Polyaluminum chloride is a water purification material, an inorganic polymer coagulant, and a polymer with a relatively large molecular weight and a relatively high charge of inorganic polymer produced by the bridge action of hydroxyl ions and the polymerization of polyvalent anions. Pharmacy. In form, it can be divided into two kinds: solid and liquid. The solids are divided into brown, beige, golden yellow and white according to different colors, and the liquid can be represented as colorless, transparent, yellowish, light yellow to yellow-brown.

The polyaluminum chloride having a content of aluminum oxide between 27 and 30 is mostly khaki-yellow yellow solid powder. These types of polyaluminum chlorides have relatively good water solubility, and in the course of dissolution, physicochemical changes such as electrochemical, agglomeration, adsorption, and precipitation eventually lead to [Al2(OH)3(OH)3] precipitation, thereby achieving the purpose of purification. In the use of polyaluminum chloride, without the need for other additives, floe formation is fast and thick, high activity, rapid precipitation, and a clear effect on high turbidity water purification.

In the treatment of potable water, the polyaluminum chloride coagulant used can only be white polyaluminum chloride, but it cannot be yellow common polyaluminum chloride. Why is this?
Yellow polyaluminum chloride is abbreviated as PAC, which is a water-soluble inorganic polymer polymer between ALCL3 and AL(OH)3. White polyaluminum chloride is spray-dried from aluminum hydroxide powder and high purity hydrochloric acid. A white or milky white powdered fine powder, which melts when exposed to air, can only be used as a white polyaluminum chloride in the treatment of potable water. It cannot be a yellow polychlorinated chloride. The reason for aluminum is that it has a great relationship with the effective substance content and performance index of these two products.
The aluminum content of ordinary polyaluminum chloride, which is yellow polyaluminum, is significantly lower than that of white polyaluminum chloride. In potable water treatment, in order to accelerate the reaction rate, a high content of polyaluminum chloride is used, and, The basicity of salt is also an important factor in the reaction of polyaluminum chloride products. The normal yellow polyaluminum chloride has a salty degree of 80% or 90%, while the white polyaluminum chloride has a salty basicity of only about 50%. That is, ordinary polyaluminum chloride has a high content of heavy metals. Excessive heavy metal content will affect the safety of drinking water. In summary, common polyaluminum chloride cannot be used for the treatment of potable water, while white polyaluminum chloride is more suitable. Used in potable water treatment.

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