TYPES OF COAL
Anthracite Coal
Carbon Content: 86%-98%
Heat Value: 13,500 to 15,600 BTUs-per-pound
Hard and Shiny Black
Anthracite coal is the highest quality
metallurgical coal representing just 1% of
world coal reserves. It is the most versatile
coal, suitable for use in a broad range of steel
making and metallurgical processes. It is the
preferred coal for gasification and liquefaction
technologies, plastics and high quality synthetic
fuels.
Bituminous Coal
Carbon Content: 45%-86%
Heat Value: 11,000 to 15,000 BTUs-per-pound
Dark and Hard
Bituminous coal is considered a sedimentary
rock because is a product of the deep burial
and compaction of plant and mineral matter. It
is usually black, sometimes dark brown, often
with well-defined bands of bright and dull
material.
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Sub-bituminous Coal
Carbon Content: 35%-45%
Heat Value: 8,300 to 13,000 BTUs-per-pound
Dark and Soft
Sub-bituminous coal is lignite coal that has
been subjected to longer and deeper burial is
converted to a darker and harder coal ranks
below bituminous. Although its heat value is
lower, this coal generally has a lower sulfur
content than other types which makes it
cleaner burning.
Lignite Coal
Carbon Content 25%-35%
Heat Value: 5,000 to 8,300 BTUs-per-pound
Brown and Soft
Lignite, or brown coal, is a geologically young
coal and is mainly used for electric power
generation.
Because of its low energy density, lignite coal
is inefficient to transport and is not traded
extensively on the world market compared with
higher coal grades. It is often burned in power
stations constructed very close to mines, socalled mine mouth power plants.
Sources: www.theenergylibrary.com
and Fortune Minerals Ltd.
JUNE 2013
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