China coal classification standard

In the long process of geological evolution, coalfields are influenced by many geological factors. Due to the differences in coal-forming times, original coal-forming materials, reduction degree and genetic types, and the coexistence of various metamorphism, the types of coal in China are diversified.

Classification criteria:

1.G & gt85, and then use y value or b value to distinguish fat coal, gas fat coal and other coals, when y >; 25.0mm, should be divided into fat coal or gas coal, such as Y "25 mm", according to the size of its Vdaf is divided into other coal reactions.

According to the classification of B value, VDAF "is 28%, tentatively b> 150% is fat coal, VDAF >: 28%, tentatively b & gt220% is fat coal or gas fat coal. If there is any contradiction between the categories divided by B value and Y value, the category divided by Y value shall prevail.

2.Vdaf & gt37%, g < 5 > coal, and then distinguish it as long flame coal or lignite by light transmittance PM.

3.Vdaf & gt37%, PM & GTFor 30%-50% coal, measure Qgr and maf again, if their values are greater than; 24MJ/kg(5739cal/g) should belong to long-flame coal.

National Standard for Coal Classification in China (GB575 1-86)