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 H3PO4-H2O system was found in the range of acid concentrations of 20-30% and 37-45% P2O5. At an acid concentration of 20, 35% and 45% P2O5 there is a minimum electrical conductivity, while at a concentration of 30 and 40% P2O5, 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 H3PO4-H2O system decreases with the introduction of magnesium sulfate and ammonium nitrate. The regularity of the thickening of magnesium-containing acid is substantiated.
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