PHOSPHOR-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILISER AND METHOD OF PRODUCING GRANULATED PHOSPHOR-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILISER

摘要

The invention relates to a complex nitrogen-phosphate-potassium fertiliser (NPK), wherein mass fraction of total nitrogen is from 13-15%, mass fraction of total phosphates in terms of P₂O₅ is from 9-10%, mass fraction of potassium in terms of K₂O is from 13-15%, and also to a method of production thereof from a solid phosphate salt, which is a mixture of fluorapatite Ca₅(PO₄)₃F and dicalcium phosphate CaHPO₄×nH₂O, where n is from 0 to 2, and the content of fluorapatite Ca₅(PO₄)₃F is from 27 to 99%, using different potassium and ammonium salts as a source of nutrients in the fertiliser. The technical result consists in providing improved properties of the NPK-fertiliser, in particular, the method of production thereof allows to increase the strength of granules, solve the problem associated with the plasticity of granular complex fertilisers, increase water solubility of phosphorus contained in the fertiliser by 98% and thus improve the consumer properties of NPK-fertilisers.