Preparation and thermal decomposition of synthetic bayerite

The formation process of bayerite, from an aqueous solution of sodium alumi nate through enforced decomposition of aluminate ions by introducing CO2 ga s and aging with mechanical stirring, was investigated by pH measurements o f the mother solution during preparation reaction and characterization of p recipitates obtained at various stages of preparation. An amorphous precipi tate, produced initially by the reaction of introduced CO2, transformed to bayerite via pseudoboehmite during aging. It was found that the crystalline particle size and morphology of the crystallized bayerite change depending systematically on the preparation conditions. The reaction pathway of the thermal decomposition of the synthesized bayerite was investigated by using thermoanalytical techniques.