METHOD TO PRODUCE GRANULES OF COMPOSITE FERTILIZERS Russian patent published in 2004 - IPC

FIELD: chemical industry and agriculture. SUBSTANCE: the invention is dealt with chemical industry and agriculture and presents a method to produce the composite fertilizers granules containing at least two ingredients from a set of nutrients for plants, that are chosen from a group including nitrogen, phosphorus and potassium. The offered method provides for preparation of a supplied solid material containing, at least, a such solid raw material for fertilizers as carbamide. The delivered material or its part is fed in a melting device for melting there and the portion for melting of the indicated material makes from 10 up to 40 mass %. Then it is aged in a molten state. A part of the molten material is entered in a granulator to produce a granulated product and cool it for production of granules of the dry composite fertilizer having desirable range of granulars sizes. At that the terms are kept, at which. Thus conditions at which water or a liquid containing water is not introduced in the process. The invention allows to produce the granular product with high physical properties at decrease of expenditures for additional equipment. EFFECT: the method ensures production of granular products with high physical properties and decrease of expenditures for additional equipment. 20 cl, 5 tbl