Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1983-10-13
1985-08-20
Heller, Gregory A.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423310, 423316, 423321S, 71 43, C01B 2516, C01B 1516, B21B 4502
Patent
active
045363781
ABSTRACT:
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.
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Chemical Abstracts: 79 P 32,163g; 80 P 38,864z; 81 P 65,709e; 83 P 12,906b; 83 P 62,886r; and 90 P 206,663k.
Lawver et al., "Beneficiation of South Florida Carbonate Phosphorites", ISMA Technical Conference, Oct. 1978.
Chemical Abstracts: 78 161,564n; 83 P 134,385b; 86 P 31,584y; 91 P 23,359s; 92 61,065w; 94 159,080p.
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