United States Gypsum Company

Donald R Janninck

William F Porter

Larbi Bounini

Richard F Stone

Otto L Dozsa

Hydrodynamic pumping of the fluidized calcining mass in a kettle is set up by the continuous flow of the mass to and from heating rods immersed therein which are constantly emitting at least about 1 British Thermal Unit of heat per minute per square inch of the surface of the rods. The transfer of heat from the walls and bottom of the kettle is enhanced so that more of the available heat is actually absorbed than in a kettle lacking such heating rods. The rate of calcination may be increased while the rate of heat input is decreased.

Highly efficient calcination of gypsum to hemihydrate

An apparatus for producing mineral fibers comprising a container having means for heating the mineral material to form a molten pool therein, a plurality of discs having a portion thereof immersed in the molten pool, and means for rotating the discs in the same angular direction at high speed. In a preferred embodiment means are provided for moving a gas such as air or steam across the edges of the rotating discs to assist in the attenuation of the fibers.

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Chicago, IL, United States of America

Donald R Janninck