Polyaluminum Chloride (PAC), as an important water treatment agent, plays a crucial role in the fields of sewage treatment and water purification. The raw materials of yellow polyaluminum chloride include calcium aluminate powder, hydrochloric acid, bauxite, etc., and it is mainly used in sewage treatment and drinking water treatment. The raw materials for polyaluminum chloride used in drinking water treatment are aluminum hydroxide powder, hydrochloric acid, and a small amount of calcium aluminate powder, and the production adopts plate - and - frame filter pressing or spray drying process. It has a very wide range of application scenarios, covering papermill sewage treatment, oil production, daily sewage treatment, pharmaceutical wastewater treatment, printing and dyeing sewage treatment, tailings water treatment and drinking water purification and other aspects. In terms of appearance, it is mostly yellow powder. Products of different specifications differ in indicators such as alumina content, alkalinity, and water insoluble substances, and the content of harmful components such as heavy metals is extremely low, ensuring the safety of use. With its excellent water treatment performance, polyaluminum chloride provides strong support for the recycling of water resources and water quality improvement in various industries, and has become an important force in protecting the water environment.