Oxidation Rates of Industrial Cokes with CO2 and Air.

Zamalloa, M.; Ma, Dengbo; Utigard, T. A.

doi:10.2355/isijinternational.35.458

Cited by 25 publications

(15 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Zamalloa et al [11] compared petroleum coke, breeze coke and graphite powders in oxidation experiments under air and CO 2 . They showed that coke particles display highest oxidation rates and the rates increased with decreased particle size.…”

Section: Melting Behavior Of Mold Fluxesmentioning

confidence: 99%

Untitled

2013

JMSE-B

View full text Add to dashboard Cite

The melting kinetics of mold fluxes used in steel continuous casting represents a fundamental factor to be considered in order to obtain a quality product without superficial defects and also to avoid production problems. This melting stage is controlled mainly by the type and amount of carbonaceous material added to the powder. In this work, structure, particle size and morphology of two carbonaceous materials: petroleum coke and synthetic graphite were analyzed. Both carbonaceous materials were separately added to a decarburized commercial mold flux. The melting behavior was monitored by HSM (hot stage microscopy) and a melting interval was identified using critical temperatures. A higher fusion rate, as inverse of melting interval, was observed in powder with coke addition. This fact was associated to a lower crystalline degree and a finer PSD (particle size distribution) presented by petroleum coke. Different values of the activation energy of decomposition were related to fusion rate of both mold fluxes. Higher rate of changes in activation energy during the progress of the reaction was observed in the sample with coke. This fact is associated to a faster change in the surface area of coke particles.

show abstract

Section: Melting Behavior Of Mold Fluxesmentioning

confidence: 99%

Untitled

2013

JMSE-B

View full text Add to dashboard Cite

show abstract

“…Plusieurs auteurs ont étudié la réactivité du coke au CO2 [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Malgré le nombre important d'études consacrées à ce sujet, il existe encore des divergences d'opinions en ce qui a trait à la réactivité.…”

Section: Effet Du Niveau De Calcination Du Coke Et De La Cuisson Des unclassified

“…Malgré le nombre important d'études consacrées à ce sujet, il existe encore des divergences d'opinions en ce qui a trait à la réactivité. En effet, pour certains auteurs [25], la réactivité est fortement reliée à la longueur cristalline (Le) tandis que pour d'autres la réactivité est plutôt reliée à la surface accessible [13,[15][16][17][18][19].…”

Section: Effet Du Niveau De Calcination Du Coke Et De La Cuisson Des unclassified

Réactivité de l'anode et désulfuration :

Bergeron-Lagacé¹

2012

View full text Add to dashboard Cite

V Dans le but de comprendre la façon dont le soufre est émis lors de la désulfuration, une seconde étude a été effectuée sur du coke de pétrole calciné en laboratoire ainsi que sur des cokes verts (coke de pétrole non-calciné). Les analyses de type XPS montrent que certains liens chimiques semblent majoritairement présents lors de la calcination à de hautes températures. De plus, la désulfuration se produit lentement jusqu'à une température supérieure à 1400°C puis la réaction s'accélère. Finalement, le soufre n'est pas réparti de façon similaire entre les différents cokes verts lorsque différentes espèces chimiques du souffre sont considérées.

show abstract

“…The predecessors have done a lot of work about the change of physical and chemical properties of coke in BF, focusing on the following three aspects: (1) The evolution law of coke properties in practical BF is studied through three ways: BF dissection, coke sampling in experimental BF and BF tuyere sampling [9][10][11][12]. (2) In the laboratory, the multiphase reaction behavior of coke was studied by simulating the atmosphere, primary slag composition, and alkali metal conditions in the BF [13,14]. (3) The effect of coke on the flow law of slag iron in dead stock [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Protective mechanism of unburned pulverized coal to coke in blast furnace

Xiang

Shen

Jiang

et al. 2019

J min metall B Metall

View full text Add to dashboard Cite

The edge and internal morphology of coke with different contents of UPC (unburned pulverized coal) after reaction with CO 2 were analyzed by SEM. The influence of UPC on CRI (coke reactivity)，CSR (coke strength after reaction) and apparent porosity was also studied. The synthetic weighted mark method was used to analyze the comprehensive effect of UPC content on coke quality. The results show that because of the decrease of the content of intermediates C f (O) and C(O)C f (O) the restrictive step between the coke and CO 2 is an interfacial chemical reaction, and it accords with the Mckewan equation 1-(1-α) 1/3 =kt. The UPC has a strong effect on coke when the content of UPC is 10~20%; meanwhile , the CRI and the apparent porosity are significantly decreased by 6.8% and 9.5%, respectively, and the CSR is significantly increased by 3.8%. The UPC can effectively reduce the effect of CO 2 on the edge and the internal erosion of coke; the large pores and the pulverization of coke were avoided. The results of the synthetic weighted mark method showed that the comprehensive quality of coke changed greatly when the content of unburned pulverized coal was 11.24~20.87%, which is in agreement with the experimental results.

show abstract

Oxidation Rates of Industrial Cokes with CO2 and Air.

Cited by 25 publications

References 1 publication

Untitled

Untitled

Réactivité de l'anode et désulfuration :

Protective mechanism of unburned pulverized coal to coke in blast furnace

Contact Info

Product

Resources

About