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Precipitation of Phosphate from Ammonium Phosphate Solutions by Iron Oxide and Aluminum Hydroxide¹

ABSTRACT

Addition of gibbsite, Al(OH)₃, to ammonium phosphate solutions with a pH below 5.4 precipitates ammonium taranakite, (NH₄)₃Al₅H₆(PO₄)₆·18H₂O. At pH above 5.4, (NH₄)₂AlH(PO₄)₂·4H₂O is formed. In acid soils monoammonium phosphate solutions produce a mixture of these salts together with amorphous aluminum phosphate. Addition of gibbsite to diammonium phosphate solution produces NH₄AlPO₄(OH)·2H₂O on dilution, but this salt forms slowly and is unlikely to exist in significant amounts in the soil. Iron oxide reacts very little with ammonium phosphate solutions at any pH.

¹ Contribution from the Fundamental Research Branch, Division of Chemical Development, TVA, Wilson Dam, Ala.

² Research Chemists.

Received for publication September 28, 1964. Accepted for publication December 14, 1964.