Method and apparatus for calcining gypsum

Details Method and apparatus for calcining gypsum Method and apparatus for calcining gypsum

2006-03-14

2009-11-24

Miller, Bena (Department: 3725)

Solid material comminution or disintegration

Processes

With heating or cooling of material

C241S079100, C241S062000

Reexamination Certificate

active

07621474

ABSTRACT:
The subject invention relates generally to methods and apparatuses for calcining gypsum. The apparatuses and methods place a gypsum particle optimizer in close association with the impact mill so that all the gypsum supplied to the impact mill has to enter the gypsum particle optimizer prior to the gypsum entering the impact mill, and so that heat generated from the impact mill enters into the gypsum particle optimizer from the impact mill. The gypsum particle optimizer utilizes a rotor to disperse the gypsum throughout the gypsum particle optimizer so that the gypsum is exposed to the heat from the impact mill prior to entering the impact mill. The exposure to the heat removes free water from the gypsum prior to the gypsum entering the impact mill.

REFERENCES:
patent: 3794251 (1974-02-01), Williams
patent: 4201595 (1980-05-01), O'Neill
patent: 4947906 (1990-08-01), Schroeder
patent: 5184781 (1993-02-01), Andela
patent: 5238193 (1993-08-01), Pearce
patent: 6083465 (2000-07-01), Piasecki et al.
patent: 6880772 (2005-04-01), Schlesiger et al.

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