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Table 2 Average particle size color and grind condition of attapulgite at different calcination temperatures.

From: Calcined Attapulgite Clay as Supplementary Cementing Material: Thermal Treatment, Hydration Activity and Mechanical Properties

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