Development of PAC in China
Polyaluminum chloride (also known as PAC, polyaluminum, polyaluminum chloride) iron is a fast-growing fine chemical product, whether at home or abroad. It is an efficient flocculant in water treatment, and its research and development is of great significance to water treatment and fine chemicals. There are currently two directions in product development. The first is to develop new materials to prepare polyaluminum ferric chloride products, using aluminum scraps, aluminum ash and aluminum slag to prepare polyaluminum ferric chloride products. The process is relatively simple and the early development is relatively rapid. In recent years, industrial production waste has been used ( The research on fly ash and coal gangue as raw materials should attract enough attention.
The use of industrial waste as a raw material to produce polyaluminum ferric chloride not only saves material costs, but also enables the recycling of waste. It is a very promising research field in the market. Another direction is polyaluminum ferric chloride and inorganic or organic Research on the composite or compound application of polymer flocculants. Compound or compound agents can make up for the shortcomings of single flocculants, have the advantages of each single flocculant, have a wide range of applications, can increase the removal rate of organic matter, and reduce residual metals Ion concentration can significantly improve the flocculation effect. Poly Aluminum Ferric Chloride Polyaluminum Chloride is an inorganic polymer coagulant. It produces inorganic polymer water with larger molecular weight and higher charge due to the bridging effect of hydroxide ions and the polymerization of polyvalent anions. The characteristics of treatment chemicals are mainly determined by the working principle of the pressure atomizer. In addition, the current domestic PAC production process is mostly intermittent production, which has serious pollution, low raw material utilization rate and unstable product quality. The development of high-efficiency continuous production processes will definitely become a hot spot for industrial production research in my country. The main application of polyaluminum ferric chloride in China In the fields of industrial sewage, tap water supply and purification, the consumption of these two fields accounts for about 70% of the total consumption.
The proportion used in industrial sewage purification accounts for more than 40%; the proportion used in tap water purification and domestic sewage treatment is about 30%; industrial circulating water and river reservoir purification account for 20%; others account for 10%. With the country's further improvement of environmental protection management requirements, the amount of use in industrial wastewater treatment will continue to increase substantially.