What are the perfect production techniques for using PAC in water quality improvement? After a large number of applications proved that the use of PAC to replace the traditional iron, aluminum salt coagulant, can significantly improve the water purification efficiency, reduce processing costs, improve effluent quality. Improve the coagulation performance of polyaluminum chloride; the effect of decontamination of high turbidity water and low temperature low turbidity water is particularly obvious, improving water quality is undoubtedly an imminent event, many experts reached a consensus on this. How to improve water quality, the experts believe that more effective control of pollution, improve water is the fundamental way. Polyaluminum chloride not only has a strong coagulation and turbidity removal effect, but also has significant bleaching and humus removal. In the same treatment conditions to achieve the best flocculation, the required dosage of aluminum polyalkylene to reduce the traditional 2/3 as much. Under the same dosage conditions, the use of polyaluminum chloride to obtain lower residual turbidity than the traditional aluminum salts, so the same treatment results can be obtained at lower doses. In addition, polyaluminium chloride is used in a wider pH range than conventional aluminum salts. Generally, when the low temperature water (& lt; 5 ℃), coagulant turbidity efficiency of traditional coagulants is obviously decreased and lead to deterioration of effluent quality. However, the use of polyaluminum, whether low or normal temperature water, can obtain better coagulation Turbidity effect. In addition, the polymerization of aluminum can significantly improve the solid-liquid separation efficiency, sedimentation and filtration to improve sludge dewatering performance, thereby reducing the residence time of the settling tank and increase water production. In addition, filtration and sludge dewatering are facilitated due to the large and compact flocs produced. So what is the perfect production process of polyaluminum chloride? Today to give everyone to explain this issue, so that we have more understanding of polyaluminum chloride. 1, alkali-soluble first aluminum ash and sodium hydroxide to obtain sodium aluminate solution, and then adjust the pH value of hydrochloric acid to prepare polyaluminum chloride solution. This approach produces better appearance of the product, less water insolubles, but high sodium chloride content, high raw material cost, low alumina content in solution, and high cost of industrialization. 2, and the law is the first law with hydrochloric acid and sodium hydroxide and aluminum ash echo. Separate from the system of aluminum chloride and sodium aluminate, then the two solutions mixed and neutralized. Namely, a polyaluminum chloride liquid is obtained. Products consumed by this method insolubles impurities less, but the cost is higher. First with hydrochloric acid and aluminum foil reverberation, then the obtained aluminum chloride is divided into two parts, part of ammonia with ammonia pH value of 6 ~ 6.5 to obtain aluminum hydroxide. Then another part of the aluminum chloride into the aluminum hydroxide to make it reverberant. Polymeric aluminum chloride liquid products obtained monotonous solid products obtained after the allegedly aluminum content of products and indicators such as the degree of base are high. 3, the original battery method The process is an acid-soluble aluminum step improvement process, based on electrochemical theory. Metallic aluminum and hydrochloric acid reacts to form a primary battery. A metal mesh made of copper or stainless steel or the like is placed at the bottom of the drum-shaped reverberation chamber as the cathode. The aluminum scraps, which are turned upside down, act as anodes and are intercepted by hydrochloric acid to terminate the reaction. PAC. The process can be applied in response to the bubble floating in the solution so that the solution orientation movement, 庖 behalf of mechanical stirring, greatly saving energy consumption.