Polyaluminium chloride is a highly efficient flocculant, often used in municipal sewage and industrial wastewater treatment. It has the characteristics of high efficiency and stability. When we talk about PAC, one of the indicators often mentioned is basicity. So what is basicity? What effect does basicity have on the quality of polyaluminium chloride? Understanding this concept will have a great impact on the selection of polyaluminium chloride.
What is basicity in polyaluminium chloride?
In PAC, basicity refers to the molar ratio of hydroxyl groups to aluminum ions. It is usually expressed as basicity (B):
B = [OH-] / [Al3+]
Basicity is one of the most important performance indicators of polyaluminium chloride. It directly affects the flocculation effect of PAC.
Our company supplies various types of PAC with a basicity from 40% to 90%.
The mechanism of the influence of basicity on polyaluminium chloride
Basicity affects the performance of PAC by affecting the polymer morphology and charge distribution of PAC. Alkalinity determines the degree of polymerization of aluminum hydroxyl complexes in PAC. Higher basicity is conducive to the formation of PAC with high polymerization degree and improves its flocculation effect. And the basicity will affect the positive charge distribution of PAC and its adsorption capacity for negatively charged substances.
Effect of basicity on PAC:
Appropriate basicity can optimize the flocculation effect of polyaluminium chloride. Too low basicity will lead to insufficient hydrolysis of PAC and reduce the flocculation effect.
Basicity will also affect the size, density and sedimentation rate of polyaluminium chloride condensed flocs. Appropriate basicity can handle this aspect very well.
Therefore, it is particularly important to choose the appropriate PAC model according to your needs.
We can provide the following PAC models:
| Item | PAC-I | PAC-D | PAC-H | PAC-M | PAC-G |
| Appearance | Yellow powder | Yellow powder | White powder | Milk powder | Milky White powder |
| Content (%, Al2O3) | 29±1 | 30±1 | 30±1 | 30±1 | 30±1 |
| Basicity (%) | 40 – 90 | 40 – 90 | 40 – 90 | 40 – 90 | 40 – 90 |
| Water insoluble matter (%) | 1.0 MAX | 0.6 MAX | 0.6 MAX | 0.6 MAX | 0.6 MAX |
| pH | 3.0 – 5.0 | 3.0 – 5.0 | 3.0 – 5.0 | 3.0 – 5.0 | 3.0 – 5.0 |
We conduct strict quality control on our polyaluminium chloride partner factories and can make accurate model recommendations according to different customer needs, providing customers with high-quality PAC that meets their needs. Our sales team has rich experience in product selection and can provide customers with professional advice and highly qualified samples for customers to conduct beaker experiments.
If you are looking for a reliable PAC Supplier for drinking water treatment, industrial wastewater treatment or other applications, we can provide custom PAC to meet your needs. Contact us now to learn more about our high-performance PAC products and get a competitive quote!
Post time: Mar-27-2025
