C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
23/103, 39/34, 2
C04B 11/02 (2006.01) C04B 11/028 (2006.01) F27B 15/00 (2006.01) F27B 17/00 (2006.01)
Patent
CA 1082423
ABSTRACT OF THE DISCLOSURE A continuous calciner, particularly advantageous in converting gypsum to plaster, with two coaxial cylin- drical walls, provides for heating air within the inner cylinder and then directing the air, for conveying and heating fine particles, along a spiral path, between the walls of the two coaxial cylinders, extending from one end of the calciner to an exit at the second end.
274949
National Gypsum Company
Osler Hoskin & Harcourt Llp
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