Anthracite (Greek Ανθρακίτης, literally "a type of coal", from Anthrax [Άνθραξ] , coal) is a hard, compact variety of mineral
coalthat has a high lustre. It has the highest carboncount and contains the fewest impurities of all coals, despite its lower calorific content.
Anthracite coal is the highest of the metamorphic rank, in which the carbon content is between 92% and 98%. [ [http://www.faculty.uaf.edu/ffrg/min454/Handout2_UMM.doc MIN 454: Underground Mining Methods handout] from course at the University of Alaska Fairbanks, itself citing "Coal Mining Technology Theory and Practice", by Stefanko; undated, accessed on 10 February 2008] The term is applied to those varieties of coal which do not give off
tarry or other hydrocarbonvapours when heated below their point of ignition. Anthracite ignites with difficulty and burns with a short, blue, and smokeless flame.
Other terms which refer to anthracite are blue coal, hard coal, stone coal (not to be confused with the German "Steinkohle" or Dutch "steenkool" which are broader terms meaning all varieties of coal of a stonelike
hardnessand appearance, like bituminous coaland often anthracite as well, as opposed to Lignite, which is softer), blind coal (in Scotland), Kilkenny coal (in Ireland), crow coal (or craw coal from its shiny black appearance), and black diamond ("Blue Coal" is the term for a once-popular, specific, trademarked brand of anthracite coal, mined by the Glen Alden Coal Company in Pennsylvania, and sprayed with a blue dye at the mine before shipping to its Northeastern U.S.A. markets to distinguish it from its competitors). The imperfect anthracite of north Devonand north Cornwall(around Bude) in England, which is used as a pigment, is known as culm. Culm is also the term used in geological classification to distinguish the strata in which it is found and similar strata in the Rhenish hill countries are known as the Culm Measures. In America, culm is used as an equivalent for waste or slack in anthracite mining.
Anthracite is similar in appearance to the
mineraloidjet and is sometimes used as a jet imitation.
Anthracite differs from ordinary
bituminous coalby its greater hardness, its higher relative densityof 1.3-1.4, and luster, which is often semi-metallic with a mildly brown reflection. It contains a high percentage of fixed carbon and a low percentage of volatile matter. It is also free from included soft or fibrous notches and does not soil the fingers when rubbed. Anthracitization is the transformation of bituminous coal into anthracite coal.
The moisture content of fresh-mined anthracite generally is less than 15 percent. The heat content of anthracite ranges from 22 to 28 million Btu per
short ton(26 to 33 MJ/kg) on a moist, mineral-matter-free basis. The heat content of anthracite coal consumed in the United States averages 25 million Btu/ton (29 MJ/kg), on the as-received basis (i.e., containing both inherent moisture and mineral matter). Note: Since the 1980s, anthracite refuse or mine waste has been used for steam electric power generation.
Anthracite coal may be considered to be a transition stage between ordinary bituminous coal and
graphite, produced by the more or less complete elimination of the volatile constituents of the former; and it is found most abundantly in areas that have been subjected to considerable earth-movements, such as the flanks of great mountain ranges. Anthracite coal is a product of metamorphismand is associated with metamorphic rocks, just as bituminous coal is associated with sedimentary rocks. For example, the compressed layers of anthracite that are deep mined in the folded (metamorphic) Appalachian Mountainsof the Coal Regionof northeastern Pennsylvaniaare extensions of the layers of bituminous coal that are strip mined on the (sedimentary) Allegheny Plateauof Kentuckyand West Virginia, and Western Pennsylvania. In the same way the anthracite region of South Walesis confined to the contorted portion west of Swanseaand Llanelli, the central and eastern portions producing steam coal, coking coaland domestic house coals.
Structurally it shows some alteration by the development of secondary divisional planes and fissures so that the original stratification lines are not always easily seen. The thermal conductivity is also higher, a lump of anthracite feeling perceptibly colder when held in the warm hand than a similar lump of bituminous coal at the same temperature. The chemical composition of some typical anthracites is given in the article
Wales, anthracite was burned as a domestic fuel from the medieval period or earlier. [Owen, George, "The Description of Pembrokeshire", Dillwyn Miles (Ed), Gomer Press, Llandysul, 1994, ISBN 185902-120-4, pp 60, 69-70, 90-95, 139, 255]
In the United States, anthracite coal history began in 1790 in
Pottsville, Pennsylvania, with the discovery of coal made by the hunter Necho Allenin what is now known as the Coal Region. Legend has it that Allen fell asleep at the base of Broad Mountainand woke to the sight of a large fire because his campfire had ignited an outcropping of anthracite coal. By 1795, an anthracite-fired iron furnace had been built on the Schuylkill River.
Anthracite was first experimentally burned as a residential heating fuel in the USA on 11 February 1808, by Judge
Jesse Fellin Wilkes-Barre, Pennsylvania, on an open grate in a fireplace. Anthracite differs from wood in that it needs a draft from the bottom, and Judge Fell proved with his grate design that it was a viable heating fuel.
In the spring of 1808, John and Abijah Smith shipped the first commercially-mined load of anthracite down the
Susquehanna Riverfrom Plymouth, Pennsylvania, marking the birth of commercial anthracite mining in the United States. From that first mine, production rose to an all-time high of over 100 million tons in 1917.
From the late 1800s until the 1950s, anthracite was the most popular fuel for heating homes and other buildings in the northern United States, until it was supplanted first by oil burning systems and more recently by natural gas systems as well. Many large public buildings, like schools, were heated with anthracite-burning furnaces through the 1980s.
Current anthracite production averages around 5 million tons per year.
The principal use of anthracite today is for a domestic fuel in either hand-fired stoves or automatic stoker furnaces. It delivers high energy per its weight and burns cleanly with little soot, making it ideal for this purpose. Its high value makes it prohibitively expensive for power plant use. Other uses include the fine particles used as filter media, and as an ingredient in
Anthracite is processed into different sizes by what is commonly referred to as a breaker (see
coal). The large coal is raised from the mine and passed through breakers with toothed rolls to reduce the lumps to smaller pieces. The smaller pieces are separated into different sizes by a system of graduated sieves, placed in descending order. Sizing is necessary for different types of stoves and furnaces.
American Civil War, Confederate blockade runners used anthracite to avoid giving away their position to the blockaders.Fact|date=February 2008
In the early 20th century United States, the Lackawanna Railroad started using only the more expensive anthracite coal in their passenger locomotives, dubbed themselves "The Road of Anthracite," and advertised widely that travelers on their line could make railway journeys without getting their clothing stained with soot. The advertisements featured a white-clad woman named Phoebe Snow and poems containing lines like "My gown stays white / From morn till night / Upon the road of Anthracite". Similarly, the Great Western Railway in the UK was able to use its access to anthracite (it dominated the anthracite region) to earn a reputation for efficiency and cleanliness unmatched by other UK companies.
Formerly, anthracite was largely used, both in America and South Wales, as blast-furnace fuel for iron smelting, but for this purpose it has been largely superseded by coke in the former country and entirely in the latter. An important application has, however, been developed in the extended use of internal combustion motors driven by the so-called "mixed", "poor", "semi-water" or "Dowson gas" produced by the
gasificationof anthracite with air and a small proportion of steam. This is probably the most economical method of obtaining power known; with an engine as small as 15 horse-power the expenditure of fuel is at the rate of only 1 lb. per horse-power hour, and with larger engines it is proportionately less. Large quantities of anthracite for power purposes were formerly exported from South Wales to France, Switzerland and parts of Germany. Commercial mining has now ceased.
In June 2008, anthracite was US$150/
short tonwholesale. [ [http://www.nytimes.com/2008/06/10/us/10coal.html?pagewanted=print New York Times] retrieved June 21, 2008]
Anthracite coal mining today
Anthracite coal mining in Eastern Pennsylvania continues in the early 21st Century and contributes up to 1% of the Pennsylvania Gross State Product. Over 2,000 people were making their living mining anthracite coal as of 1995. Most of the mining currently involves reclaiming coal from slag heaps (waste piles from past coal mining) next to closed mines. Some underground anthracite coal mining is also taking place up to this day. As petroleum and natural gas grow more expensive, anthracite coal is growing more important as an energy source for an energy-hungry country. [http://www.dep.state.pa.us/dep/deputate/enved/go_with_inspector/coalmine/Anthracite_Coal_Mining.htm Source]
Historically from time to time, underground veins of coal have caught fire, probably from careless or unfortunate mining activities. The pocket of ignited coal is fed oxygen by vent paths that have not yet been discovered. These smolder year in, year out. Exhaust vents in populated areas are soon sensed and are sealed. Vents in uninhabited areas remain undiscovered. Occasionally, vents are discovered via fumes sensed by passers-by, often in forested areas. Attempts to extinguish those remaining have been futile. The existence of the site of the underground combustion is usually identified in the winter where fallen snow is seen to be melted by the warmth conducted from below. Proposals for harnessing this heat as geothermal energy have not been successful. Several such combustion areas exist today, known mainly to the local Wyoming Valley residents.
A vein of anthracite that caught fire in
Centralia, Pennsylvaniain 1962 has been burning ever since, turning the once thriving mining hamlet into a ghost town. [Bellows, Alan (2006) [http://www.damninteresting.com/?p=479 "The Smoldering Ruins of Centralia"] DamnInteresting.com (accessed August 29, 2006)]
The largest fields of anthracite coal in the
United Statesare found in Northeastern Pennsylvaniacalled "the Coal Region", where there are 7 billion short tons (6.3 billion tonnes) of minable reserves. Deposits at Crested Butte, Coloradowere mined historically.
Anthracites of newer, tertiary or cretaceous age, are found in the Crow's Nest part of the
Rocky Mountainsin Canada, and at various points in the Andesin Peru.
The common American classification is as follows:Fact|date=December 2007
Lump, steamboat, egg and stove coals, the latter in two or threesizes, all three being above 1-1/2 in. size on round-hole screens.
The primary sizes used in the United States for domestic heating are Chestnut, Pea, Buckwheat and Rice, with Chestnut and Rice being the most popular. Chestnut and Pea are used in hand fired furnaces while the smaller Rice and Buckwheat are used in automatic stoker furnaces. Rice is currently the most sought after size due to the ease of use and popularity of that type of furnace.
In South Wales a less elaborate classification is adopted, but great care is exercised in hand-picking and cleaning the coal from included particles of pyrites in the higher qualities known as best malting coals, which are used for kiln-drying malt and hops.
Anthracite dust can be made into
briquettes and is sold in the United Kingdomunder trade names such as Phurnacite, Ancit and Taybrite.
Bituminous coal, another kind of coal
Coal Region, Anthracite coal region in Pennsylvania, USA
* [http://www.dep.state.pa.us/dep/deputate/minres/bmr/annualreport/2000/map_coal.pdf Distribution of Pennsylvania Coals ]
* [http://www.msha.gov/District/Dist_01/History/history.htm History of anthracite coal mining]
* [http://www.phmc.state.pa.us/ppet/eckley/page1.asp?secid=31 "A Jewel In the Crown of Old King Coal Eckley Miners' Village" by Tony Wesolowsky, "Pennsylvania Heritage Magazine", Volume XXII, Number 1 - Winter 1996]
* [http://www.orangewaternetwork.org The Eastern Pennsylvania Coalition for Abandoned Mine Reclamation]
* [http://www.anthracitemuseum.org/ The Anthracite Heritage Museum. ]
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