Premium
Reactions between Phosphates and Kaolinite Decomposition Products
Author(s) -
Perkins Alfred T.,
Dragsdorf R. Dean,
Bhangoo Mahendra S.
Publication year - 1957
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1957.03615995002100020006x
Subject(s) - phosphate , kaolinite , chemistry , solubility , calcium , inorganic chemistry , calcium carbonate , magnesium , decomposition , nuclear chemistry , dissolution , phosphate minerals , mineralogy , organic chemistry
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 Al 2 O 3 (R 2 O 3 ).