ИССЛЕДОВАНИЕ ПРОЦЕССА АММОНИЗАЦИИ НЕОЧИЩЕННОЙ ЭКСТРАКЦИОННОЙ ФОСФОРНОЙ КИСЛОТЫ ПРИ ПОЛУЧЕНИИ АЗОТНО-ФОСФОРНО-МАГНИЕВЫХ УДОБРЕНИЙ

Abstract

This article considers the technological feasibility of 
producing a complex nitrogen-phosphorus-magnesium fertilizer based on 
unpurified wet-process phosphoric acid (WPA) using the ammoniation method. 
The main chemical transformations during the interaction of phosphoric acid 
with ammonia, the effect of the neutralization degree and pH on the phosphate 
system composition, as well as the role of magnesium in forming the final 
product are analyzed. It is demonstrated that impurities in wet-process 
phosphoric acid, including magnesium, iron, aluminum, and calcium 
compounds, as well as fluorine-containing components, can significantly affect 
solubility, viscosity, and the formation of insoluble phases. Based on literature 
data, a research methodology is proposed, including WPA preparation, 
ammoniation, pH adjustment, introduction of a magnesium-containing 
component, phase separation, product drying, and analytical control of the N, 
P2O5, and Mg contents. This work can serve as a basis for laboratory research 
and subsequent optimization of the operating parameters.