Carburized Carbon Content of Reduced Iron and Direct Carburization in Carbon Composite Iron Ore Pellets Heated at Elevated Temperature

Iguchi, Yoshiaki; Endo, Satoshi

doi:10.2355/isijinternational.44.1991

Cited by 28 publications

(29 citation statements)

References 11 publications

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“…The relatively high activation energy values (250-350 kJ/mol) are taken as being characteristic for the Boudouard reaction control while the lower values indicate an increasing role of reduction in overall self-reduction rate control. 10,14) Accord- ing to Iguchi et al [22][23][24] the carburization of freshly reduced iron by direct carbon dissolution C(s) = [C] is another important reaction which could interfere in self-reduction, especially at the reduced pressures and high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…10,[22][23][24][25][26][27] On the other hand, the hematite and magnetite ores, synthetic wustite as well as some waste materials (EAF dust, mill scale) were used as the iron oxide bearing materials in the self-reducing mixtures and agglomerates. 10,11) In addition to the reaction rate limits, another important issue is the mechanical strength of the agglomerates during the reduction.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Gasification in Self-reducing Mixtures

et al. 2014

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Self-reduction experiments of mill scale with four potential carbonaceous reductants (charcoal, coal char, blast furnace coke and petroleum coke) were carried out by thermogravimetry (TG) in order to choose one allowing the highest reduction rate and overall conversion. The fastest rate of self-reduction was measured for the charcoal and the slowest for the petroleum coke. The Friedman method of kinetics data analysis was used to calculate apparent activation energy at different conversion rates. Based on these values it can be concluded that the Boudouard reaction controls the rate of self-reduction with charcoal up to about 60% of conversion and even more for others reductants. It has also been demonstrated that the morphology of the iron produced strongly depends on reactivity of carbonaceous reductant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon Gasification in Self-reducing Mixtures

et al. 2014

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“…On the other hand, the oxygen concentration at carbon-saturated iron melt under 1 atm of CO is calculated to be 1.21 ppm by Eqs. (5) and (6). The oxygen concentration near the interface with wüstite is supersaturated about 41 times higher than the equilibrium value with p CO of 1 atm resulting in higher oxygen gradient than that without wüstite.…”

Section: Methodsmentioning

confidence: 89%

“…Carbon composite agglomerates (CCA) have been also used for coal-based new ironmaking processes such as FASTMET and ITmk3. Many investigations [2][3][4][5][6][7][8] have been carried out to understand the reduction, carburization and melting phenomena occurring in the CCA. In a microscopic view, particles of iron oxides, metallic Fe and carbonaceous material are mixed together and contacted with each other in the DRI and CCA.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Iron Melting Rate under the Co-existence of Graphite and Wüstite

2010

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Carburization and melting processes of solid Fe under the co-existence of graphite and wüstite has been investigated based on a confocal laser scanning microscope "in-situ" observation of the movement of the interface between Fe-C melt and solid Fe at 1 523 K. In the experiments, strong stirring flow at the surface of the Fe-C melt is observed. This flow is found to be Marangoni flow and is introduced by the surface tension gradient due to the difference of oxygen concentration between the Fe-C melt interface with graphite and solid iron. The velocity of Marangoni flow is measured from the moving velocities of bubbles at the molten Fe-C surface. The melting rate of Fe is analyzed by computational fluid flow simulations of the Fe-C melt. Based on these results, it is confirmed that the carburization and melting rate of solid Fe can be enhanced by allowing Fe-C melt to come into contact with wüstite and graphite simultaneously.

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“…Much time was devoted to elucidating the carburization mechanism of the process. [11][12][13][14][15][16][17][18] Carburization degree of the reduced iron during reduction is important for accelerating the ironmaking process and reducing energy consumption. Traditionally, the carbon content of the pig iron nugget is 2.5-3.0 wt% and is 4.5-5.4 wt% for the blast furnace iron.…”

Section: Introductionmentioning

confidence: 99%

Carburization Degree of the Iron Nugget Produced by High Al<sub>2</sub>O<sub>3</sub> Iron Ore

Wang

Xue

2017

ISIJ Int.

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The reduction and melting separation experiment of iron ore containing Al 2 O 3 was performed. The results showed that Al 2 O 3 obviously affected the melting separation behaviors and the carbon content of the iron nugget. When the Al 2 O 3 content in iron ore was 4.59 wt%, the carbon content in the iron nugget was as low as 0.80 wt% and was much lower than the iron ores with lower Al 2 O 3 content, and increased with the increasing of slag basicity. The melting separation and carburiz ation mechanism of high Al 2 O 3 iron ore/ coal composite pellet was deduced.

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Carburized Carbon Content of Reduced Iron and Direct Carburization in Carbon Composite Iron Ore Pellets Heated at Elevated Temperature

Abstract: Fig. 7.Temperature dependence of the carbon content before and after ultrasonic cleaning (u.c.) for the shell part and core part of reduced iron obtained by heating Mt. Newman ore-coke char composite pellets.

Cited by 28 publications

References 11 publications

Carbon Gasification in Self-reducing Mixtures

Carbon Gasification in Self-reducing Mixtures

Enhancement of Iron Melting Rate under the Co-existence of Graphite and Wüstite

Carburization Degree of the Iron Nugget Produced by High Al<sub>2</sub>O<sub>3</sub> Iron Ore

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