Aluminium sulphate

Aluminium sulphate
CAS No.10043-01-3

Aluminum sulfate is an odorless, white, or off-white crystalline solid or powder. The compound is made by adding aluminum hydroxide to sulfuric acid. It's hygroscopic, which means it has the ability to absorb and hold water molecules from the surrounding atmosphere. It's also water soluble and not volatile or flammable. Aluminum sulfate is extremely acidic. When combined in solution with water its pH can be less than two, which can make it capable of burning human skin and corroding metal.

Chemical Properties

Applications

Aluminium sulphate is used primarily as an electrolyte in colloidal systems as coagulant and fixative, as fabrication agent in tanneries (“alum tannage”, “white tannage”) and as pickling agent in the textile industry.
The primary applications are:

· Drinking water treatment

· Industrial and municipal wastewater treatment

· Pulp & Paper industry

· Sugar industry

· Leather industry

· Textile industry

· Building chemistry

As a typical application of aluminium sulphate as a fixative in the paper industry, the widely used resin sizing is also relevant to mention. The resin glue particles are fixed on the fibre surface by the dissociated aluminium sulphate and parallel to this the in the solution contained Al³⁺ ions react with resinate ions to form aluminium resinate.

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