Study of Physico-Chemical Properties of Phosphorate Solutions
I. T. Shamshidinov, Asadjon Kambarov, Rikhsitilla Najmiddinov, Ilyos Rustamov, Ilkham Usmanov, Murodjon Samadiy
Abstract
The results of studies of the physicochemical properties of extraction phosphoric acids containing magnesium in the presence of ammonium nitrate are presented. A decrease in the heat of vaporization in the H 3 PO 4 -H 2 O system was found in the range of acid concentrations of 20-30% and 37-45% P 2 O 5 . At an acid concentration of 20, 35% and 45% P 2 O 5 there is a minimum electrical conductivity, while at a concentration of 30 and 40% P 2 O 5 , the electrical conductivity of solutions reaches a maximum value at temperatures of 25-45%, which is explained by structural changes occurring in the acid during dissociation and dimerization, depending on the concentration. The electrical conductivity of the H 3 PO 4 -H 2 O system decreases with the introduction of magnesium sulfate and ammonium nitrate. The regularity of the thickening of magnesium-containing acid is substantiated.