THERMAL-DECOMPOSITION OF SODIUM ALUMINUM SULFATE CRYSTALLOHYDRATE

Dynamic TG investigations were carried out to elucidate the mechanisur of thermal decomposition of aluminium sodium sulphate crystallohydrat e. Shimadzu 31H and MOM Derivatograph X-ray diffraction and other tech niques were used to determine data on the decomposition, activation en ergy, structure and phases in the solid products. Isothermal study in the temperature ranges 883-958 K and 983-1113 K in air or a reducing g as atmosphere revealed different reaction mechanisms. Depending on the experimental conditions, mainly Al2O3 can be obtained.