Next page >> Showing page 1. Coal is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment. 3. Subbituminous coal contains 42 to 52 percent carbon (on a dry, ash-free basis) and has calorific values ranging from about 19 to 26 megajoules per kilogram (about 8,200 to 11,200 British thermal units per pound). Environmental Concerns Chapter 9. Professor Emeritus of Geological Sciences, University of Tennessee, Knoxville. Sub-bituminous coal typically is found near the surface, which results in lower mining costs, making it a relatively inexpensive coal. This form of coal is used almost exclusively for electric power generation. Vast deposits of coal originate in former wetlands —called coal forests —that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian) and Permian times. The next grade of coal is sub-bituminous coal. This is an updated version of an article first published by the Investing News Network in 2014. However, many significant coal deposits are younger than this and originate from the Mesozoic and Cenozoic eras. Sub-bituminous coal is a dull dark brown to black and not shiny type of coal. Bituminous has a higher heating value than either lignite or subbituminous, but less than that of anthracite. Please refer to the appropriate style manual or other sources if you have any questions. Maps, tools, and resources related to energy disruptions and infrastructure. It is used for the generation of steam–electrical power. sk Vzťahuje sa len na antracit , koksovateľné uhlie, ostatné bituminózne uhlie, subbituminózne uhlie a lignit/hnedé uhlie. However, coal chemistry at its various rank stages is also related to the biopolymers existed in its plants’ precursors that have been partially or totally altered via the coalification mechanism [40] . Please remember that by requesting an investor kit, you are giving permission for those companies to contact you using whatever contact information you provide. Most coal production is actually used in the country in which it … Bituminous coal usually has a high heating (Btu) value and is used in electricity generation and steel making in the United States. Sub-bituminous coal or black lignite is a category of coal which appears as grey-black or dark brown. Its Gross Calorific value is larger than 23,865 kJ/kg (5,700 kcal/kg). Wikipedia. 2. Noncoking coals are attractive for use in the coke-making coal blends, because they are cheaper and more available. 1 synonym for soft coal: bituminous coal. . Sub-bituminous coal is primarily used as a fuel for steam-electric power generation. Sub-Bituminous. Link to the new forms can be found in Part 4. Corrections? There are four varieties of coal, and all have their own specific uses. 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