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Polyaluminum chloride is a commonly used inorganic polymer flocculant. The wide range of sources of raw materials for the production of polyaluminium chloride has laid the foundation for its development. In particular, the variety of production processes provides convenience for the development of polyaluminum chloride.

International and domestic production and application of inorganic polymer flocculants have taken shape, and theoretical research has also achieved in-depth development. The preparation materials mainly include bauxite, aluminum hydroxide, waste molecular sieve catalyst, etc., and the preparation methods mainly include wet method and electrolysis method. Some scholars believe that waste aluminum foil has a high economic value of recycling. He experimentally studied the optimum conditions for the preparation of polyaluminum chloride from waste aluminum foil and the scope of application of purified water.

With the development of industry and the rapid growth of urban population, water pollution has become increasingly serious, and the amount of sewage that needs to be purified has also increased, and the demand for water purification agents has been increasing. Due to the unequal number of hydroxyl groups in the polyaluminum chloride molecule, when the polyaluminum chloride is added to the turbid source water, the hydrolysis continues under the pH condition of the source water, accompanied by a series of physics and chemistry such as coagulation, adsorption and precipitation. Process to achieve the purpose of purifying water. The source of waste aluminum foil is very extensive, mainly from cigarettes, food and pharmaceutical packaging. Its main component is metal aluminum, which has high economic and social value of recycling. Through experimental research, the optimal conditions and application scope of polyaluminum chloride made of waste aluminum foil have certain practical significance in improving resource utilization and protecting the environment.