Alum/ Aluminium Sulphate

Alum/Aluminium Sulphate
Aluminium Sulphate is used for purification of water. In Industries it
plays a role of coagulant in waste water Treatment Plant to coagulate
solid matters and allowed to settle at the bottom. In Paper Industries
it is used for sizing of paper and pH control to precipitate rosin on
to the paper fibers. Alum in excess is required in pulp solution to
ensure sufficient sizing. It is used as mordant in textile industries
for the fiber by combining with the dye pigment to dorm an insoluble
compound. Alum is used as astringent to prevent bleeding from small
shaving cut. A styptic pencil is a short stick of medication usually of
aluminium sulphate anhydrous which is used for stanching blood by
causing blood Vessels to contact at the sprite of wound. It has a
cosmetic use as a deodarant. Physical
Properties












Physical
Properties






  Appearance


  White Powder




  Odor 


  Odorless




  Molecular Weight


  594.35




  Formula


  Al2(SO4)3. 
14H2O



Chemical
specification





  Alumina  Al2O3


  min 17 %




  Iron Fe2O3 


  max 0.01 %




  Insoluble 


  0.02 %




  Arsenic as As


  0.003 %




  pH of 5 % So1n


  2.5 - 3