METHOD FOR PREPARING COMPLEX FERTILIZERS

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SHAPKIN M.A, KARPOV A.V, GRACHEV N.V, MIL'BERGER T.G, DMITREVSKIJ B.A, TREUSHCHENKO N.N
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	CHEMISTRY FERTILISERS FERTILISERS CHARACTERISED BY THEIR FORM MANUFACTURE THEREOF METALLURGY MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05 MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS
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Beschreibung
Zusammenfassung:	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