For procurement specialists and chemical engineers, a thorough understanding of the materials they work with is paramount. Polyaluminum Chloride (PAC) is a widely used water treatment chemical, known for its efficacy as a coagulant. This article aims to provide a comprehensive overview of PAC, including its chemical properties, applications, and best practices for its use, drawing insights from reputable manufacturers and suppliers.

Polyaluminum Chloride (PAC) is an inorganic polymer coagulant with the general chemical formula [Al2(OH)nCl6-n]m. Its CAS number is 1327-41-9. The effectiveness of PAC stems from its ability to neutralize the negative charges of suspended particles in water, causing them to destabilize and aggregate into larger flocs. These flocs then settle out of the water more easily, leading to improved clarity and reduced turbidity. The molecular structure, often characterized by a Keggin-type polymeric ring chain, provides a powerful bridging effect that enhances the coagulation process.

The appearance of PAC can vary, but it is commonly available as a yellow powder or in liquid form. As a powder, it typically comes in 25kg bags, making it convenient for storage and handling by industrial users. Its neutral acid-base property and function as a surface disposal agent highlight its suitability for a range of water treatment scenarios. When considering purchasing PAC, buyers often look at specifications like alumina content (commonly 28-30% for first-grade products) and basicity (40-90%) to ensure optimal performance for their specific water treatment goals.

Best practices for using PAC involve careful consideration of several factors. Firstly, proper dosage is critical and is typically determined by water quality analysis, including parameters like pH, turbidity, and temperature. It is advisable to conduct jar tests to identify the optimal dosage for a particular water source. Secondly, pH adjustment is often necessary; PAC works most effectively within a specific pH range (3.5-5.0 for a 1% aqueous solution), and users may need to adjust the water's pH accordingly before or during PAC application. Proper stirring and mixing are also essential to ensure the PAC is thoroughly dispersed and in complete contact with the pollutants.

Precautions are also important when handling PAC. It is recommended to wear appropriate protective equipment, such as gloves and goggles, to avoid skin and eye contact. Storage should be in a dry, well-ventilated area to prevent moisture absorption, which can affect its efficacy. When comparing different PAC chemical suppliers, consider not only the price but also their adherence to safety standards and their ability to provide detailed handling instructions.

For businesses seeking to buy Polyaluminum Chloride, partnering with a reliable manufacturer and supplier, such as those found in China with robust export capabilities, is key. These suppliers can offer technical support, product samples, and competitive pricing, ensuring that you receive a high-quality water treatment chemical that meets your operational needs effectively and safely. Understanding the technical specifications and recommended usage protocols of PAC will enable better procurement decisions.