THERMOCHEMICAL CALCULATIONS OF EQUIULIBRIUM RELATIONS OF ALUMINIUM HYDROXIDE PHASES

Abstract

A search and analysis of thermodynamic data on the phases formed during the precipitation of aluminium hydroxide from acidic salts’ solutions was carried out in order to further study the equilibrium relations of aluminium hydroxide. The study of literature on the thermodynamic properties of various aluminium hydroxides modifications obtained by low-temperature calorimetry revealed a contradiction in the calorimetric data on boehmite, which is explained by the difference in thermochemical properties between the phases of crystalline and gelatinous boehmite (boehmite and pseudoboehmite). Saturation indices of aluminium hydroxide phases were plotted, which, in turn, made it possible to compare these phases in terms of their stability and confirm certain regularities characterizing the precipitation conditions