Process for the simultaneous manufacture of phosphoric acid or t

Details Process for the simultaneous manufacture of phosphoric acid or t Process for the simultaneous manufacture of phosphoric acid or t

1976-03-02

1977-02-08

Spear, Jr., Frank A.

Chemistry: fertilizers

Processes and products

Inorganic material

71 43, 71 47, 423319, 423320, C05B 100, C05B 1108

Patent

active

040070301

ABSTRACT:
In the process according to the invention, raw phosphate rock is decomposed with an aqueous solution of sulfuric acid and ammonium sulfate recycled from the conversion step of phosphogypsum into chalk, and then the decomposition liquor stream is divided into a partial acid plant stream (Liquor I) to be converted into phosphoric acid and a partial fertilizer plant stream (Liquor II) to be processed to a multi-component mineral fertilizer. From the acid plant stream (Liquor I) constituting up to 30 per cent by weight of the total decomposition stream, ammonium sulfate is precipitated and introduced into the fertilizer plant stream (Liquor II), all the above mentioned processes of decomposition, separation and precipitation being carried out continuously.
Another embodiment of the process according to the invention, wherein the partial acid plant stream (Liquor I) constitutes a partial phosphate plant stream; the said stream comprising aqueous-organic solvent phosphoric acid solution after precipitation of impurities is neutralized with ammonia, alkali metal hydroxides or alkali metal carbonates to yield crystalline phosphate salts of high purity and a homogeneous mixture of organic solvent and water which may be easily separated by distillation.

REFERENCES:
patent: 2857262 (1958-10-01), Graham
patent: 2942967 (1960-06-01), Caldwell
patent: 3172751 (1965-03-01), Datin
patent: 3241944 (1966-03-01), Takeda et al.
patent: 3697246 (1972-10-01), Drechsel et al.

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