What are the colors of polyaluminum chloride？
Release time: 2025-12-15
The color of polyaluminum chloride is generally white, yellow, brown, and different colors have differences in production technology and use.
1. Color Classification and Level Correspondence
The color of polyaluminum chloride (PAC) is primarily determined by its raw material composition, production process, and impurity content, and is classified into three core grades:
technical grade
Solid color: brown, dark brown or reddish brown.
The raw materials include calcium aluminate powder, bauxite and iron powder. The higher the amount of iron added, the darker the color. When the amount of iron is excessive, it is called "polyaluminum ferric chloride".
Liquid color: dark yellowish brown to blackish brown.
Characteristics: The solution exhibits high turbidity due to its high content of heavy metal impurities and water-insoluble substances (approximately 2%).
Application: Industrial wastewater treatment (e.g., dyeing, metallurgy, coal washing wastewater), suitable for high-turbidity sewage.
drinkable level
Solid color: light yellow, golden yellow or pale yellow.
The raw material is aluminum hydroxide powder and a small amount of calcium aluminate powder. The impurity is less after the plate and frame filter or spray drying process.
Liquid color: Light yellow transparent solution.
Properties: Water insoluble matter ≤0.3%, heavy metal content meets the national drinking water standard.
Application: It is used in water purification plants and domestic water treatment, and has remarkable effects in low-temperature and low-turbidity environments.
food grade
Solid color: pure white or milky white powder.
The preparation of the powder was by spray drying of high purity aluminum hydroxide powder and food grade hydrochloric acid.
Liquid color: colorless and transparent solution.
Properties: Water-insoluble matter ≤0.1%, Al2O3 content ≥30%, solution colorless.
Application: medicine, cosmetics, food processing (sugar decolorization), precision casting.
2.The Core Influencing Factors of Color Difference
Raw materials and impurities
Iron: Industrial-grade iron powder is added to enhance flocculation, resulting in a darker color; food-grade iron is strictly removed.
Heavy metal control: limits of lead, chromium and other heavy metals in drinking water and food, and lighter color.
production engineering
Roller drying: commonly used in industrial applications, characterized by high water insolubility and dark coloration.
Spray drying: Specifically designed for drinking water and food-grade applications, delivering superior purity and solubility.
Plate and frame filter: remove impurities and improve the transparency of the liquid.
Content of active ingredients
The lighter the color, the higher the alumina content (industrial grade: 24-26% → food grade: ≥30%).
The difference of basicity: the basicity of food grade is 50%, and that of industrial grade is 90%.
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