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What are the main uses of Polyaluminium Chloride?
Polyaluminium chloride (PAC) plays a key role in many fields with its excellent flocculation performance.
In water treatment, it is a powerful assistant for drinking water purification. It can effectively remove suspended matter and colloids in water, reduce turbidity, and ensure the safety of residents' water use; in industrial water treatment, it can remove impurities and meet the water quality requirements of different production processes. In the face of municipal sewage and various industrial wastewaters, such as printing and dyeing wastewater, papermaking wastewater, electroplating wastewater, etc., polyaluminium chloride promotes pollutants to condense into large flocs and settle through electrical neutralization and adsorption bridging, significantly reducing the turbidity, chromaticity, organic matter and heavy metal content of wastewater, and helping to meet the discharge standards.
In the field of industrial production, polyaluminium chloride is also indispensable.
In the papermaking industry, it is used as a retention aid and filter aid to increase the retention rate of fillers and fine fibers, and improve the uniformity and strength of paper; the mining industry uses it to achieve solid-liquid separation of mine wastewater purification and mineral processing; the printing and dyeing industry uses it to remove dyes and chromaticity in wastewater; the foundry industry uses it as a coating additive to optimize coating performance.
In addition, when dehydrating sludge, the synergistic use of polyaluminium chloride and polyacrylamide can accelerate the sludge concentration rate, improve the dehydration efficiency, reduce the sludge moisture content, and create convenient conditions for subsequent sludge treatment.
What is the use of Polyaluminium Chloride?
Polyaluminium chloride (PAC) is a highly efficient inorganic flocculant that plays an important role in many fields.
In the treatment of drinking water, it can quickly condense suspended matter, colloids and impurities in water, reduce turbidity and bacterial content, and ensure water quality safety; in municipal sewage treatment, it can effectively remove organic matter, nitrogen and phosphorus and other pollutants in sewage, and help sewage meet discharge standards.
In the industrial field, it is widely used in wastewater treatment in printing and dyeing, papermaking, electroplating and other industries. Through adsorption bridging and electrical neutralization, it removes heavy metal ions, dyes, suspended matter, etc. in wastewater, and reduces the chromaticity and toxicity of wastewater; in chemical, electric power and other production links, polyaluminium chloride can purify industrial water, prevent equipment scaling and clogging, and ensure stable production operation.
In addition, in sludge dewatering treatment, it is used in conjunction with coagulants to improve sludge dewatering performance, increase solid content, and reduce treatment costs; the mining industry uses it for mine water purification and solid-liquid separation in mineral processing; in the papermaking industry, it is used as a retention and filtration aid to improve paper quality and production efficiency; and it is even gradually showing its application potential in scenarios such as aquaculture water purification and soil improvement.
What are the advantages of Polyaluminium Chloride compared to other water purifiers?
Compared with other agents, polyaluminium chloride has three advantages:
First, the flocculation speed and sedimentation speed are far faster than ordinary water purifiers, which can make turbid water clear quickly;
Second, it has a wide adaptability in the pH value range and can be used regardless of acid or alkali, and the dosage is economical - only a few kilograms are needed for every thousand tons of water, which is 30% less than traditional agents;
Third, it is slightly corrosive, with little wear and tear on equipment, and it is low in cost and easy to prepare. Therefore, it is very popular in water purification, especially in the treatment of water bodies with high turbidity and mixed pollutants.
What are the quality standards of Polyaluminium Chloride?
The quality standards of polyaluminium chloride are mainly regulated from the dimensions of chemical composition, physical properties, application indicators, etc. Different countries and industries have corresponding standard systems.
The Chinese national standard (GB/T 22627-2024) divides PAC into industrial grade and drinking water grade. The core indicators include: alumina (Al₂O₃) content, industrial grade must be ≥28%, drinking water grade ≥30%, this indicator directly affects the flocculation effect; basicity, usually required to be between 40% - 95%, reflecting the stability of the product polymerization form, the higher the basicity, the stronger the flocculation ability but the storage stability may decrease; pH value (10% aqueous solution) is generally 3.5 - 5.0, affecting the applicable water quality range; insoluble matter content, drinking water grade must be ≤0.2%, industrial grade ≤1.0%, too much impurities will affect the water treatment effect; heavy metal indicators, drinking water grade has strict restrictions on lead, cadmium, mercury, etc., such as lead ≤0.001%, to ensure water quality safety.
In addition, international standards such as ISO 21068-3 also stipulate the alumina content, alkalinity, trace elements, etc. of PAC, while industry standards (such as water treatment agent standards) also focus on application performance such as dissolution time and floc sedimentation rate.
Enterprise production must comply with the corresponding standards and verify the compliance of indicators through test reports to ensure the effectiveness and safety of products in different water treatment scenarios.
What are the precautions for Polyaluminium Chloride during storage and transportation?
For those who use polymeric chlorination, it is necessary to pay attention to things like this during the process of storage.
The first word is that polymeric chlorination should be placed in a dry, transparent and safe place. Its properties are easy to deliquescence. If it encounters moisture, it is easy to cause products to be damaged. Therefore, it must be placed in a dry place to avoid the invasion of water. And its storage devices are suitable for anti-corrosion, such as plastic buckets, plastic buckets, etc. In order to prevent the biochemical reaction of its container, and its own properties. And if it is not stored, there is no clear reason to use it, so that the user knows its characteristics and uses, so as not to use it.
The next time it is used, it is necessary to cover it. The outer package can resist bumps and collisions on the way to prevent breakage. If the package is broken, it will be exposed to the air, deliquescence will occur, and it may cause pollution to the surrounding environment. It also clears the dryness and leaves other chemicals behind, so as to avoid adverse reactions caused by polymerization chlorination. In addition, polymerization chlorination is not flammable, explosive and oxidizing. Because of its chemical properties, if this material is mixed, it is afraid of life-threatening reactions, and it will become a problem. And people are familiar with the method of emergency management. In case of package damage, leakage, etc., they can quickly take effective measures, such as covering and collecting with dry sand, to avoid pollution.
In this case, polymeric chlorination is not used for storage or storage. It is necessary to pay attention to the safety of the product.