Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1985-03-08
1986-06-03
Doll, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
432 14, 432 15, C01B 2526
Patent
active
045929009
ABSTRACT:
A method of removing cadmium from raw phosphate material in an apparatus comprising a preheater section (2,13) a reactor section (3,4,5), a cooler section (7) and an exit gas cleaning section having a cadmium condenser (6,20,21), where the reactors (3,5) work in series and are formed as suspension reactors, or alternatively as a suspension reactor and a fluid-bed reactor, and where the treated raw phosphate in the first reactor having a short material retention time is suspended in a gas/fuel mixture and through a flash-process heated to a reaction temperature of 750.degree.-1050.degree. C. to be further heated subsequently in a reducing or neutral atmosphere in the second reactor which has a strongly reduced gas supply as compared with the first reactor and has at least three times as long a material retention time, by which the cadmium content is substantially expelled from the raw phosphate and carried away with the exit gas from the second reactor, while the cleaned phosphate is passed to the cooler section of the plant for further treatment.
REFERENCES:
patent: 4017585 (1977-04-01), Angevine et al.
patent: 4321238 (1982-03-01), Henin
patent: 4555388 (1985-11-01), Hundebol
Doll John
F. L. Smidth & Co. A/S
Langel Wayne A.
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