Reaction Model and Reduction Behavior of Carbon Iron Ore Composite in Blast Furnace

Ueda, Shigeru; Yanagiya, Kazunari; Watanabe, Kentaro; Murakami, Taichi; Inoue, Ryo; Ariyama, Tatsuro

doi:10.2355/isijinternational.49.827

Cited by 55 publications

(45 citation statements)

References 8 publications

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“…The apparatus is same to previous study, 10) therefore, that is briefly mentioned here. An electric resistance furnace connected to a proportional-integral-derivative (PID) controller with a thermocouple was used for the measurement.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Improvement of Reactivity of Carbon Iron Ore Composite with Biomass Char for Blast Furnace

et al. 2009

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Enhancement of reactivity of the burden in the blast furnace can decrease the reducing agent of blast furnace. Besides high reactivity coke, the carbon iron ore composite is considered to be a typical high reactivity burden that can control the thermal reserve zone temperature. Since the reactivity of biomass char is much higher than that of coke, the use of carbon iron ore composite with biomass char will be favorable for decreasing the reducing agent. In the present study the reaction and reducing behavior of the carbon iron ore composite with biomass char were investigated. The gasification rate of biomass char was measured in CO 2 atmosphere, and the reaction rate equation of that was derived. The microscopic structure change of biomass during carbonization was experimentally analyzed. According to the experimental results, the reduction of the composite begins at about 550°C in an inert gas atmosphere, and it is much lower than the composite with coke. Analysis of the reaction of carbon iron ore composite was carried out with the reaction model of the carbon iron ore composite based on a lumped system, in which the reaction rate of biomass char and iron ore were installed. The reaction model shows that the biomass char can improve the reduction behavior of the carbon iron ore composite especially in the lower temperature region. Moreover, the influence of gas atmosphere and the optimum structure of the composite were investigated by the model calculation to estimate the optimum condition of the composite in the blast furnace.KEY WORDS: biomass char; carbon iron ore composite; mathematical model; carbon gasification; blast furnace; carbon dioxide; ironmaking. 1505© 2009 ISIJ used as reducing agent in the composite. Decomposition temperature ranges of cellulose and hemicellulose are from 250 to 400°C and from 180 to 300°C, respectively. 13) If biomass is carbonized in over the temperature ranges, the structure of cellulose would be decomposed and the grind ability of that would be improved. In the present study, carbonization of biomass over 400°C in an inert gas was employed as the pretreatment method of biomass char. Carbonization of BiomassCarbonization of biomass was carried out over 400°C at an inert gas, namely Ar atmosphere. Lumber of Japanese cedar was used as a biomass. That was cut into a piece of 10 mmϫ10 mmϫ50 mm. In order to consider of heat pattern for carbonization, two initial conditions for heating were employed, (1) Hot start condition; the biomass was charged into heated furnace at the specified temperature, and (2) Cold start condition; after charging the biomass into the furnace, the sample heated with increasing temperature at a rate of 0.167°C/s. For both condition, after reaching the specified temperature, the biomass was kept in the furnace for 7 200 s.The composition of raw biomass used in the present experiment and biomass chars carbonized in various temperatures were listed in Table 1. Concentration of C, H and N in organic substance, and ash were analyzed and concentration of O wa...

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Section: Experimental Apparatusmentioning

confidence: 99%

Improvement of Reactivity of Carbon Iron Ore Composite with Biomass Char for Blast Furnace

et al. 2009

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“…This close contact between the reactants generally has the effect of increasing the reduction rate [1][2][3][4][5][6] . Iron ore-carbon compacts are being utilised in new ironmaking processes such as FASTMET, ITmk3 or HiQIP 7 .…”

Section: Introductionmentioning

confidence: 99%

“…The use of iron ore-carbon compacts allows the use of different iron sources such as iron ore fines, low grade iron ores 6 , plant waste 3,8 or magnetite ores 9 . The use of different carbon sources such as coal, coke 4 , biomass 10,11 and plastic waste [12][13][14] have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Strength and bonding in reduced ironsand–coal compacts

Longbottom

Monaghan

Nightingale

et al. 2013

Ironmaking & Steelmaking

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In this investigation, the strength and bonding within reduced ironsand-coal compacts were studied, with the aim of better understanding the binding mechanisms in the reduced compacts and, based on this understanding, to improve their strength. Ironsand ore and sub-bituminous coal were mixed and pressed into compacts, which were reduced by heating in a thermogravimetric furnace to temperatures between 1273 and 1573 K under argon. The progress of the reaction was monitored by measuring the weight loss with time. The reduced compacts were found to have low strength in compression testing. The main form of bonding between the reduced ironsand particles in the compact was by the formation of a slag-like material. Increasing the final reduction temperature was found to have a profound effect on the strength of the compacts by promoting the formation of this slag-like material. AbstractIn this investigation the strength and bonding within reduced ironsand-coal compacts were studied. The aim of the study was to better understand the binding mechanisms in the reduced compacts and, based on this understanding, to improve on their strength.Ironsand ore and sub-bituminous coal were mixed and pressed into compacts which were reduced by heating in a thermogravimetric furnace (TGA) to temperatures between 1273-1573K under argon. The progress of the reaction was monitored by measuring the weight loss with time. The reduced compacts were found to have low strength in compression testing. The main form of bonding between the reduced ironsand particles in the compact was by the formation of a slag-like material. Increasing the final reduction temperature was found to have a profound effect on the strength of the compacts by promoting the formation of this slag-like material.

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“…Reduction of iron oxides by solid reductants has also been studied, especially when developing the self reducing iron oxide and carbon composite briquettes. [20][21][22][23][24][25][26][27][28] These studies, with different iron oxides and carbon bearing materials, have shown that the self reduction mechanism and kinetics are more complicated because beside the reaction of reduction it includes sensibly endothermic carbon gasification reaction which very often is found to control the overall rate of self reduction. Moreover, other phenomena could influence 28) (like a devolatilization of the reducing agent) or even control 24) (like a heat transfer) the rate of self reduction.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Reduction Behavior of Mill Scale

et al. 2011

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This paper presents an initial part of a project devoted to the recycling of mill scale in the form of selfreducing briquettes. First chemical and morphological characteristics of mill scale were investigated and next its gaseous reduction behavior was studied by thermogravimetry. The chemical characterization showed that wustite is the major constituent of this waste matter, with small amounts of magnetite, hematite and metallic iron. The microscopic examination of the scale revealed its complex and layered microstructure with three distinct zones. The outer layer is relatively thin and porous. It is mainly composed of hematite and magnetite. The intermediate layer is made of the dense, columnar grains of wustite. The inner layer is a very porous wustite. The gaseous reduction by carbon monoxide has a topochemical character regardless of initial morphology of scale and, depending on temperature and reducing gas composition it produces a porous iron or the iron whiskers. The unreacted shrinking core model with one interface fits quite well the kinetic data and the activation energy of reduction is about 80 kJ/mol.

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Reaction Model and Reduction Behavior of Carbon Iron Ore Composite in Blast Furnace

Cited by 55 publications

References 8 publications

Improvement of Reactivity of Carbon Iron Ore Composite with Biomass Char for Blast Furnace

Improvement of Reactivity of Carbon Iron Ore Composite with Biomass Char for Blast Furnace

Strength and bonding in reduced ironsand–coal compacts

Characterization and Reduction Behavior of Mill Scale

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