Non-coking coal to coke: use of biomass based blending material

Das, Shekher; Sharma, Sapna; Choudhury, Ratna

doi:10.1016/s0360-5442(01)00091-3

Cited by 23 publications

(10 citation statements)

References 4 publications

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“…Bulk density of products -four tar contents were used, samples 1-4, 0 wt%; 5-8, 5 wt%; 9-12, 10 wt%; 13-16, 15 wt%. In each set the first sample (1,5,9,13) was carbonized at 900°C for 2 h, the second (2,6,10,14) at 950°C for 2 h, the third (3,7,11,15) at 900°C for 5 h and the fourth (4,8,12,16) at 950°C for 5 h. was considerably higher, the pore volume of a BF coke per unit mass was higher than that of the VBC products. The helium density of products from coal and briquettes was similar when no tar was added, but that of the coal derived products tended to be higher when tar was added.…”

Section: Carbonisation Conditionsmentioning

confidence: 99%

“…Coking coals are defined as those coals that possess a plastic stage in carbonization, first soften then swell and resolidify at higher temperature to form coke [5,[9][10][11][12][13]. This plastic phase carbonization process produces partially ordered graphite structure which leads to an inherently strong and relatively unreactive coke [5,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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An attempt to produce blast furnace coke from Victorian brown coal

Mollah

Jackson

Marshall

et al. 2015

Fuel

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Section: Carbonisation Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An attempt to produce blast furnace coke from Victorian brown coal

Mollah

Jackson

Marshall

et al. 2015

Fuel

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“…The treatment can greatly increase the strength and reactivity of sub-bituminous coal. Non-coking coal is upgraded to metallurgical coke by blending with biomass materials such as bagasse pitch, coconut shell, coconut waste, molasses, and sawdust [8]. In addition, carbon deposition within porous low-grade iron which is produced through integrated coal pyrolysis-tar decomposition shows excellent activity in reduction reactions.…”

Section: Introductionmentioning

confidence: 99%

Optimum temperatures for carbon deposition during integrated coal pyrolysis–tar decomposition over low-grade iron ore for ironmaking applications

Cahyono

Yasuda

Nomura

et al. 2014

Fuel Processing Technology

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Carbon deposited within low-grade iron ore, which was produced using an integrated process of coal pyrolysis and tar decomposition, showed high reactivity as a reducing agent. Coal pyrolysis and tar decomposition were both highly sensitive to temperature and exhibited contrasting behaviours during carbon deposition. In these experiments, the optimum temperatures for pyrolysis and tar decomposition were determined to obtain maximum carbon deposition within porous iron ore. High-temperature pyrolysis generated large amounts of volatile matter (tar and gases), which caused high tar decomposition and produced large amounts of deposited carbon and gases. The deposited carbon was the major product of tar decomposition at lower temperatures (400-600 °C), whereas mainly gases were produced at higher temperatures (700-800 °C), because of gasification of carbon. However, sintering started at 800 °C, and it significantly diminished the BET surface area and pore size distribution. The highest amount of deposited carbon was obtained at a pyrolysis temperature of 800 °C and a tar decomposition temperature of 600 °C. Hamersley ore gave higher amounts of deposited carbon than Robe-river ore because of its large pore size less than 4 nm, which was suitable for carbon deposition. The pore size distribution was a more important factor than the surface area in the carbon deposition process. Based on these results, the proposed system could achieve maximum carbon deposition in porous iron ore and solve problems related to reducing agents, tar materials, and the use of expensive raw materials in the ironmaking industry.

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“…Following its use in the isobutane reaction, the adsorption capacity of the material decreased significantly after running for 3 d. The BET-specific surface area, average pore volume, and pore radius of the sample all decreased following its application to the reaction. This was attributed to the hard, dense coke covering the surfaces of the CSAC, and blocking its micropores [39,40]. Based on the N2 adsorption-desorption results, the SBET and VP decreased to 343.3 m 2 /g and 0.20 cm 3 /g, respectively.…”

Section: Surface Properties and Porosities Of Carbon Catalystsmentioning

confidence: 98%

Direct dehydrogenation of isobutane to isobutene over carbon catalysts

Zhang

Wang

et al. 2015

Chinese Journal of Catalysis

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Various carbon materials were found to function as highly active catalysts for the direct dehydrogenation of isobutane without the addition of oxidizing gases (such as oxygen, carbon dioxide or nitrous oxide) or the deposition of metal particles. Among these materials, coconut shell activated carbon (CSAC) generated the highest isobutane conversion of 70%. It is notable that the CSAC catalyst exhibited a high degree of catalytic stability that was comparable to that of conventional catalysts and was able to maintain a selectivity for isobutene of approximately 76%. The most important factor with regard to the catalytic activity of both fresh and used carbon catalysts was determined to be the specific surface area of the material. These results are unique since they indicate that various carbon materials, including deposited coke, can behave as effective catalysts for the isobutane conversion reaction even without the presence of functional groups.

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Non-coking coal to coke: use of biomass based blending material

Cited by 23 publications

References 4 publications

An attempt to produce blast furnace coke from Victorian brown coal

An attempt to produce blast furnace coke from Victorian brown coal

Optimum temperatures for carbon deposition during integrated coal pyrolysis–tar decomposition over low-grade iron ore for ironmaking applications

Direct dehydrogenation of isobutane to isobutene over carbon catalysts

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