Process and apparatus for purifying wet-processed phosphoric aci

Details Process and apparatus for purifying wet-processed phosphoric aci Process and apparatus for purifying wet-processed phosphoric aci

1977-07-13

1979-01-16

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2518

Patent

active

041349644

ABSTRACT:
Process and apparatus for purifying crude wet-processed phosphoric acid containing free sulphuric acid. To this end, the wet-processed phosphoric acid is treated in a reaction zone, at a temperature of 70.degree. C to 100.degree. C, with a calcium compound and with calcium sulphate seed crystals; the sulphuric acid is precipitated in the form of calcium sulphate semihydrate with the resultant formation of a suspension; a proportion of the suspension, with the calcium sulphate semihydrate seed crystals present therein, is recycled to the reaction zone; the balance of the suspension is treated for separation of purified phosphoric acid from the accompanying precipitate; the precipitate is transformed into an aqueous suspension and the calcium sulphate semihydrate in said suspension is converted into calcium sulphate dihydrate; the aqueous phase of the suspension is separated from the solid matter therein, and the solid matter is water-washed; a proportion of the aqueous phase so separated is recycled together with a proportion of the wash water, for use in suspending and converting calcium sulphate semihydrate to dihydrate; and the balance of the aqueous phase and wash water are combined with the said purified phosphoric acid.

REFERENCES:
patent: 1787192 (1930-12-01), Fiske
patent: 1836672 (1931-12-01), Larsson
patent: 2885263 (1959-05-01), Peet
patent: 2885264 (1959-05-01), Peet
patent: 3186793 (1965-06-01), Gillis et al.
patent: 3453076 (1969-07-01), Long et al.
patent: 3494736 (1970-02-01), Carothers et al.
patent: 3505013 (1970-04-01), Araki et al.
patent: 3552918 (1971-01-01), Fitch et al.
patent: 3632307 (1972-01-01), Es

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