Oxidation of phosphoric acid plus K compound addition

Details Oxidation of phosphoric acid plus K compound addition Oxidation of phosphoric acid plus K compound addition

1980-11-28

1981-11-17

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423317, C01B 2516

Patent

active

043011314

ABSTRACT:
This invention is directed to an improvement in the Hill phosphoric acid process, whereby the Hill process can be used with high-iron phosphate rock. The improvement involves oxidation of divalent iron in an early stage of the Hill process, followed by addition of a soluble potassium compound to the acid in the crystallizer.

REFERENCES:
patent: 2799557 (1957-07-01), Seyfried et al.
patent: 2968528 (1961-01-01), Tuttle et al.
patent: 3310374 (1967-03-01), Posey et al.
patent: 3338675 (1967-08-01), Gilbert
patent: 3845198 (1974-08-01), Marcot
patent: 3907680 (1975-09-01), Hill
patent: 4044108 (1977-08-01), Kikuchi et al.
patent: 4048289 (1977-09-01), Pierres
patent: 4110422 (1978-08-01), Hill
patent: 4164550 (1979-08-01), Hill
patent: 4209497 (1980-06-01), Irani et al.
U.S. Ser. No. 427,383, 12-21-73, Pierres.

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