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Culm (other)
Culm may refer to: * Culm (in British English), imperfect anthracite, a variety of coal **also some carboniferous rock strata known as the Culm Measures * Culm (in American English), coal refuse or coal waste * Culm (botany), the stem of a grass or sedge * River Culm, in Devon, England * Chełmno, Poland, formerly also known as Culm See also * Kulm (other) * Culm bank, a coalmine waste or spoil heap, a pitheap or as misnamed 'a slagheap' * Culm bomb * Purple moor grass and rush pastures, in Devon and Cornwall known as culm grassland {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthracite
Anthracite, also known as hard coal, and black coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 86% and 97%. The term is applied to those varieties of coal which do not give off tarry or other hydrocarbon vapours when heated below their point of ignition. Anthracite ignites with difficulty and burns with a short, blue, and smokeless flame. Anthracite is categorized into standard grade, which is used mainly in power generation, high grade (HG) and ultra high grade (UHG), the principal uses of which are in the metallurgy sector. Anthracite accounts for about 1% of global coal reserves, and is mined in only a few countries around the world. The Coal Region of northeastern Pen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
