Process for working up phosphoric acid

Details Process for working up phosphoric acid Process for working up phosphoric acid

1990-04-12

1990-11-20

Langel, Wayne A.

Chemistry of inorganic compounds

With additive

Additive contains metal, boron, or silicon

423309, 423311, 423321R, C01B 2532

Patent

active

049717782

ABSTRACT:
For working up concentrated, preferably partially condensed phosphoric acid which is contaminated with organic components, the phosphoric acid is first thoroughly mixed with fine-grained sand in a weight ratio of (0.5 to 1.5):1. Then, to neutralize the mixture, a basic, oxygen-containing calcium compound is added, while the thorough mixing is continued, until a 10% aqueous suspension of the mixture to which the calcium compound has been added has a pH between 5 and 11. Finally, the mixture which contains the calcium compound is commminuted after cooling.

REFERENCES:
patent: 2132349 (1938-10-01), Booth
patent: 3193331 (1965-07-01), Miller et al.
patent: 3450633 (1969-06-01), Siemers
patent: 4160657 (1979-07-01), Drechsel
patent: 4164550 (1979-08-01), Hill
patent: 4330517 (1982-05-01), Michalski
patent: 4347228 (1982-08-01), Wolstein et al.
patent: 4466948 (1984-08-01), Schimmel et al.
patent: 4713229 (1987-12-01), Schimmel et al.

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