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Study of the process of production of granulated ammonium polyphosphate

Soviet Chemical Industry 14(9): 1080-1086
Study of the process of production of granulated ammonium polyphosphate
Wet-process phosphoric acid was neutralized to pH 2.0-4.2 with gaseous ammonia and the resultant ammonium polyphosphate melt was sprayed with a pneumatic jet onto a bed of recycle in an ammoniator-granulator. The melt was granulated with simultaneous booster ammoniation to pH 4.5-5.1. The ammonium polyphosphate was cooled in a drum-type cooler and screened. The product contained 58-59 wt % P2O5 and 12-13 wt % N.

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Accession: 001130400

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