Cristobalite-free mullite grain and method of producing same
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United States of America Patent
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Sep 7, 1999
Grant Date -
N/A
app pub date -
Jul 23, 1997
filing date -
Jul 23, 1997
priority date (Note) -
Expired
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Abstract
A method of calcining kaolin, comprising the steps of: a) producing a clay slurry comprised of water and kaolin clay of a specific particle size; b) mixing a water insoluble potassium containing glass forming compound into the clay slurry in an amount wherein the potassium content of the slurry is equal to about 1% by weight of the kaolin clay in the slurry; c) removing sufficient water from the slurry to form a material having an extrudable consistency; d) extruding the material into elongated shapes; e) heating the shapes by continuously moving them through a furnace having a zone, wherein the material is exposed to temperatures of at least 2700.degree. C. for at least 30 minutes.
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