In depth analysis of the properties and applications of polyaluminum chloride by Yu Xinhuan

2024-12-10 13:33 238

Author: Kiana     WhatsApp:+86 19139934065     Email:kiana@xhwtm.com


Polyaluminum chloride (PAC) plays an extremely important role in water treatment and many industrial fields today. It is an efficient inorganic polymer coagulant that has attracted much attention for its unique properties and wide applications.

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1. Properties of polyaluminum chloride

(1) Physical properties

Polyaluminum chloride is a yellow or pale yellow solid powder or liquid. Solids are easily soluble in water, forming multi-core hydroxyl complexes. The liquid is colorless to yellowish brown, viscous, with a density greater than water, and increases with the increase of active ingredients.

(2) Chemical properties

Polyaluminum chloride is a complex polymer formed by the combination of aluminum ions (Al ³ ⁺), chloride ions (Cl ⁻), and hydroxyl groups (- OH). It has strong acidity and releases hydrogen ions during hydrolysis, which facilitates the coagulation of impurities. It is chemically stable, but under strong alkaline conditions, it will react and precipitate, resulting in loss of coagulation effect.

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2.  Common uses of polyaluminum chloride

(1) Water treatment field

① Drinking water treatment

Polyaluminum chloride is a key agent that can efficiently remove suspended impurities such as sediment and colloidal particles. The hydrolysis products are adsorbed, electrically neutralized, and bridged to aggregate small particles into large flocs, which facilitate precipitation or filtration. Compared with traditional coagulants, Polyaluminum chloride has a lower dosage, better effect, and less sludge, ensuring water quality safety, reducing turbidity and chromaticity, removing some heavy metals and organic matter, and achieving water quality standards.

②  Industrial wastewater treatment

Polyaluminum chloride plays a significant role in industrial wastewater treatment, as it can remove dyes and additives from printing and dyeing wastewater, reduce chromaticity and COD; In papermaking wastewater, it can coagulate and precipitate fine fibers and fillers, reduce suspended solids, and promote fiber recovery; For electroplating wastewater, it can react with heavy metal ions to form precipitates, remove pollutants such as copper, zinc, and nickel, and reduce environmental pollution. 

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(2) Paper industry

In papermaking production, polyaluminum chloride is mainly used for sizing and retention and filtration assistance. When applying glue, it combines with cellulose to form a protective film, enhancing the paper's water resistance and preventing ink leakage. In terms of retention and filtration assistance, Polyaluminum chloride improves the retention rate of paper fibers and fillers, reduces loss, and enhances paper strength and quality. This not only improves product quality, but also reduces production costs and wastewater treatment load, as it reduces raw material waste.

(3) Pharmaceutical field

Polyaluminum chloride is used in the pharmaceutical industry for drug purification and refining, as a flocculant to remove impurities and large molecular substances from raw material liquids, improving drug purity and quality. In the refining of traditional Chinese medicine extract, it can effectively remove impurities such as tannins and resins, making Chinese medicine preparations purer and more stable, ensuring efficacy and safety.

(4) Cosmetics industry

Polyaluminum chloride is used as a refined raw material in cosmetics production to remove impurities and insoluble particles, resulting in a fine and uniform texture. In the manufacture of face cleaning products, lotion, foundation make-up, etc., it is an important chemical substance in cosmetics production as a water treatment or raw material refining agent to ensure stable product quality, improve safety, and reduce skin allergy.

3. Conclusion

Polyaluminum chloride has excellent performance and is widely used in various fields. With the development of technology, its application will become more profound. It ensures clean water supply, promotes sustainable industrial development, and is an indispensable and important chemical substance, making significant contributions to human production, life, and environmental protection.

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