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Anthracite coal

black coal , hard coal , bituminous coal ,

Blind coal , black diamond, anthracite, metamorphic

black coal .

CompositionCarbon, 92–98%

Hard coal , or anthracite, is one of the types of coal that is characterized by its grayish-black color, and has a distinctive metallic luster. It is cohesive, compact, solid, homogeneous or applied coal , with a percentage of carbon in its organic mass 91-97%. It is one of the finest natural coal as a source of thermal energy.

Hard coal is one of the most highly metamorphic (but still first-order metamorphic) coals , with a carbon content of between 92% and 98%. ^[ The term applies to coals that do not produce tar or other hydrocarbon vapors when exposed to temperatures below their flash point. Hard coal burns hardly with a short, blue, smokeless flame.

Names

launch. Black coal has several names, including: black coal , hard coal , bituminous coal , blind coal , black diamond, and anthracite.

Properties

Hard coal (Ippenborn, Germany).

Hard coal (in Minneapolis, Bay City, Michigan).

Mining history and use

Hard coal crusher and power house buildings, new mexico, c. 1935.

Hard coal is "fighting fuel," a poster from World War II.

Hard coal today

Mining

Estimation of size and degree

Standard Grade High Grade Ultra High Grade Coke Moisture (Maximum) 15% 15% 13% 5% Ash (Maximum) 20% 15% 12% 14% Volatilization (Maximum) 10% 10% 5% 2% Carbon (Minimum) 73% 80% 85%84%Sulfur (maximum)1%1%0.6%0.8%

A group of Ripper boys, in a 1910 photograph, by Louis Henn.

high class

ClassificationMinimum size (in)Maximum size (in)Chestnut 7/81 ⁄ ² _Peas9 /167/8Buckwheat3/89/16Rice3/163/8Barley3/323/16

Underground fires