Polyaluminum chloride
There are many kinds of synthetic methods of polyaluminum chloride, according to the different raw materials, can be divided into metal aluminum method, active aluminum hydroxide method, aluminum oxide method, aluminum chloride method, alkali dissolution method.
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There are many kinds of synthetic methods of polyaluminum chloride, according to the different raw materials, can be divided into metal aluminum method, active aluminum hydroxide method, aluminum oxide method, aluminum chloride method, alkali dissolution method.
① Metal aluminum method. The raw materials used to synthesize polyaluminum chloride by metal-aluminum process are mainly the leftovers of aluminum processing, such as aluminum scrap, aluminum ash and aluminum slag. Hydrochloric acid is slowly added to aluminum ash under stirring in a certain ratio to react, and liquid polyaluminum chloride is prepared by aging polymerization and sedimentation, and then diluted, filtered, concentrated and dried. In the process can be divided into acid method, alkali method, neutralization method 3. Acid method mainly uses HCl, the product quality is not easy to control; The alkaline production process is difficult, the equipment investment is large and the amount of alkali is large, the pH value control costs raw materials, and the cost is high. The most used is the neutralization method, as long as the ratio is controlled, it can generally meet the national standard.
② Aluminum hydroxide method. The purity of aluminum hydroxide powder is relatively high, the content of polyaluminum chloride heavy metals and other toxic substances is low, and the production process of heating and pressurizing acid dissolution is generally adopted. This process is relatively simple, but the production of polyaluminum chloride salt base is low, so the general use of aluminum hydroxide heating pressure acid dissolution coupled with calcium aluminate mineral powder neutralization two processes.
③ Trialumina method. The raw materials containing aluminum oxide are mainly diaspore, aluminum vanadite, kaolin, coal gangue and so on. The production process can be divided into two steps: the first step is to obtain crystalline aluminum chloride, and the second step is to obtain polyaluminum chloride by pyrolysis or neutralization.
④ aluminum chloride process. Polyaluminium chloride was processed by using aluminium chloride powder as raw material. This method is the most widely used. It can be obtained by boiling pyrolysis of crystalline aluminum chloride at 170℃, curing polymerization with water, and then curing and drying.
⑤ alkali solution method. Polyaluminum chloride solution was obtained by reacting aluminum ash with sodium hydroxide to obtain sodium aluminate solution, and then pH value was adjusted by hydrochloric acid. The product obtained by this method has better color and appearance, less insoluble matter, but high sodium chloride content, high raw material consumption, low solution alumina content, and large industrial production cost.
Keywords：
Aluminate cement, calcium aluminate powder, polyaluminium chloride
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