Details on the Types and Applications of Polyaluminium Chloride
Polyaluminium Chloride (PAC) is a new type of water purification material and inorganic polymer coagulant, abbreviated as polyaluminum. It is a water-soluble inorganic polymer that lies between AlCl3 and Al(OH)3.
Polyaluminium Chloride has the following advantages:
Good flocculation: It can quickly form large flocs, improving the purification efficiency.
Less dosage: Compared with other water purification materials, the dosage of polyaluminium chloride is lower.
Fast sedimentation: The treated water can settle quickly, reducing the processing time.
Resistant to low temperatures: It still maintains good flocculation effect at low temperatures.
Widely applicable: It is suitable for various water treatment scenarios.
Polyaluminium Chloride has two forms: liquid and solid.
Liquid Polyaluminium Chloride (PAC): In a non-dried form, it is convenient for loading and unloading, and the price is relatively low.
Solid Polyaluminium Chloride (PAC): The dried form of liquid PAC, convenient for transportation, and no need for tankers. Sometimes there is a caking phenomenon, which is caused by long storage time or poor conditions.
The content and color of Polyaluminium Chloride:
The standard stipulates the content of Al2O3, but in actual production, the content of polyaluminum chloride varies. The content of solid polyaluminum oxide in the market is between 20% and 30%. The higher the water treatment standard, the higher the content, and the higher the price.
The color of polyaluminum chloride is different due to different production raw materials and processes. The color of solid polyaluminum chloride ranges from white, light yellow, golden yellow, brown, and brownish yellow. The color is closely related to the content of polyaluminum chloride.
White Polyaluminium Chloride: Al2O3 content ≥ 30%, low basicity (50%), highest purity. Suitable for food, drinking water, urban water supply, precision manufacturing water purification, paper industry, medicine, sugar production, cosmetics additives, daily chemical industry, etc. The price is the most expensive.
Light yellow Polyaluminium Chloride: Commonly known as “millet yellow”, Al2O3 content is 28%-30%, mainly used for drinking water treatment. The water treated by it is clear without sediment, the powder is fine, the particles are uniform, the flocculation effect is good, the purification efficiency is high and stable, and the dosage is low, the cost is low.
Golden yellow Polyaluminium Chloride: Al2O3 content is around 28%, the production process is generally a plate and frame filter press process. Suitable for industrial water supply, industrial wastewater, industrial water recycling and urban sewage treatment. It is an efficient sewage treatment coagulant, but the price is slightly higher.
Polyaluminium Chloride in brown and brownish packaging: Generally content is below 26%, water insoluble substances are high, known as bulk goods, ordinary goods. The iron content is higher than other polyaluminum products, and the color is darker. Mainly used for sewage treatment. Because it contains iron powder, the color is brown, the more iron powder added, the darker the color. If the iron powder exceeds a certain amount, it is sometimes called polyaluminium chloride iron. Polyaluminium chloride iron combines the advantages of polyaluminum and polyiron, and has a good effect in sewage treatment.
