Role and composition of the mobile phase in coal

Grint, Alan; Mehani, Shahrokh; Trewhella, Martin J.; Crook, Malcolm

doi:10.1016/0016-2361(85)90334-5

Cited by 76 publications

(28 citation statements)

References 15 publications

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“…14) Simultaneously, heteroepoxide in the thermally decomposition product of HC had a negative influence on the thermoplastic properties of PC in the coking process. 15) From above, it suggested that the HC inhibited the adhesion between PC particles. The change in weight loss rate of BC was less than that of HC products derived from BC decomposition.…”

Section: Thermogravimetric Analysismentioning

confidence: 96%

Influence Mechanism of Lignite and Lignite Semi-coke Addition on Drum Strength of Coke

et al. 2018

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Section: Thermogravimetric Analysismentioning

confidence: 96%

Influence Mechanism of Lignite and Lignite Semi-coke Addition on Drum Strength of Coke

et al. 2018

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“…Several reasons justified the selection of the Gieseler semicokes: i) The coal composition is a key factor in the development of optical texture and porous structure of coal-based carbons and therefore the optical textures of semicoke and coke are closely related to the nature of the parent coal; ii) most of the characteristics of high-temperature coke are established in the temperature range 350-500°C, and after the resolidification process, the organization of carbon arrangements in the semicoke is preserved under the usual conditions of coke oven operation (Loison et al, 1989); iii) Gieseler plastometry is a useful technique and widely used in research and industry when deciding which coal or additive to use in a blend for coke production and to predict coke quality; iv) semicokes produced in dynamic and isothermal conditions in a Gieseler plastometer or in laboratory-scale ovens have provided valuable information on the development of optical texture as a function of coal properties (Hower and Lloyd, 1999) as well as on the mechanisms involved in the development of coal rheological properties with carbon-bearing additives (Grint et al, 1985;van Krevelen, 1993;Clemens and Matheson, 1995;Menendez et al, 1996Menendez et al, , 1997Sakurovs, 2000).…”

Section: Influence Of Charcoal On Semicoke Optical Texturementioning

confidence: 99%

Influence of charcoal fines on the thermoplastic properties of coking coals and the optical properties of the semicoke

Guerrero

Díez

Borrego

2015

International Journal of Coal Geology

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The aim of this work is to investigate the influence of the addition of organic inerts such as charcoal with a wellcontrolled particle size on the development of fluidity in three coking coals of different rank, maceral composition, and rheological properties. Three size fractions of charcoal, b20, 20-80, and 80-212 μm, that can be considered as artificially prepared inertinites were used. The different charcoal fractions were added in amounts of 2, 5, 10, and 15 wt.% to selected high-quality coking coals with a Gieseler maximum fluidity (Fmax) of 373 (LF), 541 (MF), and 1891 (HF) ddpm. Increasing the amount of charcoal in the blend led to a progressive inverse exponential reduction in fluidity. This reduction was accompanied by a shortening of the fluid interval due to an increase in the softening temperature. In the case of the finest charcoal fraction, the inhibition of fluidity was even more pronounced. The HF coal with a relatively high fluidity was very sensitive to minimum amounts of charcoal addition, losing nearly half of its fluidity when 5 wt.% charcoal was added. A similar reduction in Fmax was also observed for LF, while MF with only a slightly higher fluidity displayed a different trend. From the results it can be seen that the inherent characteristics of a coal are critical factors that affect the extent of the reduction in fluidity caused by the incorporation of charcoal. The differences can be partially attributed to the amount of inertinite present in the parent coal and to the macerals within the inertinite, especially fusinite, semifusinite, and inertodetrinite. In relation to petrographic changes in the matrix of the semicokes, there is a general trend for isotropic material to increase and the size of the anisotropic textures to decrease with the addition of charcoal. Inclusions within the semicoke matrix also change according to the amount and the size of the charcoal added to coal.

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“…5) In addition, heteroatoms like oxygen have a deleterious effect on the thermoplastic properties of coal. 18) From these, volatile matter released from woody biomass (including high amounts of oxygen) may inhibit the thermoplastic properties of coal. That is why the adhesion between coal particles, and between coal particle and woody biomass particle, is insufficient, as shown in Fig.…”

Section: Effect Of Woody Biomass Addition On Connectivity Between Coamentioning

confidence: 99%

Effect of Woody Biomass Addition on Coke Properties

et al. 2014

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The price of caking coal, which is used in the production of metallurgical coke, has risen in recent years. Also of concern is the amount of CO2 emitted from steel industries, comprising approximately 15% of total CO2 emissions in Japan. Therefore, CO2 emissions from the ironmaking process should be reduced to avoid global warming. In this work, fundamental research is conducted on the effect of adding woody biomass to the properties of coke, with the aim of possibly using woody biomass, which is carbon neutral, as a raw material in coke-making. Experimental results showed that the connectivity between coal particles in the coke sample during carbonization and coke strength drastically decrease by adding woody biomass to caking coal. However, the coke properties of the coke sample with added woody biomass could be improved by removing the partly volatile matter of woody biomass before mixing with caking coal, and as a result, the possibility of using woody biomass as a raw material for coke-making with prior carbonization at temperatures of more than 500°C was found.

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Role and composition of the mobile phase in coal

Cited by 76 publications

References 15 publications

Influence Mechanism of Lignite and Lignite Semi-coke Addition on Drum Strength of Coke

Influence Mechanism of Lignite and Lignite Semi-coke Addition on Drum Strength of Coke

Influence of charcoal fines on the thermoplastic properties of coking coals and the optical properties of the semicoke

Effect of Woody Biomass Addition on Coke Properties

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