Aluminum sulfate without iron is white crystal, specific gravity is 1.69, it is easy to absorb moisture and agglomerate when stored in air for a long time, the dehydration temperature is 86.5℃, it can be dissolved in water, acid and alkali, the aqueous solution is acidic with sour and astringent taste. When heated to 530℃, it starts to decompose, and the decomposition ends at 860℃, and the final product of decomposition is r-AL2O3. During the hydrolysis process of iron-free aluminum sulfate, it first generates the intermediate product of alkali salt, and then generates aluminum hydroxide.
