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Polyaluminum chloride (PAC) is an inorganic compound—a cutting-edge water purification material and an inorganic polymeric coagulant, commonly referred to as "polyalum." It represents a water-soluble inorganic polymer complex that exists between AlCl₃ and Al(OH)₃, with the general chemical formula [Al₂(OH)ₙCl₆₋ₙ]ₘ, where *m* denotes the degree of polymerization, and *n* reflects the charge neutrality level of the PAC product. When *n* ranges from 1 to 5, the resulting structure adopts a Keggin configuration, forming highly charged polymeric chain complexes that exhibit exceptional electrostatic neutralization and bridging capabilities for colloids and particulate matter in water. This unique property enables PAC to effectively remove even trace toxic substances and heavy metal ions while maintaining remarkable stability. PAC can be tested according to the international standard GB 15892–2003. Thanks to the bridging action of hydroxyl ions and the polymerization effect of multivalent anions, the resulting polyaluminum chloride is an inorganic polymeric water treatment agent characterized by a relatively high molecular weight and strong positive charge—making it highly effective for water treatment applications.
Polyaluminum chloride exhibits properties such as adsorption, coagulation, and sedimentation, but it is unstable and mildly corrosive. If accidentally splashed onto the skin, rinse immediately with plenty of water. Production personnel must wear protective work attire, including masks, gloves, and long rubber boots. Polyaluminum chloride boasts excellent spray-drying stability, a wide compatibility across different water types, rapid hydrolysis, strong adsorption capacity, the ability to form large, dense flocs that settle quickly, resulting in low turbidity in treated water, and outstanding dewatering performance. Using the spray-dried product significantly reduces water-related risks, making it a safer choice for ensuring residents' drinking water quality. For this reason, polyaluminum chloride is commonly referred to simply as PAC or "spray-dried polyaluminum chloride." It is suitable for treating raw water of varying turbidity levels and maintains a broad pH tolerance range. However, compared to polyacrylamide, its flocculation efficiency is considerably lower.
The basicity of polyaluminum chloride is a relatively important indicator for polyaluminum products, especially those intended for drinking water applications. The lower the basicity, the higher the price—allowing buyers to adjust their purchasing strategies based on the manufacturer’s specific circumstances. Additionally, the basicity varies depending on the raw materials used and the production processes employed, requiring manufacturers to fine-tune their formulations accordingly. Increasing the basicity of polyaluminum chloride products can significantly enhance both production and operational efficiency. For instance, boosting the basicity from 65% to 92% can reduce raw material costs by up to 20% and lower usage costs by as much as 40%.
PAC 26% Content Wastewater Treatment Quick-Setting Agent – Chemicals in Stock, Essential Material for Coal Washing and Underground Mine Water Management
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