Polyaluminum chloride domestic production process of discussion Poly aluminum chloride aluminum acid acid one-step solution is the first domestic technology in 1971, after a stage found in the aluminum ash contained in the heavy metals and toxic substances were dissolved, the Purification methods produced by the water purifier can not be used for drinking water preparation, can only be used for industrial wastewater treatment. Poly aluminum chloride aluminum slag acid-soluble two-step method is improved on the basis of the above process, although the quality of the purifying agent has improved, but still can not be used for drinking water preparation, polyaluminium chloride and more for industrial wastewater Treatment; aluminate acid one-step acid dissolution method since 1982 in Henan Province, Shandong Province, commonly used at room temperature and pressure process, the quality of the purifying agent produced has been increased. Can be widely used in the preparation of drinking water and industrial wastewater treatment. But this method because of the production process of acid mist everywhere and a lot of waste, a great harm to the surrounding environment. Polychlorinated aluminum chloride in this process has also been gradually eliminated. Bauxite acid dissolves one-step or two-step process, which has been in Shanghai and Hangzhou since 1990. It is a kind of pressurization and heating process. The quality of purifying agent produced is good and gradually replaced by aluminum sulfate, Production and application of various processing techniques. The process has no acid mist to escape during the production process, less waste residue, and some waste residue can be used for firing brick and cement, less damaging to the surrounding environment. Therefore, this kind of process has gained a firm foothold in China and has been used till now. Aluminum laterite high temperature and pressure calcium aluminate two-step method of renewal, the process in 1998 in Zhangzhou, Fujian, Shishi, Xiamen and Zhejiang Pingyang rise, aluminum laterite from the local precious resources, proven and Shanghai Tongji University, the State Environmental Protection Department of the test , Which is a new and efficient aluminum-iron polymerization agent. Nowadays, its development situation is very good. In addition to being suitable for the preparation of drinking water, this polyaluminum chloride water purifying agent has particular effect on wastewater treatment of oil-bearing and heavy metal-contaminated wastewater .