Stable ammonium polyphosphate liquid fertilizer from merchant grade phosphoric acid
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United States of America Patent
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Jan 26, 1988
Grant Date -
N/A
app pub date -
Mar 20, 1986
filing date -
Mar 20, 1986
priority date (Note) -
Expired
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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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Cited Art Landscape
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