Ranks of coal – The classification of coal by diploma of hardness, moisture and heat content material materials. “Anthracite” is tough coal, almost pure carbon, used primarily for heating homes. “Bituminous” is tender coal. It is the most common coal found in the United States and is used to generate electrical vitality and to make coke for the steel industry. “Subbituminous” is a coal with a heating price between bituminous and lignite. It has low fastened carbon and excessive percentages of dangerous matter and moisture. “Lignite” is the softest coal and has one of the best moisture content material. It’s used for producing electrical power and for conversion into synthetic gasoline. By the use of Btu or “heating” content, anthracite has the perfect worth, adopted by bituminous, subbituminous and lignite.
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