The original concept of description of the coke optical texture

Piechaczek, M.; Mianowski, A.; Sobolewski, A.

doi:10.1016/j.coal.2014.07.002

Cited by 11 publications

(9 citation statements)

References 23 publications

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“…The semi-cokes display an isotropic nature, obtained during low-rank non-caking coal pyrolysis and poly-condensation, whereas coke is the carbon material derived from caking coal and it displays anisotropy (Figure ). The coke observed in this study has similar porosity to that observed by previous authors’ studies. , Meanwhile, Malumbazo reported that the reflectance increases with increasing pyrolysis temperature, and that the semi-coke from low-temperature pyrolysis had a lower reflectance than coke from high-temperature pyrolysis. Comparing Figures and, it is easy to distinguish semi-coke from coke by the optical structure.…”

Section: Resultssupporting

confidence: 87%

“…The coke observed in this study has similar porosity to that observed by previous authors’ studies. 13 , 36 Meanwhile, Malumbazo 37 reported that the reflectance increases with increasing pyrolysis temperature, and that the semi-coke from low-temperature pyrolysis had a lower reflectance than coke from high-temperature pyrolysis. Comparing Figures 3 and 4 , it is easy to distinguish semi-coke from coke by the optical structure.…”

Section: Resultsmentioning

confidence: 99%

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Change of the Petrographic Characteristics of Semi-Coke in the Iron Ore Sintering Process

Wang

Fang

et al. 2023

ACS Omega

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This study focuses on the petrographic analysis method to evaluate semi-coke and its combustion behavior in the sintering process, which has been seldom conducted before. Semicokes are different in morphological features, porosity, pore structure, and wall thickness, because of differences in the vitrinite and inertinite of the raw coal. Semi-coke displayed isotropy, and even after the drop tube furnace (DTF) and sintering process, it still retained its optical properties. Eight kinds of sintered ash were observed using reflected light microscopy. Petrographic analyzes for the combustion properties of semi-coke were based on its optical structure, morphological development, and unburned char. The results indicated that microscopic morphology was an important characteristic when trying to understand the behavior and burnout of semi-coke. These characteristics can be used to trace the origin of the unburned char in fly ash. The unburned semi-coke mostly existed in the form of inertoid, mixed dense and mixed porous. Meanwhile, it was found that most of the unburned chars were melted into sinter, resulting in inefficient fuel combustion.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Change of the Petrographic Characteristics of Semi-Coke in the Iron Ore Sintering Process

Wang

Fang

et al. 2023

ACS Omega

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“…A produção de coque com o uso de um único carvão é uma atividade de grande dificuldade, especialmente em função das atuais restrições de qualidade exigidas para a produção de gusa nos altos-fornos. Assim, o uso de diferentes carvões na elaboração de misturas é a alternativa empregada, pois cada um contribui com suas características químicas e físicas, possibilitando a obtenção de coque com a especificação desejada (13) .…”

Section: Elaboração De Misturas Para Coqueificaçãounclassified

Efeito da Adição de Coque Verde de Petróleo na Microestrutura e Características Metalúrgicas do Coque

MALAQUIAS¹

2022

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“…Textural coke analysis is an optical technique used internationally to determine coke quality from the rank, coal type, rheologic properties and blend composition of the parent coals as well as the temperature and time of coalification in the furnace (e.g. [1], [3], [8], [9], [10], [11], [12], [13], among others). The description of the optical textures, defined in the ASTM D5061-19 Standard for metallurgical coke, is based on the shape, ing.cienc., vol.…”

Section: Introductionmentioning

confidence: 99%

“…It's an accepted fact that resistance and reactivity of globally-recognized CRI and CSR quality indices which characterize coke behavior in a blast furnace [14], [16]. The description of morphological texture has also allowed the development of predictive models associated with the fibrous index (Wx), from the linear relation between the CSR and the Wx/Ro ratio [13]. Furthermore, previous studies have demonstrated that coke reactivity has an inverse relation with CAQ values, while their resistance has a directly proportional relation [14].…”

Section: Introductionmentioning

confidence: 99%

A Predictive Model for the Anisotropy Index of Semi-Coke Derived from the Properties of Colombia's Eastern Cordillera Coals

et al. 2020

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This study developed a theoretical model for the determination of the Coke Anisotropy Quotient (CAQ) of semi-coke from the properties of its precursor coal. This is an useful parameter to define the resistance and reactivity of semi-coke in the blast furnace. For 36 semi-coke samples, a textural analysis was performed alongside a fluidity test to determine the real CAQ. The main textures observed were: isotropic and circular for high volatile bituminous coals (HVB); lenticular and fine ribbons for the medium volatile bituminous coals (MVB); and medium and thick ribbons for the low volatile bituminous coals (LVB). The CAQ varied in a range from 1 to 11. A principal component analysis (PCA) and multiple regression allowed to discriminated the importance of certain coal properties, in determining the CAQ to be recognized and to estimate parameters of the mathematical model. The statistical analysis suggested that CAQ can be best predicted from the fluidity, volatile matter, and Ro of the parent coals. The veracity of this model result was then tested using a second dataset from Poland. This work optimizes the usefulness of standard datasets in the prediction of CAQ's offering a means of quality control that could be implemented in Colombian coke production.

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The original concept of description of the coke optical texture

Cited by 11 publications

References 23 publications

Change of the Petrographic Characteristics of Semi-Coke in the Iron Ore Sintering Process

Change of the Petrographic Characteristics of Semi-Coke in the Iron Ore Sintering Process

Efeito da Adição de Coque Verde de Petróleo na Microestrutura e Características Metalúrgicas do Coque

A Predictive Model for the Anisotropy Index of Semi-Coke Derived from the Properties of Colombia's Eastern Cordillera Coals

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