Production of mixed fertilizers from crude phosphates

Details Production of mixed fertilizers from crude phosphates Production of mixed fertilizers from crude phosphates

C - Chemistry, Metallurgy

05

B

71/27

C05B 13/02 (2006.01)

Patent

CA 1080499

ABSTRACT OF THE DISCLOSURE Crude phosphate is leached with nitric acid to produce an acid slurry, which is thereafter neutralized with ammonia in two successive stages while simultaneously cooling it and adding acid, part of the crude phosphate phosphorus being replaced with phos- phoric acid added to the slurry to be neutralized, and in such a manner that at maximum 40 % of the phosphoric acid is fed to the first neutralization stage and the rest is fed to the second neutralization stage, whereby the acidity of the slurry is ad- justed to pH 2.5 - 4.5 during the first and to pH 5.0 - 6.0 during the second neutralization stage.

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