 ) reaches the coexistence line of magnetite and wustite. The difference of the CO gas generation behaviors between the uniform composites A-C with the added PE and D without the added PE at temperatures ranging from 1 250 to 1 400 K, described above, can be considered to be as follows. The reduction reaction of the composite A-C with added PE proceeded to the stage of an FeO single phase because the reduction of hematite and magnetite had already occurred by PE at a low temperature. In contrast, the reduction of the composite D without added PE began at approximately 1 200 K and then, FeO started to form at approximately 1 300 K. Figure 7 shows the relation between reduction degree and C/O of the uniform composite containing various amounts of PE and graphite. The reduction degrees of the composites containing 0, 2.5, 5, and 10 mass% PE increase linearly with increasing C/O values. In contrast, the addition of PE decreases the reduction degree. The contributions of PE to the C/O values of the uniform composites c...

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“…The reduction of haematite iron ore was performed at 1250°C in a laboratory scale multilayer rotary hearth furnace (RHF) at different C/ Fe 2 O 3 ratios of 1.33, 1.66, 2, 2.33, 2.66, and 3 [8]. El-Geassy et al [9] studied the reduction kinetics of iron ore with and without fuel oil (5,10,12, and 15 wt %) composite pellets at 750°C, 800°C, 850°C, 900°C, 950°C, and 1000°C under H 2 atmosphere. The effect of time and temperature on the reduction behaviour in iron ore-coal composite briquettes at 700°C, 800°C, 900°C, 1000°C, and 1100°C have been analysed by Man et al [10].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of strength of blast furnace flue dust – iron oxide – fly ash composite briquette using ANOVA-based mathematical model

Das

Mondal

Pramanik

2023

Ironmaking & Steelmaking

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Utilisation of by-products of an integrated steel plant improves productivity with diverse mix of raw materials used for iron making. The strength of a briquette made with Blast furnace flue dust and iron oxide with fly ash as a binder depends upon the briquetting pressure, particle size of fly ash, fly ash quantity, and curing temperature. In this study, the effect of process variables on the strength was investigated with ANOVA. The correlation between the process parameters and the strength was examined experimentally and RSM-based optimisation was performed during the preparation of briquettes. The RSM provided optimisation with a confidence level of 95% using the CCD design. This paper demonstrates the correlation between applied pressure, particle size, fly ash quantity, and curing temperature. The developed mathematical model would help in predicting the variation in the compressive strength with the change in the level of different parameters. This model can be useful for setting the optimum value of the parameters for achieving the target compressive strength.

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Behaviour of iron ore–fuel oil composite pellets in isothermal and non-isothermal reduction conditions

Cited by 11 publications

References 7 publications

Smelting Reduction of Iron Ore‐Coal Composite Pellets

Smelting Reduction of Iron Ore‐Coal Composite Pellets

Reduction Behavior of Hematite Composite Containing Polyethylene and Graphite with Different Structures with Increasing Temperature

Enhancement of strength of blast furnace flue dust – iron oxide – fly ash composite briquette using ANOVA-based mathematical model

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