What is polyaluminium chloride?

Polyaluminium Chloride (PAC) is an inorganic polymer coagulant. It is a yellow solid powder that is widely used in water treatments. PAC is better than other aluminum salts such as aluminium chloride, aluminium sulphate, and other various forms of Polyaluminium chlorisulfate and Polyaluminium chloride that they have lower charge than PAC.

How long does polyaluminium chloride take to precipitate?

Stable PAC needs at least 9 weeks at 30o to precipitate. The presence of water during the process will be evaporated in the reactor that produces steam. Finally, Polyalumunium chloride contains more than 50% Al2O3. Polyaluminium chloride is used in the treatment of drinking portable water and wastewater treatment.

What happens when aluminium hydroxide is mixed with hydrochloric acid?

It is an explosive and hazardous substance. The industry usually adds the aluminium hydroxide in the second process. The combination of aluminium hydroxide and hydrochloric acid produces aluminium chlorohydrate (ACH). This reaction determines the value of m and n in the Polyalumunium chloride molecules. This reaction happens at 500 kPa and 170oC.