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Polyaluminium chloride is a common inorganic polymer flocculant. The extensive sources of raw materials for the production of polyaluminium chloride laid the foundation for its development. Especially the variety of production process provides convenience for the development of polyaluminium chloride.

The production and application of inorganic macromolecule flocculants have been on a large scale both at home and abroad, and the theoretical research has also made in-depth development. The main raw materials are bauxite, aluminium hydroxide and spent zeolite catalysts. The main preparation methods are wet process and electrolysis. Some scholars believe that scrap aluminium foil has high economic value of recycling. He studied the optimum conditions for the preparation of polyaluminium chloride from scrap aluminium foil and the application scope of purified water through experiments.

With the development of industry and the rapid growth of urban population, the pollution of water resources is becoming more and more serious. The sewage that needs to be purified and treated is also increasing, and the demand for water purifiers is increasing. Because the polyaluminium chloride molecule contains different amounts of hydroxyl groups, when polyaluminium chloride is added to turbid source water, hydrolysis continues under the condition of pH of source water, accompanied by a series of physical and chemical processes such as condensation, adsorption and precipitation, so as to achieve the purpose of purifying water. Scrap aluminum foil comes from a wide range of sources, mainly from cigarettes, food and pharmaceutical packaging, and its main component is metal aluminum, which has high economic and social value of recycling. The experimental results show that the optimum conditions and application range of polyaluminium chloride made from scrap aluminium foil are of practical significance in improving resource utilization and protecting environment.