950-1050C (1742-1922F)
Metakaolin converts to spinel phase
As kaolin is calcined past the metakaolin stage (400-600C) it goes through an exothermic re-crystallization to form a spinel intermediate phase.
Related Information
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| Temperatures | Dehydroxylation in kaolin, ball clay (450-650) |
| Temperatures | Spinel phase meta kaolin converts to mullite (1050-1200+) |
| Minerals |
Mullite
Mullite (3Al₂O₃·2SiO₂) is a naturally occurring aluminum silicate crystalline mineral. It forms in h |
| Materials |
Mullite
A highly refractory low-expansion alumino-silicate crystal formed naturally only rarely but produced industrially and within fired kaolin bodies. |