Cellular coal products and processes
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United States of America Patent
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Sep 15, 2009
Grant Date -
Sep 16, 2004
app pub date -
Mar 29, 2004
filing date -
Dec 2, 1999
priority date (Note) -
Expired
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Abstract
that is produced by the controlled heating of small coal particulate in a “mold” and under a non-oxidizing atmosphere. The coal starting material preferably exhibits a free swell index of between about 3.5 and about 5.0 and most preferably between about 4.0 and about 4.5. The porous product thereby produced can be machined, adhered and otherwise fabricated to produce a wide variety of low cost, low density products, or used in its preformed shape as a filter, heat or electrical insulator etc. Such porous products, without further treatment exhibit compressive strengths of up to about 6000 psi. Further treatment by carbonization or graphitization yields products that can be used as electrical or heat conductors. Methods for the production of these coal-based cellular products are also described.
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