Calcination method and apparatus

Details Calcination method and apparatus Calcination method and apparatus

F - Mech Eng,Light,Heat,Weapons

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F27B 15/00 (2006.01) B01F 13/02 (2006.01) B01J 6/00 (2006.01) C04B 11/02 (2006.01)

Patent

CA 1141157

ABSTRACT: CALCINATION METHOD AND APPARATUS Minerals such as gypsum in powdered condition are calcined with increased thermal efficiency in a vessel having a lower region of small cross section by means of hot gas delivered by a downwardly extending tube directly into the lower region of the vessel. The preferred vessel is an inverted cone (1) and has a lid (3) which is fitted with a mineral inlet (4) and exhaust outlet (5), and through which the hot gas tube (6) passes. The hot gas may be produced in the tube by a burner (17). Discharge from the vessel is preferably through an overflow weir (11) and an internal pro- tuberance (15) may be used to assist in distributing the gas flow across the bottom of the vessel to avoid accumulation of calcined material.

342951

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