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Reactions between Phosphates and Kaolinite Decomposition Products¹

ABSTRACT

Kaolinite mixed with mono, di, or tribasic calcium phosphate or calcium carbonate was ball-milled in porcelain jars for periods of time up to 170 days. Changes in chemical reactions such as capacity to fix phosphates and the solubility of aluminum, calcium and magnesium were determined. pH values were recorded and identification of products produced by grinding was undertaken by use of X-ray and electron microscope techniques.

Correlations were found between phosphate fixation and increasing pH value, and phosphate fixation and solubility of aluminum. The addition of large amounts of the phosphate increased the rate of clay decomposition when the pH value was over 6.6. Tribasic phosphate caused a more rapid decomposition of the clay than did calcium carbonate when the pH values were in the same range. The fixation of phosphate by kaolinite is correlated with time of reaction, pH, amount of phosphate added and the amount of soluble Al₂O₃ (R₂O₃).

¹ Contribution No. 546, Department of Chemistry; No. 63, Department of Physics; No. 558, Department of Agronomy, Kansas Agr. Exp. Sta., Manhattan.

² Professor of Chemistry and Soil Chemist, Associate Professor of Physics, and Instructor of Agronomy, respectively.

Received for publication July 27, 1956. Accepted for publication October 3, 1956.