GB/T 211-2017 Translated English of Chinese Standard. (GBT 211-2017, GB/T211-2017, GBT211-2017): Determination of Total Moisture in Coal
This Standard specifies the method summary, reagent and materials, apparatus, procedures, result calculation, precision and test report for the determination of total moisture in coal. The method of drying under nitrogen (Method A1 and B1) shall be applicable to all types of coals; the method of drying in air (Method A2 and B2) shall be applicable to bitumite (excluding easily oxidized coal) and blind coal. Method A1 shall be the arbitration method in this Standard.
Reagent and Materials
Precision of the Methods
Appendix A Informative Determination of Total Moisture in Coal by Drying by Microwave
13mm coal samples 5min 6mm coal 6mm sample accordance with Formula accordance with GB/T accurate to 0.001g air-drying oven allochronic silica gel ambient temperature amount of 13mm analysis test sample Analytical balance anhydrous calcium chloride blind coal bottle accurate Calculate the total calculated in accordance Conduct drying inspections constant mass continuous inspections corrected total moisture Crush the sample Determination of Total determined in accordance dry for 2h dryer drying by microwave drying in air drying under nitrogen free moisture gram g Hard Coal loss in mass mass increases mass is reached mass loss mass reduction method of drying Method Summary moisture in coal Moisture loss correction nitrogen-flushed oven Open the lid particle size percentage of moisture pre-dried and weighed previous inspection reference for calculation Remove the weighing Repeatability Limits Result calculation sample for total sample is dried spread it evenly two-stage method unit is gram weigh the bottle weighed weighing bottle