PHOSPHORUS-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILIZER AND METHOD FOR THE PREPARATION OF GRANULATED PHOSPHORUS-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILIZER

摘要

The invention relates to a complex nitrogen-phosphorus-potassium NPK-fertilizer, where mass fraction of total nitrogen is from 13-15%, mass fraction of total phosphates, in terms of P₂O₅, is from 11-15%, mass fraction of potassium, in terms of K₂O, is from 7-8%, and also to a method for the preparation of said fertilizer from a solid phosphate salt, being a mixture of fluorapatite Ca₅(PO₄)₃F and dicalcium phosphate CaHPO₄×nH₂O, where n is 0 to 2, with fluorapatite Ca₅(PO₄)₃F content from 27 to 99%, using various potassium salts, in particular potassium chloride, and ammonium salts as sources of nutrients in the fertilizer. The technical result is providing enhanced properties of NPK-fertilizer, in particular a method for its preparation allows to improve the strength of granules, to solve the problem related to the plasticity of granulated complex fertilizers, to improve water solubility of phosphorus contained in the fertilizer by 98%, thereby improving consumer properties of NPK-fertilizer.