Industry News

PAC color classification and corresponding levels
The color difference of PAC directly reflects its purity level and core components, which are mainly divided into four levels:

In sewage treatment, the combined use of PAC (polyaluminum chloride) and PAM (polyacrylamide) is a classic combination in the industry. The fundamental reason lies in the complementary mechanism and synergistic effect of the two, and the best treatment effect cannot be achieved by using them separately. The following is a point-by-point analysis of the core reasons:

According to the comprehensive analysis of existing regulations and chemical properties, polyaluminum chloride (PAC) is not a legal dangerous goods, but due to its chemical properties, the use and storage should strictly comply with safety specifications. The specific analysis is as follows:

1. Screening of core quality indicators

1.Alumina content (Al₂O₃)

● Industrial grade: ≥28% (plate frame/spray type), drinking water grade: ≥30%;

● Note: High content (30%) may be ineffective in acidic/low turbidity water and should be matched to the water quality

Roller-dried polyaluminum chloride (PAC), a highly efficient flocculant for water treatment, is widely used in both water purification and wastewater management. As a solid form of polyaluminum chloride (PAC), it is manufactured through a drum-drying process, offering advantages such as convenient storage and high efficiency. Below I will elaborate on key aspects:

According to "PAC for drinking water" (GB15892-2020), the key indicators include:

Alumina (Al₂O₃) content: liquid> or equal to 10%, solid> or equal to 29%, to ensure flocculation efficiency.

The normalization of environmental restrictions has led to the exit of small and medium-sized production capacities. For example, in the PAC production area of Gongyi, Henan, the price of Q1 increased by 10% in the short term due to environmental restrictions in 2025. In the long run, environmental inspections have eliminated low-end production capacities (such as low-purity products produced using the drum method), leading to increased industry concentration and stronger bargaining power for leading companies.

Drinking water-grade liquid polyaluminum chloride is a high-purity inorganic polymer coagulant specifically designed for drinking water purification. Its chemical formula is [Al₂(OH)ₙCl₆−n]m[Al₂​(OH)ₙ​Cl₆−n​]m​. The product strictly complies with China's "Hygienic Standard for Drinking Water" regarding heavy metal residue levels (arsenic ≤0.0005%, lead ≤0.001%) and salt base content (40%-60%). Compared to industrial-grade products, it demonstrates distinct advantages: