Investigation of the properties of alumophosphate solutions and products crystallized from them
https://doi.org/10.29235/1561-8331-2024-60-2-121-128
Abstract
The physicochemical properties of freshly prepared alumophosphate solutions obtained in the Al(OH)3 – H3PO4 – H2O system with the molar ratio n(Al2O3) : n(P2O5) = 1.0 : 2.75 have been investigated. The density and temperature dependence of the dynamic viscosity of the studied solutions with a concentration of P2O5 300–485 g/l were studied. The values of the apparent activation energy of the viscous flow (Eη) of alumophosphate solutions are calculated and the concentration range (390–420 g/l P2O5) is established, in which Eη is practically constant and is 15.0 kJ/mol. It is suggested that the change in the activation energy of the viscous flow of alumophosphate solutions is due to their structure determined by the composition of aluminum phosphate complexes. The influence of the viscosity properties of alumophosphate solutions and their concentration on the crystallization process of hydrated alumophosphate, in particular, the duration of the induction period and the rate of phase formation, is shown.
About the Authors
L. S. Eshchenko
Belarusian State Technological University
Belarus
Belarus
Eshchenko Lyudmila S. – D. Sc. (Engineering), Professor, Professor of the Department
13a, Sverdlov Str., 220006, Minsk
А. V. Paniatouski
Belarusian State Technological University
Belarus
Belarus
Paniatouski Aleh V. – M. Sc., Postgraduate Student
13a, Sverdlov Str., 220006, Minsk
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