• Czech: dřevěné uhlí
• Dutch: houtskool
• Esperanto: lignokarbo
• Finnish: hiili
• French: charbon
• German: Holzkohle
• Japanese: 炭 (すみ, sumi), 木炭 (もくたん, mokutan)
• Korean: 숯 (such, sut), 목탄 (木炭, moktan)
• Kurdish:

  Sorani: خه‌ڵوز

• Latin: carbo
• Navajo: t'eesh
• Polish: węgiel drzewny
• Portuguese: carvão
• Russian: уголь (usually used in its plural form угли)
• Spanish: carbón

• Czech: uhel
• Dutch: houtskool
• Finnish: hiili
• German: Kohle
• Japanese: 木炭 (もくたん, mokutan)
• Polish: węgiel
• Portuguese: carvão
• Russian: уголь
• Spanish: carboncillo

• ttbc Indonesian: arang (1)

Adjective

charcoal

1. of a dark gray colour.

Translations

Derived terms

• activated charcoal
• charcoal burner
• charcoal drawing
• charcoal grey

Related terms

• carbonara
• Carbonari
• charbroil
• vitrain

See also

• carbo vegetabilis
• briquette
• brown coal
• coal
• coal pot
• collier
• fusain
• kangri
• wood coal

Charcoal is the blackish residue consisting of impure carbon obtained by removing water and other volatile constituents from animal and vegetation substances. Charcoal is usually produced by heating wood, sugar, bone char, or others substances in the absence of oxygen (see char). The soft, brittle, lightweight, black, porous material resembles coal and is 85% to 98% carbon with the remainder consisting of volatile chemicals and ash.

The first part of the word is of obscure origin, but the first use of the term "coal" in English was as a reference to charcoal. In this compound term, the prefix "chare-" meant "turn", with the literal meaning being "to turn to coal". The independent use of "char", meaning to scorch, to reduce to carbon, is comparatively recent and is assumed to be a back-formation from the earlier charcoal. It may be a use of the word charren or churn, meaning to turn; i.e. wood changed or turned to coal, or it may be from the French charbon. A person who manufactured charcoal was formerly known as a collier (also as a wood collier). The word "collier" was also used for those who mined or dealt in coal, and for the ships that transported it.

History

Historically, production of wood charcoal in districts where there is an abundance of wood dates back to a very remote period, and generally consists of piling billets of wood on their ends so as to form a conical pile, openings being left at the bottom to admit air, with a central shaft to serve as a flue. The whole pile is covered with turf or moistened clay. The firing is begun at the bottom of the flue, and gradually spreads outwards and upwards. The success of the operation depends upon the rate of the combustion. Under average conditions, 100 parts of wood yield about 60 parts by volume, or 25 parts by weight, of charcoal; small scale production on the spot often yields only about 50%, large scale was efficient to about 90% even by the 17th century. The operation is so delicate that it was generally left to colliers (professional charcoal burners), who often worked in isolated groups in the woods and had a rather bad social reputation.

The massive production of charcoal (at its height employing hundreds of thousands, mainly in Alpine and neighbouring forests) was a major cause of deforestation, especially in Central Europe. In England, many woods were managed as coppices, which were cut and regrew cyclically, so that a steady supply of charcoal would be available (in principle) forever; complaints (as early as the Stuart period) about shortages may relate to the results of temporary over-exploitation or the impossibility of increasing production. The increasing scarcity of easily harvested wood was a major factor for the switch to the fossil fuel equivalents, mainly coal and brown coal for industrial use.

The modern process of carbonizing wood, either in small pieces or as sawdust in cast iron retorts, is extensively practiced where wood is scarce, and also for the recovery of valuable byproducts (wood spirit, pyroligneous acid, wood tar), which the process permits. The question of the temperature of the carbonization is important; according to J. Percy, wood becomes brown at 220 °C, a deep brown-black after some time at 280°, and an easily powdered mass at 310°. Charcoal made at 300° is brown, soft and friable, and readily inflames at 380°; made at higher temperatures it is hard and brittle, and does not fire until heated to about 700°.

In Finland and Scandinavia, the charcoal was considered the by-product of wood tar production. The best tar came from pine, thus pinewoods were cut down for tar pyrolysis. The residual charcoal was widely used as substitute for metallurgical coke in blast furnaces for smelting. Tar production led to rapid deforestation: it has been estimated all Finnish forests are younger than 300 years by their age. The end of tar production in the end of the 19th century meant also rapid re-forestation.

The charcoal briquette, first invented by Henry Ford, was first made using wood and sawdust scraps from his automotive assembly plant.

Types of charcoal

Commercial charcoal is found in either lump, briquette or extruded forms:

• Lump charcoal is made directly from hardwood material and usually produces far less ash than briquettes.

• Briquettes are made by compressing charcoal, typically made from sawdust and other wood by-products, with a binder and other additives. The binder is usually starch. Some briquettes may also include brown coal (heat source), mineral carbon (heat source), borax, sodium nitrate (ignition aid), limestone (ash-whitening agent), raw sawdust (ignition aid) and other additives like paraffin or petroleum solvents to aid in ignition.

• Extruded charcoal is made by extruding either raw ground wood or carbonized wood into logs without the use of a binder. The heat and pressure of the extruding process hold the charcoal together. If the extrusion is made from raw wood material, the extruded logs are then subsequently carbonized.

The characteristics of charcoal products (lump, briquette or extruded forms) vary widely from product to product. Thus it is a common misconception to stereotype any kind of charcoal, saying which burns hotter, etc.

Charcoal is sometimes used to power commercial road vehicles—usually buses—in countries where oil is scarce or completely unavailable. In the years immediately after the second world war, charcoal buses were in regular use in Japan and are still used today in North Korea.

Uses

One of the most important historical applications of wood charcoal was as a constituent of gunpowder. It was also used in metallurgical operations as a reducing agent, but its application has been diminished by the introduction of coke, anthracite smalls, etc. A limited quantity is made up into the form of drawing crayons; but the greatest amount is used as a fuel, which burns hotter and cleaner than wood. Charcoal is often used by blacksmiths, for cooking, and for other industrial applications.

Cooking fuel

Charcoal briquettes are widely used for outdoor grilling and barbecues in backyards and on camping trips.

In many non-industrialized countries, for instance in Africa, charcoal is used for everyday cooking by a large portion of the population. This is potentially a serious health problem when used indoors since carbon monoxide (CO) is a combustion product.

Industrial fuel

Charcoal is used in art for drawing, making rough sketches in painting, and is one of the possible media for making a parsemage. It must usually be preserved by the application of a fixative. Artists generally utilize charcoal in three forms:

• Vine charcoal is created by burning sticks of wood (usually willow or linden/Tilia) into soft, medium, and hard consistencies. Bamboo charcoal is the principal tool in Japanese Sumi-e (炭絵 lit: charcoal drawing) art.

• Compressed charcoal charcoal powder mixed with gum binder compressed into round or square sticks. The amount of binder determines the hardness of the stick. Compressed charcoal is used in charcoal pencils.

• Powdered charcoal is often used to "tone" or cover large sections of a drawing surface. Drawing over the toned areas will darken it further, but the artist can also lighten (or completely erase) within the toned area to create lighter tones.

Horticulture

One additional use of charcoal rediscovered recently is in horticulture. Although American gardeners have been using charcoal for a short while, research on Terra preta soils in the Amazon has found the widespread use of biochar by pre-Columbian natives to turn otherwise unproductive soil into very rich soil. The technique may find modern application, both to improve soils and as a means of carbon sequestration.

Sources, references and external links

• Barbecue Charcoal - The available choices for the backyard barbecue
• On Charcoal
• The Lump Charcoal Database - Information about lump charcoal.
• Photo of traditional charcoal production A forest kiln
• http://e-charcoalmaking.blogspot.com/ - Charcoal making community for livelihood
• http://e-charcoalmakingprocess.blogspot.com/ - Traditional charcoal production method, India
• The River Wey and Wey Navigations Community Site — a non-commercial site of over 200,000 words all about the Wey Valley and includes a photo file on charcoal production and information relating to gunpowder manufacture at Chilworth.
• http://www.nps.gov/cato/historyculture/charcoal.htm Catoctin Mountain Park, Maryland, USA, includes interpretive features ("Charcoal Trail", etc) on the history of charcoal making in the area.
• Bamboo Charcoal - Properties and Facts
• Coconut Charcoal - Facts
• Simple Home Charcoal Process
• Discovery of new charcoal production process and ARTI, Appropriate Rural Technologies Institute - Making powdered charcoal directly from sugar cane leaves and trash
• The "Adam-retort", or ICPS (Improved Charcoal Production System)
• Flash Carbonization is a pressurised highly efficient charcoal making process.

References

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