Discussion
State whether the following is true or false.
Mullite can form during the firing of a clay body rather than being added as a raw material.
Answer: D
Metakaolin converts to mullite above about a thousand degrees, so the mineral appears without anyone having supplied it. Refractory formulations may add mullite as well where more of it is wanted. In-situ formation is a considerable convenience in fireclay refractories.
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