Polyaluminum chloride is a widely used water purification product, and many people are not very familiar with it. Polyaluminum chloride is divided into industrial grade and drinking water grade, and the content of polyaluminum chloride is also divided into many types. The price of polyaluminum chloride varies depending on the content. What are the important indicators of polyaluminum chloride? The basicity of PAC polyaluminum chloride is an important technical indicator, so what does the basicity of polyaluminum chloride represent?
The industrial grade water treatment agent polyaluminum chloride standard GB/T 22627-2022 specifies a basic degree of 20-98% for polyaluminum chloride, while the standard GB 15892-2020 for polyaluminum chloride used in drinking water specifies a basic degree of 45-90% for drinking water grade polyaluminum chloride. The higher the basicity of polyaluminum chloride, the higher the degree of polymerization and molecular weight. Polyaluminum chloride with higher basicity has better performance, and manufacturers using polyaluminum chloride are more willing to purchase those with higher basicity.
The manufacturer of polyaluminum chloride simply uses bauxite and hydrochloric acid to produce polyaluminum chloride, which has a relatively low basicity. At this time, it is necessary to add calcium aluminate powder to adjust the basicity of liquid polyaluminum chloride to the appropriate range, and add calcium aluminate powder to increase the polymerization degree of polyaluminum chloride.
Manufacturers producing polyaluminum chloride must adjust the basicity to a suitable range in order to achieve good product performance. Polyaluminum chloride with low basicity has poor coagulation effect, relatively high dosage, and high usage cost.
So are there any low salt content polyaluminum chloride products on the market? The answer is yes, such as white polyaluminium chloride produced using hydrochloric acid and aluminum hydroxide powder, which usually has a salt content of around 50%. Although white polyaluminum chloride has a low salt content, it is generally used in industries such as cosmetics and papermaking, and the price is relatively higher.
