The drying process requires energy but can be used to reduce volatile matter and sulfur as well. Ranking Lignite ranks fourth, or last, in heat and carbon content compared with other types of coal, according to ASTM D388 - 05 Standard Classification of Coals by Rank .
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Lignite: Lignite, generally yellow to dark brown or rarely black coal that formed from peat at shallow depths and temperatures lower than 100 °C (212 °F). It is the first product of coalification and is intermediate between peat and subbituminous coal according to the coal classification used in the United