Alpha-type calcium sulfate hemihydrate compositions and methods of making same
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United States of America Patent
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Feb 26, 2008
Grant Date -
Sep 1, 2005
app pub date -
Mar 15, 2005
filing date -
Mar 20, 2003
priority date (Note) -
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Abstract
Disclosed is an improved alpha-type calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO.sub.4.1/2H.sub.2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihydrate (CaSO.sub.4O.2H.sub.2O) into a briquette, calcining the briquette to transform the calcium sulfate dihydrate to calcium sulfate hemihydrate [alpha-type], drying the calcium sulfate hemihydrate [alpha-type] briquette, and optionally grinding the briquette. Also disclosed are methods of producing an improved gypsum plaster including producing the disclosed powdered calcium sulfate hemihydrate [alpha-type] and mixing the powdered calcium sulfate hemihydrate [alpha-type] with water.
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