Common knowledge of coal classification and classification

Common knowledge of coal analysis, coal testing and coal quality inspection

According to current national standards, ash is used as the standard for dividing coal grades. Coal with an ash content of less than 12.5% ​​is called coking coal for smelting; coal with an ash content of 12.5% ​​-16% is called other refined coal. Thermal coal.

The grade of coking coal for smelting is A = 5.01% -5.5% as first-grade clean coal, 0.5% ash is divided into a grade difference, and then rises in turn, divided into fifteen levels, such as A = 5.51% -6.0% is second-grade clean coal ; For other coking clean coal, take A = 12.51% -13% as the first grade Other clean coal, with 0.5% ash is divided into a grade difference, and rise in turn, divided into seven grades, such as A = 13.01% -14% is the second grade Other clean coal, etc. The thermal coal classification takes A = 4.01% -5% as the first-grade thermal coal, and 1% ash is divided into a grade difference, and then rises to A = 40%, which is divided into 36 levels, such as mixed coal A = 20% 21%, for 17th-grade thermal coal, etc.