Heating – With heating gas conveying – agitating – scattering or...
Patent
1976-01-28
1977-11-22
Camby, John J.
Heating
With heating gas conveying, agitating, scattering or...
432106, 432168, F27B 1500
Patent
active
040593924
ABSTRACT:
A method of heat treating a preheated, pulverous, raw material consisting of or containing lime, such as cement raw meal. By mixing at least part of the preheated raw material intimately with a fuel capable of carrying out at least a partial calcination, a suspension of raw material in a combustible gas is provided. Upon providing a flow of oxygen-containing gas in contacting relation with the suspension of gas/material, at least a partial calcination takes place according to an endothermic process in which calcium carbonate is dissociated into calcium oxide and carbon dioxide. A finishing calcination and/or other heat treatment may follow the calcination process. When the raw material is cement raw meal, the aforesaid finishing heat treatment following the calcination is a sintering by which cement clinker is produced according to an exothermic process. A unique calcination plant is disclosed for at least partially calcining a preheated pulverous, raw material according to the present method wherein by a supply of heat before the material is subjected to a finishing calcination and/or other heat treatment, if any, at least a partial calcination may be performed approximately isothermically and at a relatively low temperature.
REFERENCES:
patent: 3022989 (1962-02-01), Pyzel
patent: 3617037 (1971-11-01), Foch
patent: 3834860 (1974-09-01), Fukuda
patent: 3881857 (1975-05-01), Hoy
patent: 3904353 (1975-09-01), Bosshard et al.
patent: 3925024 (1975-12-01), Hollingsworth et al.
patent: 3932117 (1976-01-01), Ritzmann
Camby John J.
F. L. Smidth & Co.
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