Common problems in the use of polyaluminium chloride

Polypolyaluminum chloride (PAC) is also known as basic aluminium chloride or coagulant, which is a water-soluble inorganic polymer, the colour is yellow or light yellow, with strong adsorption capacity. In the process of hydrolysis, coagulation, adsorption, precipitation and other physical and chemical reactions can occur. In actual production, it is widely used, and according to different uses, there are a variety of different forms, the most important being liquid, solid and so on, playing an important role.

Polyaluminum chloride is highly corrosive and absorbs moisture, has abrasion, and a low added value, so the requirements for drying equipment in material selection, configuration optimisation, energy saving, and consumption reduction are very high. The most commonly used drying methods for polyaluminum chloride are the drum dryer and spray dryer. The traditional drying method is the drum dryer, which uses saturated steam as the heat source. However, the polyaluminum chloride solution is particularly corrosive under higher working temperature conditions, leading to a short service life for the equipment, limited drum diameter, and small output for a single machine. This results in high energy consumption, poor product quality, a poor operating environment, and greater harm to the operator. Poly-aluminum chloride powder products produced by spray drying have good dispersion and fast dissolution speed in water. White polyaluminum chloride will melt when exposed to air, while ordinary polyaluminum chloride is made by natural precipitation after roller drying. Red polyaluminum chloride is a red or milky white milk powder processed by spray drying of aluminium hydroxide powder and high-purity hydrochloric acid.