Aluminium Sulphate

Aluminium sulphate Al2(SO4)3• 18 H2O (technically usually 14–15 H2O) is next to oxide the most commonly used aluminium compound. It is technically produced by the reaction of pure aluminium hydroxide with concentrated sulphuric acid.
2 Al(OH)3+ 3 H2SO4--> Al2(SO4)3+ 6 H2O
In anhydrous condition aluminium sulphate is a white powder. Hydrated, it forms colourless, acicular, sour-tasting crystals. Aluminium sulphate dissociates in water to form a colloidal solution of aluminium hydroxide molecules and positively charged aluminium hydroxide ions (Al (OH)2+, Al (OH)2+):
Al2(SO4)3+ 6 H2O --> 2 Al(OH)3+ 3 SO42-+ 6 H+
Through this process, such aqueous solutions are reacting strongly acidic. The hydroxide formation comes – after the achievement of equilibrium – to a halt, so that the solution also contains some free Al3+ions. The cationic activity of aluminium sulphate solutions is dissolved by the positively charged aluminium hydroxide ions, which are aggregated with the aluminium hydroxide molecules. Therefore you have a positive zeta potential.
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Parameters
Specification
01.
Physical Appearance
Lumps : 1-4 “
Powder : 60 – 120 mesh
02.
Alumina Content as Al203
17 + 0.5%
03.
Iron as Fe
100 ppm max
04.
pH of 5% solution
2 to 3%
05.
Insoluble matter
0.3% MaxCompany Information
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