Results 251 to 260 of about 9,406,850 (295)
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Coal ash composition of Australian low rank coals
Hyperfine Interactions, 1992The iron-containing phases in nine precipitator ashes of widely differing composition have been analyzed by57Fe Mossbauer spectroscopy. The importance of the relative proportion of calcium ferrite to magnesioferrite in determining the ash fusion characteristics was established and a procedure developed which reproduced the observed proportion, starting
L. J. Brown, J. D. Cashion, R. C. Ledger
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Catalytic Hydroliquefaction of Low-Rank Coals
Energy Sources, 1983Abstract Hydroliquefaction behavior of α-cellulose, leonardite, four lignites, and two subbituminous coals suspended in an anthracene oil carrier has been investigated in the presence of Co-Mo/Al2O3 catalyst at 425°C and at an average pressure of 1,300 psig in a batch reactor for 30-min reaction time.
K. Gürüz +3 more
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Laser ignition of low-rank coal
Russian Journal of Physical Chemistry B, 2016The measured thresholds (Hcr) and kinetic characteristics of the ignition of the volatile substances and the coke residue of low-rank coal under the action of the pulses of a neodymium laser (1064 nm, 120 μs) are reported here. The ignition of volatile substances was observed in microsecond (Hcr = 0.3 J/cm2) and millisecond time intervals (Hcr = 1.2 J ...
B. P. Aduev +5 more
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Flotation frothers for low‐rank coals
Journal of Applied Chemistry, 1955AbstractA number of aliphatic alcohols and acids, phenols and other heteropolar compounds were studied as flotation frothers for a tetralin‐conditioned low‐rank coal.The effects of these reagents, in the absence of coal, on the static surface tension of water and on froth formation and the character of bubble streams in aqueous solutions were ...
J. Mainhood, P. F. Whelan
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Preconversion treatments of low-rank coal
Fuel, 1992Tests were performed to study the effects of various preconversion treatments on the first-stage conversion of Indian Head lignite to THF-soluble products. Solvents investigated included coal-derived anthracene oil, a cresylic acid solvent, and tetralin; gases tested included hydrogen, carbon monoxide, and argon.
John R. Rindt +4 more
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The surface chemistry of low-rank coals
Advances in Colloid and Interface Science, 1987Abstract The characterization of the surface properties of coals is becoming increasingly important in the understanding of many utilization processes. While there are numerous publications on the surface characteristics of high rank coals, the lignites have received scant attention.
Keith B. Quast, David J. Readett
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Microbial Conversions of Low Rank Coals
Bio/Technology, 1991Coal is the United States' most abundant nonrenewable energy resource. However, the quality of many coals is too low to offset the practical, economic, and regulatory barriers to their utilization. A variety of bacterial and fungal species have been shown to attack low rank (i.e., low–quality) coals. Technologies based on these microbial activities may
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Structural features of low-rank coals
Resources, Conservation and Recycling, 1990Abstract Low-rank coals are characterized by low aromaticities, small aromatic ring clusters, abundant aliphatic and hydroaromatic carbon and hydrogen, and high oxygen contents. Typically, f a values (the fraction of aromatic carbon) range between 0.5 and 0.75. The aromatic clusters contain one to three fused rings. Polymethylene bridges between
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