Stabilization of wet-process phosphoric acid

Details Stabilization of wet-process phosphoric acid Stabilization of wet-process phosphoric acid

1975-11-10

1977-09-13

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423321R, C01B 2516, C01B 2522, C05B 700

Patent

active

040482898

ABSTRACT:
Impure wet-process phosphoric acid is stabilized against sludge formation by adding to a solution of said acid about 0.1 to 1% by weight of an inorganic oxidizing agent and about 0.1 to 1% by weight of silica, aging the thus treated solution concentrated to a P.sub.2 O.sub.5 content of 35% to 42% by weight for a time sufficient to form a solid phase and a substantially solid-free liquid phase of phosphoric acid improved in stability and separating the liquid and solid phases.

REFERENCES:
patent: 2799557 (1957-07-01), Seyfried et al.
patent: 2987376 (1961-06-01), Gloss
patent: 3141734 (1904-07-01), Ditlinger
patent: 3151941 (1964-10-01), Hollingsworth et al.
patent: 3505013 (1970-04-01), Araki et al.
patent: 3512927 (1970-05-01), Betts
patent: 3528771 (1970-09-01), Shearon et al.

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