How to solve the caking problem of polyaluminum chloride?

Polyaluminum chloride has adsorption, condensation, precipitation and other properties, its stability is poor, corrosive, such as accidentally splashed on the skin to immediately rinse with water. Polyaluminum chloride has the advantages of good spray drying stability, wide water area, fast hydrolysis rate, strong adsorption capacity, large alum formation, fast quality dense precipitation, low turbidity of the water, good decolorization performance and so on. Therefore, polyaluminum chloride is also referred to as high efficiency polyaluminum chloride, high efficiency PAC or high efficiency grade spray drying polyaluminum chloride. Polyaluminum chloride is suitable for all kinds of turbidity of raw water, pH application range is wide, but compared with polyacrylamide, its settling effect is far less than polyacrylamide.

The basicity of polyaluminum chloride is a relatively important indicator in polyaluminum, especially for potable water grade polyaluminum products. Because want to polyaluminum chloride caking will obviously have the use effect, many users suffer from the caking condition of polyaluminum chloride will be helpless, the key reason for this situation is that polyaluminum chloride belongs to a polymer polymer, its own molecular weight control is large, if a one-time into the water to put a lot of polyaluminum chloride, Polyaluminum chloride is difficult to distribute to contact water, dissolve.

One of the important conditions to accelerate the dissolution rate is to increase the contact area between the solute and the solvent. The reason why the powder dissolves quickly is because the same quality of the solute, the smaller the particle, the larger the contact area with the solvent. However, many powdery substances have certain viscosity after encountering water. It is precisely because of this viscosity that the outer layer of wet polyaluminum chloride covers the inner layer of dry polyaluminum chloride to form a mass, which greatly reduces the contact area between polyaluminum chloride and water. In the outer layer of dissolution, a new "shell" is formed compared with the inner layer of polyaluminum chloride, so it is very slow to dissolve. The efficiency of the formation of polyaluminum chloride in the application process is very low.