by absorbing water. This is irreversible, as are subsequent transformations; this is referred to as calcination.

Metakaolin

Endothermic dehydration of kaolinite begins at 550-600 °C producing disordered metakaolin, but continuous hydroxyl loss is observed up to 900 C. Although historically there was much disagreement concerning the nature of the metakaolin phase, extensive research has led to a general consensus that metakaolin is not a simple mixture

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