Significance of coal quality on thermoplastic properties: a case study

Sahoo, Monica; Bhowmick, Trisrota; Mishra, Vivek; Pal, Sudip; Sharma, Mamta; Chakravarty, Sanchita

doi:10.1080/19392699.2019.1678470

Cited by 9 publications

(9 citation statements)

References 20 publications

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“…52 Vitrinite is one of the major maceral components. Considering each maceral has a unique and different molecular structure, 53,54 in this study, we isolated vitrain parts from bulky coal for structural characterization to avoid the effects by different types of macerals. were chosen as the studied samples.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Aromatic Clusters in Vitrinite-Rich Coal during Thermal Maturation by Using High-Resolution Transmission Electron Microscopy and Fourier Transform Infrared Measurements

et al. 2020

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In this study, we focus on a quantitative characterization of aromatic cluster evolution in vitrinite-rich coal during coalification processes. By employing high-resolution transmission electron microscopy (HRTEM) and Fourier transform infrared spectroscopy (FT-IR), a detailed structural evolution of the aromatic clusters has been characterized and analyzed. Based on the results, a stepwise aromatic structure evolution was observed and can be divided into four stages: 0.5 to ∼1.4%, ∼1.4 to ∼2.0%, ∼2.0 to 3.7%, and 3.7 to 4.2%. In the first stage (R o,ran =0.5% to ∼1.4%), naphthalene and 2 × 2 aromatic rings are tailored down from the main coal structure due to a cleavage of ether bonds and aliphatic bridge bonds. For R o,ran from ∼1.4% to ∼2.0%, new naphthalene and 2 × 2 aromatic rings are formed in the second stage through the aromatization of aliphatic structures. When R o,ran is from ∼2.0 to 3.7%, much more 3 × 3 and 4 × 4 aromatic rings are formed through the condensation of small aromatic rings. In the last stage for anthracite coals (R o,ran > 3.7%), larger-sized aromatic rings are formed mainly by the condensation of 3 × 3 aromatic rings. During the coalification process, 3 × 3 aromatic rings play important roles in the evolution of aromatic clusters. Small aromatic rings are first enlarged to 3 × 3 aromatic rings, and then these 3 × 3 aromatic rings would form large-scale aromatic clusters. HRTEM can also provide quantitative information of the spatial alignment of aromatic clusters in coal. In anthracite coals with R o,ran >3.7%, most of these fringes are highly aligned and share the same angle.

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Section: Introductionmentioning

confidence: 99%

Evolution of Aromatic Clusters in Vitrinite-Rich Coal during Thermal Maturation by Using High-Resolution Transmission Electron Microscopy and Fourier Transform Infrared Measurements

et al. 2020

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“…Thanks to complex and very variable chemical (molecular) and physical (conformational) properties of coal, conducting a detailed structural characterization of coal is extremely difficult, yet motivational still today (Hower et al, 2007). A petrographic analysis of coal can reveal its thermoplastic properties that are significantly important in the coal industry (Sahoo et al, 2019). Upon heating (carbonization) coal undergoes chemical and physical (softening, melting, fusing, and re-solidifying) changes.…”

Section: Beneficiation Of High-ash Coal and Its Combustion By-product...mentioning

confidence: 99%

Carbon-Based Raw Materials Play Key Roles in Technology of the 21st Century: Indian Case Studies

Fiket

Saikia²,

Chakravarty

et al. 2022

MGPB

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Coal is a vital carbon-based raw material which is used in the production of various advanced nanomaterials. This particularly holds true for the relevant research and development trends in India. New more environmentally friendly processes are under development with respect to metallurgical coke making and quality enhancement of high-ash Indian coal. Compared with chemical and physical methods, beneficiation of high-ash coal and its combustion by-products with organic liquids (various natural oils) are much more superior in terms of costs, efficiency, and environmental implications. Nanodiamonds have emerged as a key platform for nanoscience and nanotechnology developments. Indian scientists have applied eco-friendly and cost-effective ultrasonic assisted wet-chemical method to low-quality NE Indian coal and the resulting nanodiamond particles could have a wide range of applications in the field of microelectronics, optoelectronics, and biosensing. Also, Indian scientists have been working on ultrasonic-assisted chemical synthesis of activated carbon from low-quality subbituminous coal and its preliminary evaluation towards supercapacitor applications. This article shows that coal is a versatile and valuable raw material which should be saved for future generations at all costs.

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“…There are known papers devoted to establishing the relationship between the parameters of petrographic analysis and indicators of proximate and ultimate analyses and the relationship with the thermoplastic properties of coals. Thus, for example, the relationship between the content of volatile substances or carbon content and the reflectance of vitrinite for single coal has been studied in [29,30]. A strong negative correlation was observed between the volatile matter content and the reflectance of vitrinite.…”

Section: Introductionmentioning

confidence: 99%

“…[31] reported a positive dependence of the reflectance of vitrinite upon the carbon content. It has been observed [30] that the vitrinite maceral group and its sub-macerals have the strongest positive relationship with coal plasticity. Wang et al [31] studied coal samples with the reflectance of vitrinite within the range of 0.35 to 4.26%.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Effect of Multi-Component Coal Blends on Properties of Metallurgical Coke via Petrographic Analysis under Industrial Conditions

et al. 2022

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The coalification rank of the coal blend components and their caking properties initially impact the coke’s quality. In part, the quality of coke depends on the technological parameters of the coke production technology, such as the method of blend preparation, the coking condition, the design features of the coke ovens, and the technique used for post-oven treatment. Therefore, to improve the coke quality, the main attention is paid to the quality of the coal blend. The petrographic analysis is the simplest and most reliable way to control coal quality indicators under industrial conditions. In this paper, the effect of nine industrial blends on coke quality using petrographic analysis has been studied. Additionally, this paper addresses the efficient use of coals and the preparation of coal mixtures under industrial conditions, which contributes to the sustainability of cokemaking. For the preparation of blends, 17 coals were used, for which, in addition to petrographic and proximate analyzes, the maximum thickness of the plastic layer was determined. Industrially produced cokes were analyzed for coke reactivity index (CRI), coke strength after reaction with CO2 (CSR), and Micum indices (M25 and M10). It has been established that the petrographic properties of coal blends are reliable parameters for assessing the quality of coke under conditions of an unstable raw material base, multi-component blends, and changes in coking regimes. Moreover, the research results have shown that to ensure the rational use of coals in the preparation of coal blends to achieve the required coke quality and consequently the sustainability of cokemaking, it is necessary to consider not only the mean reflectance of vitrinite but the proximate and caking properties of coals.

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Significance of coal quality on thermoplastic properties: a case study

Cited by 9 publications

References 20 publications

Evolution of Aromatic Clusters in Vitrinite-Rich Coal during Thermal Maturation by Using High-Resolution Transmission Electron Microscopy and Fourier Transform Infrared Measurements

Evolution of Aromatic Clusters in Vitrinite-Rich Coal during Thermal Maturation by Using High-Resolution Transmission Electron Microscopy and Fourier Transform Infrared Measurements

Carbon-Based Raw Materials Play Key Roles in Technology of the 21st Century: Indian Case Studies

Investigation into the Effect of Multi-Component Coal Blends on Properties of Metallurgical Coke via Petrographic Analysis under Industrial Conditions

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