Poly Aluminium Chloride (PAC) is a salt commonly used in water purification and as a coagulant. Compared to other aluminum salts, it’s best suited for removing and destabilizing suspended materials- thanks to its high charge.

It is used in water purification, ensuring water is safe for drinking. Like all other coagulants, it works by extracting all the dissolved matter in water by clumping them together and then suspending them. The resultant matter is then filtered and disposed of.

How PAC Is Made

Poly Aluminum Chloride consists of the following components.

100-121 parts of bauxite.

160-190 parts of hydrochloric acid (20-30%).

70-90 parts of calcium aluminate.

30-40 parts of calcium carbonate.

The production processes commence with.

Heating the bauxite for 30 min – 2 hrs. (temp 1200-1500 °C).

Crush the bauxite.

Combine the bauxite and calcium aluminate in a reaction kettle.

Add 25-30% hydrochloric acid into the kettle.

Heat the mixture (95-110°C) for 1-3 hrs.

Leave the mixture for 15-24 hrs for the reaction to take place, forming Polyaluminium Chloride.

At 105°C, the resultant solution should be dehydrated to retrieve a sample for analysis.

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