Polyaluminium Chloride[6]
Overview
Polyaluminium Chloride (PAC) with 20-28% Al2O3 content is an inorganic polymer coagulant renowned for its stability and high charge density. It bridges traditional aluminum salts and advanced nano-coagulants, offering superior turbidity removal and flocculation performance. PAC is synthesized through controlled hydrolysis of aluminum chloride, resulting in a polymerized structure with varying hydroxyl groups. Its 20-28% grade strikes a balance between cost and efficacy, making it a staple in municipal and industrial water treatment sectors.
Physical and Chemical Properties
This PAC variant appears as yellow crystalline solids or powder, with rapid dissolution in water. Its polymerization degree ranges between 70-85%, ensuring optimal molecular chain length for colloidal destabilization. Key metrics include a basidity of 40-90% and pH (1% solution) of 3.5-5.0. Unlike alum, it exhibits lower corrosivity and maintains effectiveness across wider temperature (4-40°C) and pH ranges (5-9), reducing alkali dosing needs.
Main Applications
In drinking water plants, PAC removes suspended solids, arsenic, and fluoride while meeting WHO residual aluminum standards (<0.2 mg/L). Its low heavy metal content suits food industry water purification. Industrial applications include textile wastewater decolorization, where it outperforms conventional coagulants by 30-50% in COD reduction. Other uses encompass oil-water separation, paper sizing, and catalyst carrier production.
Safety and Storage
Though non-flammable, PAC may emit hydrogen chloride vapor when heated. Workers should avoid inhalation and skin contact—ventilation and PPE are mandatory during bulk handling. Storage requires moisture-proof packaging (usually 25kg PE-lined bags) stacked ≤2m high. Shelf life exceeds 12 months when stored below 30°C. Incompatible materials include strong oxidizers and alkaline substances.
B2B Procurement Guide
Prioritize suppliers providing batch-wise quality certificates with Al2O3 (≥28%), basidity (70-75%), and insoluble matter (≤1.5%) specifications. Bulk shipments (20MT containers) typically offer 5-10% cost savings over bagged orders. For wastewater treatment, opt for higher basidity grades (≥80%) to reduce sludge volume. Verify regulatory compliance (e.g., NSF/ANSI 60 for drinking water applications) and request pilot-scale testing reports before large-volume purchases.
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