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US 4,536,378 AGranted
Phosphate fertilizer production
OwnerEdward A. Whiteinventor
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OwnerEdward A. Whiteinventor
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Processes for the preparation of phosphoric acid, such as merchant phosphoric acid, and for the provision of phosphoric acid suitable for the preparation of ammonium phosphates, are disclosed. Such processes comprise providing a source stream of phosphoric acid comprising more than about 30% P.sub.2 O.sub.5, said source stream having impurities, and removing from the source stream a minor proportion, 20% or less, to form a treatment stream. The level of impurities in the treatment stream is reduced employing any of the means known to those skilled in the art, especially solvent extraction. At least a portion of the treated treatment stream is combined with the balance of the source stream to form a product stream. The treated treatment stream and source stream are proportioned so as to render the product stream less susceptible to post-precipitation than the source stream. Through employment of the processes of the present invention, it is also possible to provide ammonium phosphate including diammonium phosphate having improved adherence to product specification than heretofore. Through employment of the processes of the present invention, it is also possible to provide phosphoric acid having a reduced tendency to form and precipitate solids during concentration and immediately after concentration and cooling.
A process for the preparation of phosphoric acid comprising:
A process for the preparation of phosphoric acid comprising:
A process for the preparation of phosphoric acid comprising:
Dependencies are inferred from the claim text.