The development of polyaluminium chloride in China

Polyaluminium chloride at home and abroad, is the rapid development of fine chemical products. In the water treatment is a kind of high efficient flocculant, its research and development of water treatment and fine chemical industry is of great significance. In product development at present, there are two directions. One is to develop new material preparation of polymeric aluminium chloride products, such as aluminum, aluminum ash and slag raw material preparation of polymeric aluminium chloride products, technology is relatively simple, early development more quickly, in recent years the use of industrial wastes (fly ash, coal gangue) as raw materials research should cause enough attention. Using industrial waste as raw materials to produce polyaluminium chloride not only saves the cost of raw materials, and can make the waste recycling, is another market application prospect of research direction is polyaluminium chloride with inorganic or organic polymer flocculant compound or compound with application study, composite or distribution agents can make up for the shortage of the single flocculant, both the advantages of each single flocculant, wide adaptation, it can improve the removal rate of organic matter, reduce the residual concentration of metal ions, can significantly improve the effect of flocculation. In addition, the current domestic production technology of PAC for batch production, more serious pollution, low utilization rate of raw materials, product quality is not stable, continuous development of efficient production process, will become the focus in research of industrial production of polyaluminium chloride in China is mainly used in industrial waste water, tap water purification and other fields, the two fields of consumption accounts for about 70% of the total consumption. Used in industrial sewage purification proportion accounted for more than 40%; Tap water is used in water purification and sewage treatment ratio is around 30%; Industrial circulating water purification and rivers reservoir accounted for 20%; The other 10%. As countries in environmental governance requirements to further improve, usage in industrial wastewater treatment is still will be improved to a great extent.

In recent years, polyaluminium chloride industry has developed rapidly in our country, has reached more than 500 production enterprises, 2005 annual production capacity of 170000 tons/year) (with 30% alumina content of solid products. But the small scale of production enterprises, the annual output in the majority with 2000 ~ 5000 tons; And the obvious regional characteristics of industrial development, mainly distributed in henan, shandong, jiangsu and other regions, in gongyi, henan region has formed the industrial clusters of JiDeShi, annual output of more than 50% of the country. Our country has rich raw material sources, the polyaluminium chloride production cost is relatively low. Polyaluminium chloride production process, such as aluminum, aluminum ash and slag raw material preparation of polymeric aluminium chloride products, technology is relatively simple, early development more quickly, but in recent years, due to containing aluminum, aluminum ash containing aluminum prices, and the use of other products containing aluminum with higher value, with the raw material to produce polyaluminium chloride has been diminishing. With aluminium hydroxide, crystal aluminum chloride as raw material to produce the high cost, calcium aluminate powder as the main production of aluminum sulfate, polymer aluminum, crystal aluminum materials, aluminum hydroxide powder is the alternative products, low price, high aluminum content, etc. , the current domestic general use aluminum hydroxide, crystal aluminum chloride as the raw material preparation of the high grade polyaluminium chloride, calcium powder in the preparation of industrial with polyaluminium chloride, although in recent years our country polyaluminium chloride water purifier industry developed rapidly, but there is still a huge potential market to be exploited. According to statistics, in 2005 the national wastewater emissions of 52.45 billion tons, an increase of 8.7% over the previous year. The industrial wastewater emissions of 24.31 billion tons, an increase of 10.0% over the previous year; Urban sewage emissions by 28.14 billion tons, an increase of 7.7% over the previous year. Although wastewater is so big, but our country sewage treatment efficiency is not high, the urban wastewater treatment rate is lower than 20%, industrial wastewater treatment success rate is less than 70%, nearly a third of the nation’s five types of water quality monitoring section is still worse to lose the ecological function. ’11th five-year’ national will intensify to the treatment of wastewater, the strict control of pollutant total amount at the same time, speed up the construction of urban sewage treatment facilities. The state council has put forward clear requirements: by 2010, the national city urban wastewater treatment rate of no less than 70%. All of these give the industry a huge potential market.