Fertilizer solutions stabilized with inorganic acids

Chemistry: fertilizers – Processes and products – Inorganic material

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71 41, 71 51, 71 53, 71 641, 71 6410, 423310, 423314, C05B 1108, C05B 1110

Patent

active

043360530

ABSTRACT:
A stable liquid fertilizer solution containing nitrogen, phosphorus, iron and optionally sulfur is prepared by mixing a water-soluble iron compound with ammonium polyphosphate and water to produce an iron phosphate slurry having a molar ratio of polyphosphate phosphorus to iron of at least about 2:1, adding ammonia to the iron phosphate slurry to produce a solubilized iron complex; and adding an inorganic acid to the iron complex solution. The amount of acid added is generally that which brings the pH of the fertilizer solution to within the range of about 5.5 to 7.0.

REFERENCES:
patent: 2769704 (1956-11-01), Andres et al.
patent: 3010818 (1961-11-01), Jones et al.
patent: 3244500 (1966-04-01), Stenson et al.
patent: 3897236 (1975-07-01), Roberts
patent: 4056381 (1977-11-01), Kenton
patent: 4063920 (1977-12-01), Weston

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