Method for calcining fine limestone powder

Details Method for calcining fine limestone powder Method for calcining fine limestone powder

1996-11-04

1997-08-05

Langel, Wayne

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423637, C01F 1106

Patent

active

056539487

ABSTRACT:
Method and apparatus for obtaining finely pulverized quicklime powder having high reactivity by calcining fine limestone powder, particularly, of particle sizes 1-100 micrometers. Coarse particles of inert substance, particularly, those having diameters of 100-1500 micrometers, are fluidized with high temperature gas to form a fluidized bed, and fine limestone powder is supplied into the fluidized bed. The fine limestone powder captured by the fluidized bed is calcined therein and the resulting quicklime powder is carried away by the stream of fluidizing gas and recovered with cyclone and bag filter. Coarse limestone may be used instead of or together with the coarse inert substance particles.

REFERENCES:
patent: 2774661 (1956-12-01), White
patent: 3862294 (1975-01-01), Engelhart et al.
patent: 4389381 (1983-06-01), Dinovo
"Pyrolysis of Yallourn Coal in a Powder-Particle Fluidized Bed", Takarada et al, Fuel, vol. 71, Oct. 1992, pp. 1087-1092.
"Reduction of Iron Oxide Fine Particles from a Converter in a Powder-Particle Fluidized Bed", Takarada et al, Chemical Engineering Reports, vol. 19, No. 3, pp. 505-510.
"Effective Dry Desulfurization by a Powder-Particle Fluidized Bed", Kato et al, Journal of Chemical Engineering of Japan, vol. 27, No. 3, (1994), pp. 276-278.

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