METHOD FOR PRODUCING UREA-(NH4)3 PO4 COMPOUND FERTILIZER

METHOD FOR PRODUCING UREA-(NH4)3 PO4 COMPOUND FERTILIZER

Raw phosphoric acid dihydrate produced by wet method from/medium or low grade phosphours rock, containing about 20% P2O5, 4-5% impurities of Fe2O3, Al2O3, MgO, such inferior phosphoric acid can be neutralized with aminonia, and urea is then add to make the weight ratio of phosphoric acid to urea 100...

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Bibliographische Detailangaben
Hauptverfasser: TAN GUANGXUN, TONG YUNQING, SU YUGUANG
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
FERTILISERS
FERTILISERS CHARACTERISED BY THEIR FORM
MANUFACTURE THEREOF
METALLURGY
MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05
MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS
NITROGENOUS FERTILISERS
PHOSPHATIC FERTILISERS
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Zusammenfassung:Raw phosphoric acid dihydrate produced by wet method from/medium or low grade phosphours rock, containing about 20% P2O5, 4-5% impurities of Fe2O3, Al2O3, MgO, such inferior phosphoric acid can be neutralized with aminonia, and urea is then add to make the weight ratio of phosphoric acid to urea 100:35, while keeping the temperature below 100 deg.C, in this way we obtain urea-(NH4)3 PO4 compound fertilizer. Such fertilizer contains appropriate proportion of nitrogen and phorphoncs, and this proportion can be adjusted according to the demand of different soil and crop, so it overcomes the disadvantoge of lower contents of nitrogen and phosphorus.