Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1984-08-16
1987-06-16
Doll, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
C01B 2516
Patent
active
046735550
ABSTRACT:
Phosphate rock is defluorinated by blending with phosphoric acid and a sodium defluorination reagent sufficient to give 5 to 9 percent Na.sub.2 O based on the weight of rock and a mole ratio of CaO plus Na.sub.2 O to P.sub.2 O.sub.5 of 3.00, granulating the blend and introducing the blend into a fluidized bed calcination apparatus having at least a first and second reaction zone, each zone being maintained at a temperature above 1050.degree. C., calcining the blend in the first zone in the presence of water vapor to remove a substantial portion of the fluorine from the blend and further calcining the blend in the subsequent zone or zones in an atmosphere containing sufficient air added in excess of that air required for combustion or water vapor instead of that air to reduce the fluorine content of the blend to a value of less than about 0.18 weight percent while maintaining the phosphorus to fluorine weight ratio in excess of about 100. The defluorinated phosphate is cooled and stored for use such as an animal feed supplement.
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Doll John
Langel Wayne A.
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