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How is coal ranked

Coal comes in four main types or ranks lignite or brown coal bituminous coal or black coal anthracite and graphite Each type of coal has a certain set of physical parameters which are mostly controlled by moisture volatile content in terms of aliphatic or aromatic hydrocarbons and carbon content

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    Vitrinite Reflectance Coal Analysis Kentucky Geolo

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    Division Of Geology And Mineral Resources Coal

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    What Is Coal World Coal Association

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    Circular 891 Glossary Of Coal Classification Syste

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    ASTM D388 19 Standard Classification Of Coals By R

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    Classification Of Coal By Rank ASTM D38812

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