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National Standard for Coking Coal

2019-08-27

Fat coal: The title of bituminous coal with moderate degree of coalification and strong cohesion in China's national coal classification standards. The standard stipulates that the drying ash-free volatile matter V DAF > 10-37% and the maximum thickness of the colloid layer Y > 25mm. Fertilizer coal produces a large number of colloidal substances when heated, and the coke obtained by coking alone melts well, so it is coking coal and lean coking coal. However, there are many transverse cracks and high porosity in coke, and honeycomb coke is found at the root of coke cake. Fertilizer coal is an important component in coking blended coal. Fertilizer coal can make coke melt well, thus improving the wear resistance of coke and creating conditions for blending coal with poor cohesion or lean coal. Zhenchengdi coal in Gujiao, Shanxi Province is one of the best fertilizer coal in China.

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Main Coking Coal: In the national coal classification standards of China, the title of bituminous coal with high degree of coalification and good coking performance is given. The standard stipulates that coking coal is composed of two parts. The drying ash-free volatile components of coking coal are V DAF > 10-28%, the number of cohesive batches G > 65, and the maximum thickness of colloid layer y < 25mm. This part of coal has excellent coking property and can be coked separately. The other kind of coking coal has ashless volatile matter V DAF > 20-28%, cohesive index G > 50-65, and coking property is worse than the former. Coking coal is a typical coking coal with medium volatile matter and good cohesiveness. It can form colloidal body with good thermal stability when heated. The coke block obtained by coking alone is large, with few cracks and high mechanical strength. However, due to small shrinkage and high expansion pressure, it may cause difficult coking pushing and even cause damage to the furnace body. 。 Coking coal can play the role of coke skeleton and alleviate shrinkage stress in coking with coal, thus improving the mechanical strength of coke, and it is a high-quality coking raw material. Xiqu of Shanxi ancient Jiao is a typical type of coking coal.

1/3 Coking Coal: In China's national coal classification standards, the title of bituminous coal between coking coal and gas coal. The standard stipulates that the drying ash-free volatile of 1/3 coking coal is V DAF > 28-37%, the cohesive index G > 65, and the maximum thickness of colloid layer y < 25mm. 1/3 coking coal is mainly the coal with better coking property from gas coal in the coal classification scheme of China established in 1956. It also contains about 1/3 of coking coal in the scheme, so it is named 1/3 coking coal. When the coal is coking alone, it can produce coke of certain size and strength, so it is coking coal. 1/3 of coking coal has different properties. When G > 75 coal is heated, it can produce more colloidal substances. It has good coking property and can produce coke with higher strength separately, which is the main component of blended coal. However, the coking property of 1/3 coking coal with G < 75 is poor. High strength coke can not be obtained when coking alone, and the amount of coke used in blended coal should not be excessive.

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