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Metal aluminum method: the reaction speed is relatively fast, and a certain amount of polyaluminum chloride can be obtained in a short time. Moreover, aluminum metal is relatively widely available, which provides a certain guarantee for large-scale production.

Aluminum chloride (PAC) and polyaluminum ferric chloride (PAFC) are two commonly used inorganic polymer flocculants, the main differences are as follows:

White polyaluminum chloride (also known as spray drying polyaluminum chloride) is widely used in many fields because of its high purity and low impurity characteristics. The following are its core application scenarios and technical advantages:

The main differences between ferrous sulfate and polymeric ferric sulfate are reflected in chemical properties, treatment effects, application scenarios and environmental adaptability, as follows:

The average market price of industrial grade polyaluminum chloride in 2023 decreased from 2033.75 yuan/ton at the beginning of the year to 1777.50 yuan/ton at the end of the year, with an annual decline of 12.6% and a maximum amplitude of 16.41% during the year. In 2024, there will continue to be a downward trend, with the main price of solid (content ≥ 28%) dropping to 1781.25 yuan/ton in May, a decrease of 0.70% from the beginning of the year. By April 2025, the ex factory price of industrial grade (30% spray) in Henan Province will be about 1660 yuan/ton, 18.4% lower than the peak in 2023.

The content detection of polyferric sulfate usually refers to the measurement of the content of its main component - iron ion. As polyferric sulfate is a complex inorganic polymer compound, its detection methods are diverse, covering chemical analysis and instrumental analysis.

The following are 15 core indicators commonly used in sewage treatment and their function descriptions, covering key parameters such as organic matter, nutrients, physical properties and microorganisms:

According to the existing technical documents and production process practice, the production process of polyaluminum ferric chloride (PAFC) is summarized as follows:

I. Mainstream production process classification

1. Acid dissolution one-step method

• Raw materials: aluminum ash, aluminum slag, bauxite, iron ore and other aluminum iron minerals
• process sequence:
• ① Raw material crushed to 40-60 mesh → ② mixed with hydrochloric acid/sulfuric acid (conditions: 80-100℃,3-5 atmospheres) → ③ added high alumina ash to adjust polymerization → ④ precipitation separation → ⑤ liquid or solid product (spray/drum drying)
• Features: low cost, fast reaction, but heavy metal impurities need to be strictly controlled

As an important inorganic polymer flocculant, polyferric sulfate has been widely used in the field of water treatment because of its advantages such as good flocculation effect, fast settling speed and wide application range.