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ALUMINIUM SULPHATE CHARACTERISTICS AND SPECIFICATION

Form

Hydrated form, AI2(SO4)3 18H2O is commonly known as Alum Ferric Alum is known as ferric Aluminum Sulphate. It is the alum with Iron content.

Chemical formula

Theoretically, Alum is AI2(SO4)3 18H2O but usual commercial form is , closer to AI2(SO4)3 14H2O

Appearance

White Crystalline solid, with a sweet taste.

CATEGORIES AND GRADES

There are two broad categories of alum as follows:
  • Ferric Alum which is generally made from Bauxite and Iron free Alum (non Ferric Alum), generally made from Alumina.
  • Commercially, Hydrated Aluminum Sulphate is called Alum and is sold under such names as Filler Alum, Commercial Alum, and Paper Maker's Alum etc.

SPECIFICATION OF ALUMINIUM SULPHATE (NON-FERRIC)

ALUMINIUM SULPHATE
(NON FERRIC ALUM)

  • • Physical Appearance : Lumps:- Size : 10mm to 50 mm (Un-even shape)
  • • Alumina Content as Al203: 17% min
  • • PH @ 5% SOI n 2.8 min
  • • Insoluble matter in water :-0.3 max
  • • IRON AS Fe : 100PPM

ALUMINIUM SULPHATE
(NON FERRIC ALUM)

  • • Alumina Content as AL203:- 17% Min
  • • Physical Appearance :-(Crystline Powder)
  • • 2mm Max. Grain Size
    • 3mm Max. Grain Size
    • 4mm Max. Grain Size
  • • PH @ 5% SOI :2.8 Min
  • • Insoluble matter in water :-0.3 max
  • • IRON AS Fe : 100PPM

AMMONIA ALUM
(NON FERRIC, ALUMINIUM AMMONIUM SULPHATE)

  • • Appearance (Colour) :
    White
  • • Solubillity (Turbidity) 10% aq. solution :
    Clear
  • • Solubillity (Colour) 10% aq. solution :
    Colourless
  • • Iron (Fe) :
    max.0.0005%
  • • Appearance (Form) :
    Crystalline powder
  • • Assay :
    min. 99.5%
  • • pH (5% aq. Solution) :
    ~ 3.0
  • • Chloride (Cl) :
    max.0.001%

POLY ALUMINIUM CHLORIDE POWDER

  • • Appearance :
    Light Yellow powder
  • • Chloride as CI :
    33%
  • • Sulphate as SO4 :
    10%
  • • Iron (Fe) :
    max.0.0005%
  • • Alumina Content as Al203 :
    29%
  • • PH @ 5% sol :
    2.5 - 4.5
  • • Insoluble :
    1%
Application SectorNature of Application
Water TreatmentThe major area of use for Alum is in Water treatment and clarification. Its clarifying action is attributed to Aluminum Hydroxide formation by hydrolysis. This, in turn, carries down all the colloidal impurities and forms a slimy layer at the bottom
Sizing of PaperThe other major area of use is in sizing of paper. It reacts with sodium resonate to give insoluble Aluminum resonate. For sizing of paper, Alum should be free from Ferric ions or else the paper will be discolored. Ferrous ions do not farm since they form a soluble colorless resonate which, however, would represent a loss of resonate. Alum imparts certain degree of resistance to penetration by liquids during sizing of paper.
Miscellaneous ApplicationAlum is also required in various other industries like Dyes, Food, Petroleum, Pharmaceuticals, Fire-proofing, tanning etc

DAC ALUM FEATURES:

  • Wide utility
  • Best Quality
  • Longer self life
  • Durable Standard
  • Non-toxic
  • Free from impurities
  • Accurate Composition
  • Highly effective
  • made from virgin material