Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent
1989-02-28
1990-04-10
Yuen, Henry C.
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
432197, 432 14, 422114, F26B 918, B01J 600
Patent
active
049156233
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.
REFERENCES:
patent: 1234240 (1917-07-01), Wiederwax
patent: 2464304 (1949-03-01), Gottlieb
patent: 4529374 (1985-07-01), Malik et al.
patent: 4576573 (1986-03-01), Ruehenbeck
patent: 4615867 (1986-10-01), Heckman
Ball David J.
Curtis Philip
Dzidrums Martin
Varney Edward
Lorenzen John M.
Robinson Robert H.
United States Gypsum Company
Yuen Henry C.
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