Estimating the fusible content of individual coal grains and its application in coke making

Warren, K.; Krahenbuhl, Greg; Mahoney, Merrick R.; Hapugoda, Priyanthi

doi:10.1016/j.coal.2015.09.012

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…To standardize the moisture content, a moisture analysis was performed on a 20-25 g sample of the coal and the additional moisture required to achieve a moisture content of 5% was calculated and added. This resulted in a dry bulk density of approximately 830 kg m −3 , similar to that used by MacPhee et al for their sole-heated oven coke charges [1][2][3], as well as our previous studies [34]. A zirconia ceramic mould was placed inside the sole-heated oven and the base was lined with three Whatman filter sheets (grade 1 cellulose filter paper with a thickness of 180 µm).…”

Section: Metallurgical Coal Selectionmentioning

confidence: 52%

Comparison of a laboratory-scale coke and a pilot-scale coke from matched coal

Lomas

Roest

Wells

et al. 2020

Ironmaking & Steelmaking

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A coke produced using a custom-built sole-heated oven and a coke prepared in a pilot-scale oven from a matched coal, were compared using a range of analytical techniques. The aim of this comparison was to assess to what extent the small-scale sole-heated oven can successfully replicate the production of pilot-scale oven cokes, and thus be used to rapidly prepare and screen a wide range of cokes for particular characteristics, e.g. abrasion resistance. The techniques applied included conventional methods and novel methods developed by our research team. These included microstructural and microtextural analyses of samples of each coke, and tribological, scratch test and fractographic analyses, each of which elucidates different strength attributes. These include microstructural weaknesses, abrasion resistance, and the strength of microtextural interfaces. The level of replication achieved indicates that the sole-heated oven, used in combination with an annealing step in a muffle furnace, can be beneficially used to model the pilot-scale oven.

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Section: Metallurgical Coal Selectionmentioning

confidence: 52%

Comparison of a laboratory-scale coke and a pilot-scale coke from matched coal

Lomas

Roest

Wells

et al. 2020

Ironmaking & Steelmaking

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show abstract

“…In addition to the characterisation of the minerals, the carbon structures within the coke, and their changes, were characterised. This was carried out using high resolution light optical microscopy over the whole sample (using the CSIRO CGA technique 23,24) ) and by Raman spectroscopy of specific features within the samples. Raman spectroscopy is an established technique for examining carbon structure [6][7][8][9][10][11][12][13][14][15][16][17][18] .…”

Section: Mineral Reactions Under Blast Furnace Conditionsmentioning

confidence: 99%

Effects of Blast Furnace Representative Temperatures and Gas Compositions on Coke Reactivity

2023

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The effects of coke mineralogy on coke reactivity under conditions representative of the blast furnace were studied. Coke samples were reacted under coke reactivity index (CRI) like conditions (1100°C, 100% CO 2 ) and at higher temperatures and atmospheres designed to replicate conditions lower in the blast furnace.The effects of the minerals on reactivity changed as the temperature increased and the atmosphere was modified. At the lower temperatures investigated (1100-1350°C) with CO 2 present in the gas, gasification of the coke by CO 2 dominated. The effects of minerals in the coke on gasification by CO 2 under these conditions were similar to their reported effects on reactivity in the CRI test. At the highest temperature investigated, (1600°C), with no CO 2 , the mineral-carbon reactions dominated. The main reaction was the reduction of the silica in the coke. These results show that when coke-gasification is dominant, CRI data can be related to conditions beyond the temperature and gas environment the data were obtained, to the higher temperatures and less oxidising conditions of the blast furnace. At higher temperatures, mineral-carbon reactions are dominant, and more data in addition to that of the CRI, may be required to understand coke behaviour in the blast furnace.IMDC and RMDC within the coke were identified with the aid of the CGA technique, and the changes in the carbon structures within the coke studied using Raman spectroscopy. The carbon structures within the coke became more graphitic at 1600°C, with the change in RMDC greater than that in IMDC.

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“…Three main groups of macerals are classified into vitrinite, liptinite, and inertinite [21][22][23]. Moreover, they can be divided based on their different fusibility qualities into fusibles (some of the inertinite macerals as well as the vitrinite and liptinite macerals) and infusibles (the remaining inertinite macerals and minerals) [24][25][26][27][28].…”

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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Estimating the fusible content of individual coal grains and its application in coke making

Cited by 6 publications

References 2 publications

Comparison of a laboratory-scale coke and a pilot-scale coke from matched coal

Comparison of a laboratory-scale coke and a pilot-scale coke from matched coal

Effects of Blast Furnace Representative Temperatures and Gas Compositions on Coke Reactivity

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

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