For procurement professionals in the chemical industry, sourcing the correct grade of Polyaluminium Chloride (PAC) is critical for achieving desired water treatment outcomes efficiently and cost-effectively. With various manufacturers offering different specifications, understanding these parameters is key to making informed purchasing decisions. This guide focuses on the essential specifications to consider when you buy Polyaluminium Chloride.

Polyaluminium Chloride (CAS 1327-41-9) is primarily characterized by its Aluminum Oxide (Al2O3) content and basicity. The Al2O3 content, often expressed as a percentage, indicates the active aluminum content, which is directly related to the coagulant's effectiveness. Higher Al2O3 percentages generally translate to greater coagulating power. For industrial wastewater treatment, grades with Al2O3 content typically ranging from 28% to 31% are common. For applications requiring higher purity, such as drinking water treatment, specific grades with controlled impurity levels are essential.

Basicity is another critical specification, referring to the degree of hydrolysis of the aluminum species. It is typically expressed as a percentage and indicates the ratio of hydroxyl groups to aluminum atoms. A higher basicity means more polymerized aluminum species are present, which generally leads to more effective charge neutralization and flocculation, especially in challenging water conditions. Different applications may benefit from varying basicity levels; for instance, higher basicity PAC can be more effective in treating water with high organic content or turbidity.

The water-insoluble matter is also an important parameter. A low percentage of insoluble solids is desirable, as it ensures better solubility and reduces the risk of clogging dosing equipment. For solid PAC products, the drying method, such as spray drying, is also a quality indicator, influencing particle size distribution and dissolution rates. Similarly, for liquid PAC, concentration and clarity are key indicators of quality.

When sourcing PAC, especially from international suppliers like those in China, it's vital to verify product certifications such as ISO, SGS, or WQA, which attest to quality control and product compliance. Prospective buyers should also consider the supplier's ability to provide technical data sheets, sample testing, and consistent supply. Understanding these specifications allows procurement professionals to effectively compare offerings and secure the most suitable Polyaluminium Chloride for their specific industrial water treatment needs. Engaging with a reputable manufacturer ensures you receive the PAC that meets your precise requirements, leading to optimized water clarification and cost savings.