Water Treatment

Aluminium sulphate is also utilized for the treatment of potable water as well as process water, sewage, and other industrial effluents. It promotes efficient sludge digestion and dewatering. This is due to its flocculation property, it coagulates all impurities into large particles, and lets them settle at the bottom, and hence the impurities can be filtered out of the water.It is also used to maintain the stability of the lake or reservoir. Excess Phosphorus in the lake water induces ‘booming algae’, Alum can reduce the phosphorus concentrations and maintain the phosphorus normal concentration.

Gardening

Aluminium sulphate is used in horticulture, where it is added to the soil to reduce its pH, as it hydrolyses to form aluminium hydroxide and a dilute sulphuric acid solution. This often causes the flowers to change to bright colours.

OTHER APPLICATION

Aluminium sulphate is used in the paper making industry as a paper sizing agent.In textile industry as as a mordant in dyeing and printing.It is also used as a waterproofing agent and accelerator in concrete.In the construction industry, it is used as a foaming agent in fire extinguishers.

PRODUCT IDENTIFICATION

CAS NO : 10043-01-3
EINECS NO : 233-135-0
FORMULA : Al2(SO4)3
MOL WT. : 342.14

SYNONYMS Alum; Aluminium sulphate; Aluminium Alum; Aluminium sulfate, anhydrous; Aluminium trisulfate Anhydrous; Cake Alum; Dialuminum sulfate; Sulphuric acid

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE : white to off-white lump or powder
MELTING POINT : 770 C (Decomposes)
SPECIFIC GRAVITY : 2.7
SOLUBILITY IN WATER :Soluble
pH : >2.9 (5% solution)
NFPA RATINGS
Health : 1 Flammability: 0; Reactivity: 0
FLASH POINT ; Not considered to be a fire hazard
STABILITY : Stable under ordinary conditions

SALES SPECIFICATION - FERRIC

APPEARANCE : White to off-white lump or powder
ALUMINIUM (as Al2O3) : 17.0 ~ 18.0%
IRON COMPOUND : 0.5% max
INSOLUBLES IN WATER : 0.3% max
pH : 2.7 ~ 3.7 (5% Sol.)
HEAVY METAL (as Pb) : 10ppm max
ARSENIC (as As) : 3ppm max