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Precipitation of Phosphate by Iron Oxide and Aluminum Hydroxide from Solutions Containing Calcium and Potassium
Author(s) -
Taylor A. W.,
Gurney E. L.
Publication year - 1965
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/sssaj1965.03615995002900010008x
Subject(s) - phosphate , precipitation , dissolution , chemistry , inorganic chemistry , potassium hydroxide , hydroxide , potassium , calcium , calcium hydroxide , aluminium , potassium phosphate , nuclear chemistry , chromatography , biochemistry , organic chemistry , physics , meteorology
When acidic calcium phosphate solutions such as those formed by the dissolution of fertilizers react with aluminum hydroxide in the presence of little potassium, all the potassium is precipitated as taranakite, K 3 Al 5 H 6 (PO 4 ) 8 ·18H 2 O; most of the rest of the phosphate is precipitated as aluminum and calcium aluminum phosphates. In the presence of considerable potassium, the precipitation of phosphate is governed by the initial composition of the solution; as much as 25% of the phosphate is precipitated as dicalcium phosphate and most of the rest is precipitated as taranakite. Iron oxide reacts much more slowly with phosphate than aluminum hydroxide and has much less effect on the precipitation of phosphate.