Test method of polyaluminum chloride

Test method for polyaluminum chloride

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There are two methods for preparing polyaluminum chloride: spray drying and drum drying. The neutralization method is to react caustic soda and hydrochloric acid with aluminum ash to produce sodium aluminate and aluminum trichloride, and then synthesize polyaluminum chloride in an appropriate ratio. The key to production is the ratio between sodium aluminate and aluminum trichloride solution [3]. The acid solution method is to directly produce liquid polyaluminum chloride by reacting aluminum ash and hydrochloric acid at one time. It has the characteristics of fast reaction speed and simple process. Lvjie Environmental Protection uses aluminum ash as the raw material to study the process of preparing polyaluminum chloride by the acid solution method, and obtains the appropriate process conditions for the preparation of polyaluminum chloride.

  Experimental part

　　 Main equipment: water bath, stirrer, vacuum pump, electric furnace, analytical balance, acidity meter and common laboratory instruments.

  experimental method

　　 First, the aluminum ash is pretreated. The water-soluble salt is removed by washing with water to reduce the consumption of hydrochloric acid. The aluminum ash after treatment contains about 30% of alumina. Then put the industrial hydrochloric acid and a certain amount of water into the reactor, stir, and heat with a water bath. Weigh 100 g of aluminum ash and gradually add it to the hydrochloric acid solution. Due to the violent reaction and large exothermic heat, it should be stirred continuously and water should be added at any time. The reaction time is controlled at 6 h to 12 h, the reaction temperature is 96 ℃, and a certain amount is added after the reaction. Dilute the material with a volume of water, adjust the pH to 3.5-4.5, and age for 15-24 h to obtain a liquid product.

　　The reaction of hydrochloric acid and aluminum ash is:

　　2Al + (6-n)HCl + nH20 = Al2(OH)nCl6-n + 3H2-

　　NAl + (6-n)AlCl3 + 3nH20 = 3A12(OH)nCl6-n + 1.5nH2

In the reaction, the dissolution of aluminum, the hydrolysis of the product, and the polymerization of the hydrolyzed product are interleaved. Preparation process of liquid polyaluminum chloride. To

Henan Longxin Environmental Protection Technology Co., Ltd. specializes in the production of various environmental protection materials such as basic aluminum chloride, polyaluminum chloride, activated carbon, fiber balls, fiber bundles, modified fiber balls, modified fiber bundles, molecular sieves, emery, etc., factory direct sales, Price concessions, welcome new and old customers to join hands and develop together.