METHOD OF MANUFACTURING GRANULATED MINERAL FERTILIZER CONTAINING NITROGEN AND PHOSPHORUS; AND GRANULATED MINERAL FERTILIZER Russian patent published in 2005 - IPC

FIELD: mineral fertilizers.

SUBSTANCE: method of manufacturing complex granulated mineral fertilizer consists in mixing ammonium nitrate and monoammonium phosphate-containing phosphate additive. The latter is granulated mineral double fertilizer simultaneously containing ammonium nitrate, monoammonium phosphate, and calcium phosphates at total content of digestible phosphorus 13÷21% (calculated as P₂O₅). Additive is introduced by way of melting it followed by admixing resulting melt to molten ammonium nitrate. Phosphate additive utilizes nitroammophosphate at weight ratio N:P₂O₅ equal to 23:21 or 26:13 and phosphate additive melt is preliminarily completely or partly separated from infusible solid phase, after which phosphate additive is introduced in amount 2-6% (as P₂O₅) of the weight of final product. Granulated mineral fertilizer contains ammonium nitrate and monoammonium phosphate with total content of digestible P₂O₅ within a range of 2÷6%, in which case 0.4÷28.6% of P₂O₅ is present in the form of dicalcium phosphate.

EFFECT: reduced corrosiveness of process medium, increased nutritive value of fertilizer having physicochemical properties competitive with those of known fertilizers, and simplified manufacturing technology.

5 cl, 1 tbl, 5 ex