Fluid bed calcination process

Details Fluid bed calcination process Fluid bed calcination process

1974-10-29

1977-04-12

Peters, G. O.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

23262, 23277R, 23284, 423319, 423320, 432 15, 432 58, C01B 2516

Patent

active

040175855

ABSTRACT:
Phosphate rock is calcined under conditions calculated to completely oxidize the carbon and sulfur in the rock. Calcination is also conducted at elevated temperature to eliminate cadmium metal, a poisonous substance in fertilizers, from the calcined rock product. A fluid bed system for eliminating cadmium metal in the calcination of phosphate rock involves a two-vessel system in which an independent cadmium removal vessel served by a separate fluidizing air stream carries out volatilization of cadmium, while preheating, precalcining and cooling is conducted in another multi-bed reactor which is served by a separate fluidizing air stream.

REFERENCES:
patent: 1032763 (1912-07-01), Newberry et al.
patent: 2675307 (1954-04-01), Klugh et al.
patent: 3617242 (1971-11-01), Hollingsworth
patent: 3758266 (1973-09-01), Retali et al.
patent: 3872211 (1975-03-01), Wall

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