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2 217 400

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IPC

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Application

2002105276/12, 2002-02-26

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Start date

2002-02-26

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Actual filing date

2002-02-26

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Published

2003-11-27

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Inventor

Dmitrevskij B.A.Shapkin M.A.Grachev N.V.Treushchenko N.N.Mil'Berger T.G.Karpov A.V.

(73)

Holder

OaoOooDmitrevskij Boris AndreevichShapkin Mikhail Anatol'EvichGrachev Nikolaj Vasil'EvichTreushchenko Nadezhda NikolaevnaMil'Berger Teodor GeorgievichKarpov Andrej Viktorovich

METHOD FOR PREPARING COMPLEX FERTILIZERS Russian patent published in 2003 - IPC

Abstract RU 2217400 C2

FIELD: fertilizers. SUBSTANCE: invention relates to methods for preparing complex fertilizers, in part, nitrogen- phosphorus-potassium fertilizers. Method for preparing complex fertilizers involves neutralization of phosphoric acid with potassium-containing alkaline reagent, mixing the prepared pulp with sulfate-containing reagents at pH = 3.8-5.3, granulation and drying the ready product. Phosphoric acid is neutralized preliminary with phosphoric acid slime in the ratio P2O5 of slime/P2O5 of acid = (0.02-0.4): 1. Sulfuric acid and ammonium sulfate are used as sulfate-containing reagent in the ratio = H2SO4 : (NH4)2SO4 = (0.02-0.09):1. Method provides utilization of slimes obtained in treatment of phosphoric acid and rendering harmless of phosphate solutions and also ammonium sulfate that as by-side product in many chemical and petrochemical manufactures. EFFECT: improved preparing method, simplified method, reduced cost in preparing high-quality fertilizers. 3 cl, 1 tbl

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RU 2 217 400 C2

Authors

Dmitrevskij B.A.

Shapkin M.A.

Grachev N.V.

Treushchenko N.N.

Mil'Berger T.G.

Karpov A.V.

Dates

2003-11-27—Published

2002-02-26—Filed

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