PRODUCTION OF NPK OR NP MATERIAL CONTAINING POLYPHOSPHATES

摘要

It is disclosed a method for the nitrosphate process to produce NPK or NP material with polyphosphates by reducing the pressure in the evaporation stage and / or increasing the temperature in the evaporation stage and/or controlling the temperature in the crystallization stage wherein a material is produced containing a mixture of MAP, DAP, DCP and optionally apatite and a controlled amount of condensed phosphates (polyphosphates), and N/P and Ca/P ratios of the NPK material are N/P = 0.95 and 1.0 = Ca/P = 0.2 and products thereof.