Calcination apparatus

Details Calcination apparatus Calcination apparatus

1989-03-02

1991-04-30

Pal, Asok

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423170, 423172, 423555, F27B 1500, C04B 1100, C04B 1102

Patent

active

050116681

ABSTRACT:
In a method and apparatus for calcining calcium sulphate dihydrate or like heat sensitive material, in which a bed of the material is heated in a vessel (41) by the direct introduction of a hot gas through a tube (21) extending downwardly into the bed, the proportion of insoluble anhydrite (II) in the product is reduced by lowering the temperature of the hot gas before it contacts the material of the bed. This is done by indirect heat exchange through the wall of the tube 21 with a relatively cool substance, for example, powdered gypsum or recycled exhaust gases, in an outer tube (26). The cooling material in the outer tube contacts the material in the bed before the latter is contacted by the hot gas.

REFERENCES:
patent: 2647738 (1953-08-01), Trainer
patent: 3542347 (1970-11-01), Goldney et al.
patent: 4238238 (1980-12-01), Kinkade et al.
patent: 4455285 (1984-06-01), Watkins et al.
patent: 4626199 (1986-12-01), Bounini
patent: 4629419 (1986-12-01), Ward et al.

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