Industrial analysis method allocation scheme for coal

1. In a pre-dried and weighed weighing bottle, weigh a general analytical test coal sample (1 ± 0.1) g with a particle size of less than 0.2mm, weigh it accurately to 0.000 2g, and spread it evenly in the weighing bottle.

2. Open the weighing bottle cap and put it in a drying oven that has been pre-blown and heated to (105~ 110) ° C. Under the condition of constant blowing, the bituminous coal is dried for 1h, and the anthracite is dried for 1.5h.

Note: Pre-blowing is to make the temperature uniform. Blowing can start (3~ 5) min before placing the weighing bottle containing the coal sample in the drying oven.

3. Remove the weighing bottle from the drying oven, immediately cover it, and place it in a dryer to cool to room temperature (about 20 minutes) before weighing.

4. Perform inspection drying for 30 minutes each time until the mass of the dried coal samples does not decrease by more than 0.0010g or the mass increases twice in a row. In the latter case, the mass before the mass increase is used as the basis for calculation. When the moisture is less than 2.00%, inspection drying is not necessary