Purpose Aluminum sulfate is mainly used as a sizing agent for papermaking and as a flocculant for drinking water, industrial water and wastewater treatment. It is also a raw material for the production of artificial gems and other aluminum salts, such as ammonia alum, potassium alum, and refined aluminum sulfate. In addition, aluminum sulfate is also widely used in high-quality clarifiers, petroleum deodorizing and decolorizing agents, concrete waterproofing agents, high-grade paper forging white, titanium dioxide post-film treatment and the production of catalyst carriers.