Method for preparing polymeric aluminum chloride by using kaolinite ore

Abstract

A method to prepare polyaluminiumchloride from kaolinite ore comprises the steps that: kaolinite ore and lime, or kaolinite ore, lime and gypsum are respectively smashed, and ground to as fine as lower than 200 meshes; a storage tank of the materials is added with water, the ratio between the total weight of solid materials and water is 1: 1 to 3, then all powder materials are put into the storage tank with a proportion of kaolinite : lime 1.0 : 0.3 to 1.0, or kaolinite : lime : gypsum 1 : 0.3 to 1.0 : 0.03 to 0.10, and stirred and mixed. The well mixed materials are transferred into a high pressure reaction vessel, filled with high pressure steam, a hydrothermal reaction is taken placed at a temperature ranging from 130 DEG C to 250 DEG C, and the system is kept at the constant temperature for 5 to 24 hours. After the hydrothermal reaction, the reaction products are taken out to obtain primary products consisting essentially of hydrocalcium-aluminosilicate; the primary products further reacts with hydrochloride acid solution, and is filtered to eliminate residue, the obtained filtered liquid is evaporated, condensed and crystallized, finally the polyaluminiumchloride is prepared.The method not only has low energy consumption, but also cuts down the production cost.

Description

technical field [0001] The invention belongs to the field of polyaluminum chloride production, and in particular relates to a method for producing polyaluminum chloride by utilizing kaolinite ore. Background technique [0002] Polyaluminum chloride is a new type of inorganic polymer flocculant that was officially put into industrial production in the late 1960s. It is widely used in the purification of drinking water and industrial wastewater. With the development of industrial production and the improvement of environmental protection level, the demand is on the rise. At present, some manufacturers at home and abroad use aluminum scrap, aluminum ash, Al(OH) 3 , AlCl 3 For the production of aluminum-containing raw materials for polyaluminum chloride, due to high production costs and shortage of raw materials, it is difficult to achieve large-scale production. In recent years, in order to reduce production costs, many scientific research institutes, colleges and water puri...

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Problems solved by technology

At present, some manufacturers at home and abroad use aluminum scrap, aluminum ash, Al(OH) 3 , AlCl 3 For the production of aluminum-containing raw materials for polyaluminum chloride, due to high production costs and shortage of raw materials, it is difficult to achieve large-scale production