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Main characteristics and uses of various types of coal: 1. Lignite is the coal with the lowest degree of coalification. It is characterized by high moisture content, low specific gravity, high volatile matter, non-adhesiveness, strong chemical reactivity, poor thermal stability, low calorific value, and contains varying amounts of humic acid. It is often used as fuel, as a raw material for gasification or low-temperature carbonization, and can also be used to extract lignite wax and humic acid, as well as to produce sulfonated coal or activated carbon. Lignite No. 1 can also be used as an organic fertilizer for farmland and orchards. 2. Long-flame coal has a very high volatile matter content; it has no bonding property or only a very slight one. The thickness of its gum layer is no more than 5 mm. It burns easily and produces long flames, which is why it is called long-flame coal. It can be used as a raw material for gasification and low-temperature carbonization, as well as as a fuel for domestic use and power generation. 3. Non-stick coal has a high moisture content and lacks cohesion; it basically does not produce colloids when heated, has a low calorific value during combustion, and contains certain amounts of secondary humic acid. It is mainly used in the production of gas and as a fuel for domestic use or power generation. 4. Weakly caking coal has a high moisture content, weak cohesion, and a high volatile matter content; it produces less gum when heated, and can coking on its own. However, the resulting coke pieces are small and fragile, resulting in a high rate of powdered coke. This type of coal is mainly used as a feedstock for gasification and as a fuel source. 5. The 1/2 medium-cohesion coal has moderate cohesion and medium to high volatile matter content. It can be used as raw material for coal blending in coking, as well as as coal for gasification and as a fuel for power generation. 6. Bituminous coal has a high volatility content, a thick vitrinite layer, and poor thermal stability. It can coking on its own, but the resulting coke is long and fragile, has a high shrinkage rate, numerous longitudinal cracks, and poor resistance to crushing and wear. Therefore, it can only be used in coal blending for coking; it can also be used for oil refining, gas production, nitrogen fertilizer manufacture, or as a fuel source. 7. Gas-rich coal has very high volatile matter and caking properties; its coking ability lies between that of gas coal and rich coal. When used for coking alone, it produces large amounts of gaseous and liquid chemical substances. It is most suitable for producing gas through high-temperature carbonization, and is also an excellent raw material for coal blending in coke production. 8. Fat coal possesses excellent cohesion and moderate to high volatiles; when heated, it produces a large amount of gum, forming a gum layer larger than 25 mm, giving it the strongest coking property. When this coal is used for coking, coke with excellent fluidity and wear resistance can be produced; however, this coke has many transverse cracks, and the root portion often features honeycomb structures, making it prone to breaking into small pieces. Due to its strong adhesiveness, it is a major component in coal blending for coking. 9. 1/3 coking coal is a transitional coal type that lies between coking coal, fat coal, and gas coal; it possesses strong cohesiveness and moderate to high volatile matter. When used alone for coking, it can produce coke with good fluidity and high strength. Therefore, it is an excellent base coal for coal blending in coking. 10. Coking coal has moderate to low volatile matter and medium to high caking property; when heated, it forms gelatinous substances with excellent stability. When used solely for coking, it produces coke that is densely structured, large in size, high in strength, resistant to wear, has few cracks, and is not prone to breaking. However, due to its high expansion pressure, it can cause difficulties in pushing coke out and damage to the furnace, so it is generally used as a coal blend for coking. 11. Thin coal has low volatiles and moderate caking property. When coked alone, it produces coke with large lumps, few cracks, and good crush resistance, but poor wear resistance. Therefore, using it in coal blending for coking can increase the size and strength of the coke. 12. Thin coal has a low volatility, weak cohesion, and poor coking properties. When coking is carried out separately, a large amount of coke dust is produced. But it can act as a slimming agent. Therefore, it can be used as coking coal, and at the same time, it is also an excellent fuel for domestic use and power generation. 13. Low-grade coal contains a certain amount of volatiles; it does not produce gums when heated, has no cohesion or only weak cohesion, results in a short combustion flame, and does not form coke during coking. It is mainly used as power and domestic fuel. In areas lacking lean materials, it can also serve as a leanening agent for coal blending in coking. 14. Anthracite is the coal with the highest degree of coalification. It has low volatile matter, high specific gravity, high hardness; it produces little smoke and a short flame when burning, with strong burning power. It is usually used as a fuel for civilian and power applications. High-quality anthracite can be used as a raw material for gasification, as fuel for blast furnaces and in the sintering of iron ore, as well as in the production of calcium carbide, electrodes, and carbon materials. This information is shared with everyone; it should be useful for work and studies! This information is shared with everyone; it should be useful for work and studies! This post was last edited by Tianya Langji on 2009-3-14 at 15:57 to improve readability