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The Comprehensive Information Of Poly Aluminum Chloride In Water Treatment Industry (2)
- Jun 19, 2018 -

Superiority of Poly Aluminum Chloride, PAC


     PAC polyaluminum chloridehas the advantages of good spray drying stability, wide water adaptability, fast hydrolysis speed, strong adsorption capacity, large alum flower formation, quick dense precipitation, low turbidity of effluent, good dehydration performance and so on. The amount of polyaluminium chloride added in spray drying is reduced, especially when the water quality is not good, the amount of spray drying products can be reduced by half as compared with that of drum drying, which not only reduces the labor intensity of workers, but also reduces the labor intensity of the workers. What is more important is to reduce the userundefineds water production cost. In addition, spray-drying products can ensure safety, reduce water accidents, and is very safe and reliable for drinking water. Polyaluminium chloride, or Poly Aluminum chloride, or PAC, using the most advanced production process, the use of high efficiency of high-quality raw materials to polymerize. The production shall be carried out in accordance with the requirements of GB 15892-2009. Polyaluminium chloride is made by spray drying process. So it can also be called high efficiency spray drying of Poly Aluminium chloride.


Basic Information of Poly Aluminium Chloride,PAC


Poly aluminum Chloride, also known as water purifying agent or coagulant, it is a water-soluble inorganic polymer between ALCL3 and ALCL3. The chemical formula is [AL2OHHNCl6-nLm] where m indicates the degree of polymerization and the degree of neutrality of PAC products. The color is yellow or light yellow, dark brown, dark gray resin solid. The product has a strong bridging adsorption performance. During the hydrolysis process, there are physical and chemical processes such as condensation, adsorption and precipitation. The fundamental difference between Poly Aluminium chloride and traditional inorganic coagulant is that the traditional inorganic coagulant is low molecular crystalline salt, and the structure of Poly Aluminium chloride is composed of polycarboxyl complex with variable form, the flocculation and precipitation speed is fast, and the range of PH value is wide. It is not corrosive to pipeline equipment, and has obvious effect on purifying water. It can effectively support the color SSCODBOD, arsenic, mercury and other heavy metal ions in water. This product is widely used in the fields of drinking water, industrial water and sewage treatment.

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Synthetic Method of Poly Aluminium Chloride,PAC

 

There are many methods for the synthesis of Poly Aluminium chloride. According to the difference of raw materials, it can be divided into metal aluminum method, active aluminum hydroxide method, aluminum trioxide method, aluminum chloride method, alkali solution method and so on. The main raw materials for the synthesis of Poly Aluminium chloride by metal aluminum method are aluminum scrap, aluminum ash and aluminum slag. The liquid Poly Aluminium chloride was prepared by slowly adding hydrochloric acid into aluminum ash at a certain proportion under stirring, and then the liquid Poly Aluminium chloride was prepared by aging polymerization, sedimentation, dilution, filtration, concentration and drying. The process can be divided into acid method, alkali method and neutralization method. The acid process mainly uses HCl, the product quality is not easy to control, the production process of alkali process is more difficult, the equipment investment is large, and the cost of raw materials is high with large amount of alkali and pH value, and the neutralization method is used most frequently, as long as the proportion is well controlled, Generally can reach the national standard. 2 aluminum hydroxide method. Aluminum hydroxide powder is of high purity and low content of toxic substances such as Poly Aluminium chloride, which is usually produced by heating pressurized acid solution. This process is relatively simple, but the base of Poly Aluminium chloride produced is low, so it is generally used to add calcium aluminate ore powder and acid solution of aluminium hydroxide under pressure. The main raw materials containing aluminum trioxide are bauxite, aluminovanite, kaolin, gangue and so on. The process can be divided into two steps: the first step is to obtain crystalline aluminum chloride and the second step is to obtain Poly Aluminium chloride by pyrolysis or neutralization. Aluminum chloride powder was used as raw material to process poly aluminium chloride. This method is most widely used. Crystallization aluminum chloride can be boiled pyrolyzed at 170 ℃, polymerized with water, then cured and dried to obtain 0.5 alkali solution. Sodium aluminate solution was prepared by reaction of aluminum ash with sodium hydroxide, and then pH value was adjusted with hydrochloric acid to prepare poly aluminium chloride solution. The product made by this method has better color appearance and less insoluble substance, but the content of sodium chloride is high, the consumption of raw material is high, the content of alumina in solution is low, and the cost of industrial production is high.

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