Phospho-gypsum recovery process

Details Phospho-gypsum recovery process Phospho-gypsum recovery process

1986-08-25

1988-03-29

Heller, Gregory A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423240, 423304, 423320, 423483, 423490, 423522, 423541R, C01F 100, C01F 510, C01F 2516

Patent

active

047342722

ABSTRACT:
This disclosure involves a process for treating wet phospho-gypsum, a by-product from wet phosphoric acid manufacture, to remove fluorine values so as to make the sulfur values in the phospho-gypsum usable in making sulfuric acid in a contact sulfuric acid plant. The process involves drying the phospho-gypsum at 400.degree.-600.degree. C. to vaporize the fluorine values, the P.sub.2 O.sub.5 values and water and reacting the hot vapors with lime or limestone to remove the fluorine values as fluorspar. The P.sub.2 O.sub.5 values are subsequently condensed and used in a phosphoric acid plant. The dry phospho-gypsum is heated to 1200.degree.-1250.degree. C. under reducing conditions to produce SO.sub.2 gas and siliceous lime. The SO.sub.2 is then passed through a lime or limestone scrubber to eliminate any remaining fluorine values, dried and utilized in a contact sulfuric acid plant.

REFERENCES:
patent: 2528103 (1950-10-01), Willson
patent: 4472363 (1984-09-01), Poller et al.
patent: 4548797 (1985-10-01), Sauer et al.
patent: 4608238 (1986-08-01), Wilson et al.

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