Ammonium alum((NH4)Al(SO4)2·12H2O.) is an extremely useful and profitable mineral salt. It is used as laboratory reagent, water purification, in vegetable glues, in porcelain cements, in deodorants and in tanning, dyeing and in fireproofing textiles.
The first step of the manufacturing process is as follows,
Ammonia + Sulfuric Acid --> Ammonium Sulfate
Aluminium trihydroxide + Sulfuric Acid -->Aluminum Sulfate
In the second step, the products Ammonium Sulfate and Aluminum Sulfate are combined using hydrometallurgy process,
Ammonium Sulfate + Aluminum Sulfate --> Ammonium Aluminum Sulfate (Ammonium Alum)