Method and apparatus for calcination

Details Method and apparatus for calcination Method and apparatus for calcination

C - Chemistry, Metallurgy

04

B

23/103, 39/46

C04B 11/02 (2006.01) B01J 8/26 (2006.01) C04B 11/028 (2006.01) F27B 15/00 (2006.01)

Patent

CA 1313748

- 0 - IMPROVEMENTS IN METHOD AND APPARATUS FOR CALCINATION ABSTRACT OF THE DISCLOSURE In a method and apparatus for the heat treatment of gypsum or like heat material, in which the material is heated in a vessel by indirect heat exchange with hot gas produced by the fluidised combustion of a fuel, material is fed into a first fluidised bed of the material. Partially treated material is removed from the lower region of the first bed and introduced with the assistance of compressed air into the upper region of a second fluidised bed. Treated material is removed from the second bed. The beds of material are both fluidised by means of the introduction of the hot gas product of the fluidised combustion bed, further heating the beds. The first bed may be operated at a lower temperature than the second bed, although both beds may receive substantially the same heat input.

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