Polyaluminium chloride, abbreviated as polyaluminum or polyaluminum chloride, abbreviated as PAC, is also commonly referred to as water purifying agent or coagulant. Its main component is aluminum oxide, i.e. alumina. The general chemical formula is [Al2 (OH) nCl6-n] m (m ≤ 10, n = 1 ~ 5)
Due to different standards, the classification methods of polyaluminium chloride are also diverse. If classified by form, it can be divided into liquid polyaluminum chloride and solid polyaluminum chloride; According to the classification of drying process, it is divided into drum type polyaluminium chloride and spray drying polyaluminum chloride. It can be divided into high-purity polyaluminum chloride, drinking water grade polyaluminum chloride and industrial grade polyaluminum chloride according to the scope of use. At present, the industry generally adopts the classification method according to the different scope of use. Polyaluminum chloride is divided into high-purity polyaluminum chloride, drinking water grade polyaluminum chloride and industrial grade polyaluminum chloride.
So what are the categories of polyaluminium chloride?
1. high purity polyaluminium chloride, also known as food grade polyaluminium chloride, is a milky white powder. The main raw materials are high quality aluminum hydroxide and hydrochloric acid, and the most advanced technology is spray drying. High purity polyaluminium chloride is widely used in drinking water, urban water supply and precision manufacturing water purification, especially in papermaking industry, medicine, sugar refining, cosmetic additives, daily chemical industry and so on.
2. drinking water grade polyaluminium chloride, the product is light yellow powder. The main raw materials are aluminum hydroxide, calcium aluminate and hydrochloric acid. The most advanced technology is spray drying. Drinking water grade polychlorinated aluminum is widely used in drinking water, urban water supply and industrial water purification.
3. industrial grade polyaluminium chloride, the product is golden yellow powder, the main raw material is calcium aluminate powder, bauxite and hydrochloric acid, the production technology is spray drying process or drum drying process. Industrial grade polyaluminium chloride is mostly suitable for industrial water supply, industrial wastewater, industrial circulating water and urban sewage purification.
Polyaluminium chloride is a water-soluble inorganic polymer coagulant. Due to its fast flocculation and sedimentation speed, wide applicable pH value range, no corrosion to pipeline equipment and obvious water purification effect, it can effectively support the color SS, COD, BOD, arsenic, mercury and other heavy metal ions in water. It is widely used in drinking water, industrial water and sewage treatment.