Calcination apparatus
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United States of America Patent
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Apr 10, 1990
Issued Date -
N/A
app pub date -
Feb 28, 1989
filing date -
Oct 30, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns an improved method of calcining gypsum in which non-reactive hot gas is passed into contact with the gypsum from a source through a plurality of tubes extending downwardly into the gypsum. The invention also contemplates an improved apparatus which comprises a calcining kettle and a plurality of tubes connected to a common source of non-reactive hot gas and extending downwardly into the kettle and having openings in their lower regions to release the hot gas into the contents of the kettle. The invention provides a method and apparatus which produces gypsum plaster of improved quality and with less insoluble anhydrite.
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