System and method for calcining gypsum

Details System and method for calcining gypsum System and method for calcining gypsum

2011-03-01

2011-03-01

Vanoy, Timothy C (Department: 1734)

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C106S772000, C422S129000, C422S187000, C422S232000, C422S234000

Reexamination Certificate

active

07897134

ABSTRACT:
A system (100) for calcining natural gypsum, synthetic gypsum (112) or a combination thereof, the system including: a mill (114) for grinding and drying natural gypsum, synthetic gypsum (112) or a combination thereof, to produce dried gypsum (116); a flash calciner (118) for calcining the dried gypsum to produce an exhaust gas (130) and calcined gypsum (128); and a mechanism (134) for transporting at least a portion of the exhaust gas (130) produced by the flash calciner (118) to an air heater (126) that supplies hot gas (126a) to the flash calciner (118).

REFERENCES:
patent: 3956456 (1976-05-01), Keller et al.
patent: 4569831 (1986-02-01), Cohen
patent: 5437850 (1995-08-01), Kroehl et al.
Article: “New Literature on Raymond IMP Mills”, by ALSTOM Power Inc., Mar. 19, 2004.
Kreft W: “Thermal treatment of mineral raw materials by the cross-flow process - Process engineering and product application”, vol. 41, n0. 9 Sep. 1, 1988.
PCT International Search Report and The Written Opinion of the International Searching Authority dated Oct. 12, 2010 (PCT/US2010/039564).

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