Polymeric Aluminum Chloride Color Types

Polymeric Aluminum Chloride Color Types
Polymeric aluminum chloride typically comes in white, yellow, or brown shades. Shades have significant implications for use and production technology. Aluminum oxide content of 27%-30% within national standards often results in earthy yellow, yellowish, or pale yellow solid powder. These types are highly water-soluble, undergoing electrochemical, coagulation, adsorption, and precipitation during dissolution. They form fast, large, active floccules, precipitate rapidly, and effectively purify high turbidity water.
White polymeric aluminum chloride, also known as high-purity iron-free white polymeric aluminum chloride or food-grade white polymeric aluminum chloride, is the highest quality product compared to other polyaluminum chlorides. It's primarily made from high-quality aluminum hydroxide powder and hydrochloric acid using the state-of-the-art spray drying method. It's used in paper sizing agents, sugar decolorizing clarifiers, tanning, medicine, cosmetics, precision casting, and water treatment.
Yellow polymeric aluminum chloride is made from aluminum calcium carbonate powder, hydrochloric acid, bauxite, and is mainly used in wastewater and drinking water treatment. For drinking water treatment, it's made from aluminum hydroxide powder, hydrochloric acid, and a small amount of aluminum calcium carbonate powder using the plate and frame filter process or spray drying process. For drinking water treatment, the country has strict requirements on heavy metals, so both raw materials and production processes are superior to brown polymeric aluminum chloride. Yellow polymeric aluminum chloride is typically produced by drum drying or spray tower drying, available in flake or powder forms.
Brown polymeric aluminum chloride is made from aluminum calcium carbonate powder, hydrochloric acid, bauxite, and iron powder. The production process uses drum drying, primarily for wastewater treatment. The color is brown due to the addition of iron powder, with darker colors corresponding to higher iron powder content. Iron powder exceeding a certain amount is sometimes referred to as polymeric aluminum chloride iron, demonstrating excellent performance in wastewater treatment.