GB/T 7702.15-2008Test method for granular activated carbon from coal - Determination of ash content (English PDF)

4.2

electric oven, 0 °C ~ 300 °C.

4.3

dryer, built-in color gel or anhydrous calcium chloride.

4.4

cupel, porcelain, rectangular, base length 45mm, bottom width 22mm, height 14mm.

4.5

muffle furnace.

Preparation 5 samples 5.1 by quartering to take 5g ~ 10g sample, the sample was crushed and all through the 1.00mm sieve test.

5.2

The sample was placed in 150 °C ± 5 °C electric oven, and dried in a desiccator 2h, cooled to room temperature before use.

6 measuring step 6.1 cupel placed in a muffle furnace at 800 °C ± 25 °C burning about 1h, taken out into the dryer, cooled to room temperature and weigh (fine

Indeed to 0.0001g), repeat until constant burning.

6.2

Weigh 1g ± 0.1g sample (accurate to 0.0001g), evenly distributed in the gray dish.

6.3

cupel placed about 300 °C muffle furnace, shut the door, open the vents (such as not leaving the door vents can be left 15mm

Right gap), in less than 30min time the furnace temperature was slowly raised to 500 deg.] C, and maintained at this temperature for 30min, warmed to continue

800 °C ± 25 °C, and at this temperature burning 1h.

6.4

cupel removed from the furnace and placed on a heat resistant porcelain or asbestos, cooling the air around 5min, cooled to room temperature in a desiccator (About 20min) after weighing.

Burning 6.5 per 20min after weighing once, until the change in mass of not more than 0.0010g so far.