Stable ammonium polyphosphate liquid fertilizer from merchant gr

Chemistry: fertilizers – Processes and products – Inorganic material

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71 43, 423313, 423321R, C05B 700

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active

047215194

ABSTRACT:
A stable ammonium polyphosphate liquid fertilizer is prepared from concentrated wet-process phosphoric acid of 54-62% P.sub.2 O.sub.5, which prior to concentration is treated with a cation exchange resin to remove magnesium and calcium without appreciable reduction of iron and aluminum. The liquid fertilizer will remain substantially sludge-free when stored at 25.degree. C. for six months without the addition of any sequestering or suspending agent.

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CA 98(24): 200608q, Gafurov et al, 1983.
CA 88(8): 52552t, Melamed et al, 1976.
Frazier et al., J. Agr. Food Chem. (1966) 14:522-529.
Frazier et al., "Stabilizing Liquid Fertilizer with Fluorine Compounds" in Fertilizer Solutions, Issue Jul.-Aug. 1972.
Lehr, et al., J. Agr. Food Chem. (1966) 14:27-33.

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