Table 2 Average particle size color and grind condition of attapulgite at different calcination temperatures.
Attapulgite sample | Calcination temperature | Average particle size/μm | Color | Grind condition |
|---|---|---|---|---|
AT00 | No calcination | 6.81 | White grey | – |
AT200 | Calcination at 200 ℃ | 11.90 | Grey | – |
AT300 | Calcination at 300 ℃ | 11.82 | Yellowish–grey | – |
AT400 | Calcination at 400 ℃ | 12.39 | Yellow pale | – |
AT500 | Calcination at 500 ℃ | 10.28 | Yellow mid | – |
AT600 | Calcination at 600 ℃ | 5.38 | Orange–yellow | Easy grind |
AT700 | Calcination at 700 ℃ | 6.57 | Orange | Easy grind |
AT800 | Calcination at 800 ℃ | 3.33 | Black grey | Difficult grind |