C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
39/46, 261/64
C04B 7/40 (2006.01) B01J 8/24 (2006.01) C04B 7/45 (2006.01) F27B 15/10 (2006.01)
Patent
CA 1115297
ABSTRACT OF THE DISCLOSURE A process and apparatus for the production of cement by calcining powder-form raw material in a fluidised bed, into which raw material, fuel, air and a recycled fraction of the calcined material are introduced, the material discharged from the fluidised bed subsequently being cooled by a stream of cooling air in a cooling zone. In a preferred embodiment before introduction into the fluidised bed, the raw material is pre- heated and precalcined with additional fuel in a precalcination zone to a deacidification level of at least 40% and preferably from 80 to 95%. From the lower region of the fluidised bed, the calcined material passes downwards into a cooling zone. Part of the cooling air stream is introduced into the fluidised bed from below and another part from the side. In a preferred embodiment the cooling zone is a packed bed of material immediately adjacent the fluidised bed.
307850
Bauer Klaus
Beyer Rudiger
Goldmann Wolf
Kreft Wilfried
Kretzer Horst
G. Ronald Bell & Associates
Polysius Ag
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