Explanatory notes on the key articles set forth in the National Standard GB/T40503—2021 measuring methods for secondary coal slime content in coal preparation plant

In order to enable the coal preparation plants to standardize and unify the methods for measuring the percentage (by mass) of secondary slime generated in wet cleaning process, the standard GB/T 40503—2021 measuring methods for secondary coal slime content in coal preparation plant was jointly issued by China National Administration of Market Supervision and Administration and China National standardization Management Committee on August 2021, and the standard wit go into effect on March 1, 2022. The paper presents some explanatory notes specifically on 2 methods set forth in the said standards—the method for calculation on a shift by shift basis and the method for calculation based on the statistical data given in the composite monthly testing report so as to allow the plant operators to get a better understanding and a good practice in implementation of the standard.