Aluminum
sulfate (chemical formula Al2(SO4)3, formula weight
342.15), white orthorhombic crystalline powder, density
1.69g/cm³
(25℃). In the paper industry, it is used as a
precipitant for rosin gum, wax emulsion and other
rubber materials, as a flocculant
in water treatment, and as an internal retention agent
for foam fire extinguishers, raw materials for the
production of alum and
aluminum white, petroleum decolorization, deodorant,
and some Raw materials for medicines, etc. It can also
produce artificial
gems and high-grade ammonium alum.