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hard coal |
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anthraciteor hard coalCoal containing more fixed carbon than any other form of coal and the lowest amount of volatile (quickly evaporating) material, giving it the greatest heat value. The most valuable of the coals, it is also the least plentiful, making up less than 2% of all coal reserves in the U.S., with most of the known deposits occurring in the East. Anthracites are black and have a brilliant, almost metallic lustre. Hard and brittle, they can be polished and used for decorative purposes. They are difficult to ignite but burn with a pale-blue flame and require little attention to sustain combustion. In the past they were used for domestic heating, but today they have given way to other sources of energy (e.g., natural gas and electricity). hard coal [′härd ¦kōl] (mineralogy) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Molding sands with sea coal and sea coal substitute exhibited greater high temperature strength than the base sand or the sand with hard coal. Poland is among the world's leading producers and consumers of coal, with recoverable reserves of hard coal (bituminous and sub-bituminous) estimated at 41 billion tons. An auction for the delivery period 2007-2009 offered two products for sale: 100 MW referenced to the index for hard coal published by the German Federal Office of Economics and Export Control (BAFA), and 200 MW referenced to the API#2 coal index. |
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