What Are the Differences Between Different Colors of Polyaluminium Chloride?

Polyaluminium Chloride (PAC) is a versatile chemical compound widely used in water treatment, industrial processes, and various applications. One notable characteristic of PAC is its different colors, which indicate variations in raw materials, production processes, and applications. In this article, we will explore the differences between white, light yellow, yellow, and brown PAC, shedding light on their unique properties, applications, and how to choose the right color for your needs.

White Polyaluminium Chloride (High-Purity Iron-Free PAC)

White Poly Aluminium Chloride, also known as High-Purity Iron-Free White Poly Aluminium Chloride or Food-Grade White Poly Aluminium Chloride, is a superior-quality product compared to conventional Poly Aluminium Chloride.

Raw Materials and Production Process

It is primarily composed of premium-grade aluminum hydroxide powder and hydrochloric acid, utilizing advanced domestic and international spray drying technology in the production process. This specialized manufacturing process ensures the absence of iron impurities, resulting in a pure and high-quality product.

Quality and Characteristics

  • High Purity: White PAC is known for its exceptional purity, making it suitable for applications demanding stringent water quality standards.
  • Effective Coagulation: It exhibits excellent coagulation performance and stability in various water treatment processes.
  • Iron-Free: The absence of iron impurities eliminates concerns related to discoloration or contamination.

Applications

White PAC is widely employed in the treatment of drinking water due to its compliance with health and safety standards and used in industrial processes where maintaining high-purity standards is essential. White PAC can also be used in papermaking sizing agents, sugar decolorizing clarifiers, tanning, cosmetics, precision casting and other fields.

Light Yellow Polyaluminium Chloride

Raw Materials and Production Process

Light Yellow PAC is formulated from high-grade aluminum raw materials and hydrochloric acid. The light yellow color indicates a lower concentration of iron impurities compared to standard yellow PAC.

Characteristics and Applications

The mid-to-high series products, ranked just below white Poly Aluminium Chloride, find primary application in the treatment of drinking water. Stringent restrictions on heavy metal content are observed in our production of drinking water-grade Poly Aluminium Chloride.

The treated water exhibits exceptional clarity, free from any precipitation, with fine powder, uniform particles, delivering a strong flocculation effect. The purification process is efficient and stable, requiring minimal dosage and resulting in cost-effectiveness.

Yellow Polyaluminium Chloride

Yellow polyaluminum chloride is the most widely used polyaluminum chloride on the market.

Raw Materials and Production Process

Yellow Poly Aluminium Chloride is produced using calcium aluminate powder, hydrochloric acid, and bauxite as key raw materials. Primarily applied in sewage and drinking water treatment, the production process for drinking water treatment involves aluminum hydroxide powder, hydrochloric acid, and a minor quantity of aluminum. 

The processing of yellow PAC powder employs either the filter press process or the spray drying process. Given the stringent heavy metal requirements for drinking water treatment, both the raw materials and production processes are superior compared to those of brown Poly Aluminium Chloride.

Characteristics and Applications

Yellow PAC offers effective coagulation and flocculation properties, making it suitable for various water treatment processes. Whether it is industrial water supply, industrial wastewater, industrial water circulation and urban sewage treatment, yellow PAC is the best choice.

Brown Polyaluminium Chloride

Brown PAC is a water treatment product produced according to the special requirements of individual customers for water treatment.

Raw Materials and Production Process

Brown Poly Aluminium Chloride is crafted from calcium aluminate powder, hydrochloric acid, bauxite, and iron powder. The production process involves the utilization of a drum drying method, typically applied in sewage treatment.

The addition of iron powder imparts a tan color to the product, with the depth of color directly proportional to the quantity of iron powder added. Exceeding a specific threshold of iron powder results in a darker hue, leading to a variant known as polyaluminum ferric chloride.

Characteristics and Applications

Brown PAC, just as we mentioned above, with added iron powder, exhibits a distinctive tan color, making it suitable for applications where this coloration is acceptable. Ideal for sewage and industrial wastewater treatment, its unique composition facilitates effective coagulation and flocculation processes.

Compared with yellow PAC, brown PAC is more cost-effective if the requirements for PAC ingredients are not particularly strict.

Considerations for Choosing the Right PAC Color

1. Application Requirements

Consider the specific requirements of the application, such as water quality standards, to determine the most suitable PAC color.

2. Cost Considerations

Balance the cost-effectiveness of different PAC types with the application’s budgetary constraints.

3. Purity Standards

For applications demanding high-purity standards, such as drinking water treatment, opt for white or light yellow PAC.

4. Impurity Tolerance

Evaluate the impurity tolerance of the application; applications permitting slight discoloration may opt for yellow or brown PAC.

5. Coagulation Efficiency

Assess the coagulation efficiency required for the specific water treatment process and choose the PAC color accordingly.

Conclusion

The color variations in Polyaluminium Chloride (PAC) signify differences in raw materials, production processes, and applications. White PAC and Light Yellow PAC are ideal for applications demanding high purity, such as drinking water treatment, while Yellow PAC and Brown PAC provide cost-effective solutions for various water treatment scenarios. 

Choosing the right PAC color involves a careful consideration of application requirements, cost constraints, purity standards, impurity tolerance, and coagulation efficiency. By understanding these differences, users can make informed decisions, optimizing their water treatment processes, and ensuring the desired quality standards are met.

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