Process for producing phosphoric acid using mixed acid feed and

Details Process for producing phosphoric acid using mixed acid feed and Process for producing phosphoric acid using mixed acid feed and

1976-04-08

1978-05-09

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423167, 423307, 423308, 423320, 423555, C01B 2516

Patent

active

040887383

ABSTRACT:
A method of making phosphoric acid and gypsum through a precipitated phosphate intermediary which comprises mixing a precipitated dicalcium phosphate with a highly dispersed reaction admixture of sulfuric acid and phosphoric acid, at a temperature between about 25.degree. and 80.degree. C; and withdrawing and separating phosphoric acid containing up to about 45% or more P.sub.2 O.sub.5 and gypsum containing generally less than 0.25% P.sub.2 O.sub.5. The resultant gypsum is highly filterable and very low in occluded phosphate value. Preferably, the process involves first obtaining a weak phosphoric acid solution from and by leaching as-mined phosphate mineral containing material to obtain the precipitated dicalcium phosphate; and then converting the precipitated phosphate by the process to the strong phosphoric acid solution.

REFERENCES:
patent: 1866657 (1932-07-01), Levermore
patent: 1910808 (1933-05-01), Moore
patent: 2013970 (1935-09-01), Moore
patent: 2114600 (1938-04-01), Larsson
patent: 3003852 (1961-10-01), Nordongren
patent: 3619136 (1971-10-01), Case
patent: 3715191 (1973-02-01), Rushton et al.
patent: 3803293 (1974-04-01), Randolph et al.
patent: 3919395 (1975-11-01), Hauge
patent: 3988420 (1976-10-01), Loewy et al.
patent: 4012491 (1977-03-01), Hauge

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