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AssigneeUnie van Kunstmestfabrieken B.V.
InventorsJohan W. Hoogendonk, Servatius J. Lucassen
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Storage-stable nitrogen-phosphorous-potassium fertilizer granules and prills are made by adding to a molten or aqueous solution mixture of ammonium nitrate and ammonium phosphate, a particulate potassium salt, typically potassium chloride, in which the particles have an average size no greater than 55 microns and less than 1% by weight of the particles are larger than 150 microns. The potassium salt is added without the need for preheating and at a temperature of between 5.degree. and 40.degree. C. to the mixture where it is simultaneously converted. The resulting mixture is granulated or prilled into NPK fertilizer particles.
In a process for the preparation of granules of NPK fertilizer comprising adding a solid potassium salt to a liquid melt or aqueous solution containing ammonium nitrate and ammonium phosphate and granulating the resulting mixture, the improvement comprising adding said potassium salt to said liquid melt or aqueous solution in the form of particles having a temperature in the range of between 5.degree. C. and 40.degree. C. and an average particle size of at most 55 microns with at most 1 percent by weight of particles over 150 microns, whereupon said resulting mixture is granulated, thereby forming storage-stable granules of NPK fertilizer.
In a process for the preparation of granules of NPK fertilizer comprising adding solid potassium salt to a liquid melt or aqueous solution containing ammonium nitrate and thereafter adding ammonium phosphate, and granulating the resulting mixture, the improvement comprising adding said potassium salt to said liquid melt or aqueous solution in the form of particles having a temperature in the range of between 5.degree. C. and 40.degree. C. and an average particle size of at most 55 microns with at most 1 percent by weight of particles over 150 microns, whereupon said resulting mixture is granulated, thereby forming storage-stable granules of NPK fertilizer.
Dependencies are inferred from the claim text.