Calciner for fine limestone

Details Calciner for fine limestone Calciner for fine limestone

1977-02-28

1978-12-05

Camby, John J.

Heating

With heating gas conveying, agitating, scattering or...

432 78, F27B 1500

Patent

active

041283929

ABSTRACT:
A method and apparatus for calcining finely divided material such as limestone and dolomite. The apparatus is especially useful for calcining materials having a size of less than 1/4 inch. The apparatus includes a first stage fluidized bed calcining apparatus and a second stage flash calcining apparatus. Raw material is supplied to the fluid bed reactor. The large particles are calcined within this reactor, withdrawn from the reactor and supplied to a cooler. The fines are elutriated with the spent fluidizing gas and supplied to a cyclone separator. The separated fines are supplied to a flash calciner where they are calcined. The separated spent fluidizing gases may be used as combustion gas in the flash calciner. The calcined fines are removed from the flash calciner and supplied to a cyclone separator and from there to a cooler.

REFERENCES:
patent: 2932498 (1960-04-01), Metcalfe et al.
patent: 3595542 (1971-07-01), Ashmann
patent: 3932117 (1976-01-01), Ritzmann

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