In the realm of polyaluminium chloride, it is widely recognised that white products represent superior quality with higher concentrations. As awareness of its benefits grows, its applications continue to expand. As is well known, white products meet food-grade standards. In recent years, however, it has surpassed aluminium sulphate to emerge as a dark horse within the papermaking industry!
Compared to aluminium sulphate,
white polyaluminium chloride offers distinct advantages. It contains fewer impurities and, upon dissolution, forms a white, near-transparent solution that closely matches the colour of paper. Furthermore, polyaluminium chloride primarily consists of aluminium oxide molecules. During hydrolysis reactions, aluminium ions exhibit low reactivity levels. Consequently, the reduction in pulp pH is significantly less pronounced than with aluminium sulphate. It also overcomes the drawback of aluminium sulphate, which struggles to form a cohesive paste when cheap calcium carbonate fillers are added. For these reasons, the white product holds a distinct advantage.
White polyaluminium chloride is gaining increasing popularity in papermaking. It is produced by reacting high-purity aluminium hydroxide with hydrochloric acid, followed by plate-and-frame filtration, decolourisation, and spray drying. However, few domestic manufacturers genuinely possess the capability to produce white products. The market is a mixed bag, with considerable confusion regarding both quality and pricing. Therefore, selecting a product of superior quality is paramount. White polyaluminium chloride demands specific production standards and quality control, including content, colour intensity, and other parameters. Its content must exceed 30%. Pricing is generally determined by factors such as raw materials, production processes, costs, and profit margins, making it relatively transparent. White products typically command prices exceeding three thousand yuan. Should you encounter exceptionally low-priced white products, quality should be scrutinised. After all, one gets what one pays for; excessively cheap items may compromise on raw materials and manufacturing processes.
Polyaluminium chloride is inherently a water-soluble inorganic polymeric product, available in yellow, brown, or white variants, with white products generally representing superior quality. Due to its structural morphology, polyaluminium exhibits rapid flocculation and sedimentation rates. It demonstrates low corrosivity to pipelines and delivers pronounced water purification effects. Suitable for a broad pH range in water treatment, it effectively removes impurities including suspended solids (SS), chemical oxygen demand (COD), biological oxygen demand (BOD), and heavy metal ions. It finds extensive application in domestic water supply, potable water treatment, and industrial wastewater management.
