Influence of Mineral Matter on Coke Reactivity with Carbon Dioxide

Grigore, Mihaela; Sakurovs, Richard; French, David; Sahajwalla, Veena

doi:10.2355/isijinternational.46.503

Cited by 108 publications

(122 citation statements)

References 17 publications

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“…Many investigations reported catalyst effect of Ca or Fe on gasification of carbon. [3][4][5][6][7] Furthermore plant trials proved that Ca-rich coke containing Ca as a catalyst could decrease reducing agent rate of blast furnace. 8) Usage of low grade iron ores as raw materials of such agglomerates is attractive to meet a lack of high grade iron ore resources.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Low-temperature Gasification and Reduction by Using Iron-coke in Laboratory Scale Tests

et al. 2011

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Iron-coke having various amount of M.Fe were produced in laboratory scale and the influence of M.Fe content in Iron-coke on reaction behavior under the condition simulating blast furnace has been investigated. Cold strength of Iron-coke products was decreased with an increase of mixing ratio of iron ore mostly due to a prevention of dilatation of coal particles by iron ore, resulting in weak bonding of coal particles. Nevertheless formed Iron-coke with iron ore in the fraction up to 30% would have enough strength for use in blast furnace as nut coke. Both CRI and JIS-reactivity were enhanced by increasing ratio of mixed iron ore, confirming the catalysis effect of M.Fe. The temperature at which carbon consumption started was lowered with an increase of T.Fe in coke. Formed Iron-coke containing 43% of T.Fe started reaction consuming its carbon at lower temperature than conventional coke by 150°C. Furthermore, consumed carbon ratio was improved by M.Fe installation to coke due to increasing gasification. Process evaluation with using Iron-coke in blast furnace was performed by BIS test. It was revealed that using formed Iron-coke having 43% of T.Fe for blast furnace resulted in an increase of shaft efficiency by 6.8%. It was found that to lower the reducing agent rate in blast furnace by decreasing the temperature of thermal reserve zone, lowering the beginning temperature of coke reaction was effective. Usage of Iron-coke having M.Fe catalyst within coke matrix is one of the methods.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Low-temperature Gasification and Reduction by Using Iron-coke in Laboratory Scale Tests

et al. 2011

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“…For zinc addition, the declining rate of CSRTCM is 1.093% for every 1% increase of CRITCM, smaller than that for K2O addition (1.498%), [12] meaning the degree of damage caused by zinc is weaker than that by potassium. According to GRIGORE [13] et al and REID et al, [14] metallic iron and minerals in crystalline phases containing Fe, Ca, K and Na in the coke ash have catalytic effects on coke gasification. Zinc is usually listed in the category of transition elements and it is thus expected also having catalytic effect on ferro-coke gasification.…”

Section: Impact Of Zinc On Starting Gasification Temperature Of Ferromentioning

confidence: 99%

Impact of Zinc on Gasification Reaction and Post-Reaction Strength of Ferro-coke

Li¹,

Wei²,

Bi³

et al. 2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Ferro-coke is an iron-containing novel kind of coke, to clarify its behavior of CO2 gasification under Zn recirculating condition in the blast furnace is very important for its practical application in BF production. In this paper, the weight loss of ferro-coke was determined with a thermogravimetric balance, the variation in exhaust gas composition at several different temperatures were measured with a gas analyzer. The results revealed that zinc has catalytic effect on CO2 gasification in respect to the decrease in starting gasification temperature and the increase of burning-off degree. And also for ferro-coke, the reactivity increased while the post-reaction strength decreased along with the zinc content increasing. Generally speaking, the impact of zinc on ferro-coke thermal properties is weaker than potassium. INTRODUCTION.

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“…13,14) Among them, ash composition and mineralogy, porosity and carbon type are most relevant to the current investigation. Each of these factors are discussed in turn.…”

Section: Reactivity Of Industrial Cokes and Coke Analoguesmentioning

confidence: 99%

Effect of Mineral Matter on the Reactivity of Coke and its Replication in a Coke Analogue

et al. 2016

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The reactivity of coke analogues doped with minerals to mimic the mineralogy of specific industrial cokes was compared with the reactivity of the industrial cokes. The reactivity was assessed in a pseudo-CRI type test. This involved reacting the carbonaceous materials (analogue and industrial coke) in CO 2 at 1 100°C in a thermos-gravimetric system. In this comparison, the mineral matter added to the coke analogue was prepared from ashing of the industrial cokes. A distinct ranking of reactivity for the industrial cokes was determined to be coke A < coke B < coke C. The high reactivity of coke C was attributed to the high iron content in its ash. The higher reactivity of coke B over coke A was attributed to its higher porosity and lower rank (of the original coal carbon type) of the industrial cokes. The coke analogue replicated the increased reactivity of coke C over cokes A and B, indicating that the coke analogue is able to some extent to replicate the effect of coke mineralogy on coke reactivity in CO 2 . The use of the coke analogue allowed assessment of the difference in the reactivities of cokes A and B. When porosity and carbon type were fixed by use of the analogue, the reactivities of the analogues of cokes A and B were found to be similar.

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Influence of Mineral Matter on Coke Reactivity with Carbon Dioxide

Cited by 108 publications

References 17 publications

Enhancement of Low-temperature Gasification and Reduction by Using Iron-coke in Laboratory Scale Tests

Enhancement of Low-temperature Gasification and Reduction by Using Iron-coke in Laboratory Scale Tests

Impact of Zinc on Gasification Reaction and Post-Reaction Strength of Ferro-coke

Effect of Mineral Matter on the Reactivity of Coke and its Replication in a Coke Analogue

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