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

ABSTRACT

Aluminum hydroxide is the principal reagent in the precipitation of phosphate from fertilizers in acid soils. Iron oxide is much less reactive unless it is very finely divided. In cold phosphate solutions, clay minerals are stable in comparison with hydrated iron and aluminum oxides. The amounts of dicalcium phosphate, calcium aluminum phosphate, and amorphous aluminum phosphate that are precipitated when gibbsite dissolves in potassium-free acidic calcium phosphate solutions depend upon the rate of dilution of the solution. Amorphous ferric phosphate and calcium ferric phosphate are formed during the dissolution of goethite, but, unless the soil contains a large amount of reactive iron oxide, most of the phosphate will be precipated as aluminum compounds.

¹ Contribution from the Fundamental Research and Soils and Fertilizer Research Branches, Office of Agricultural and Chemical Development, TVA, Wilson Dam, Ala.

² Research Chemists and Research Chemist (Soils), respectively. E. C. Moreno is now with the American Dental Association Research Division, National Bureau of Standards, Washington, D. C.

Received for publication May 2, 1963.