A kind of manufacturing equipment and manufacturing method of ultrafine aluminum hydroxide

Abstract

The invention discloses a preparation device and method for superfine aluminum hydroxide. The device comprises a reactor, a collecting device and an absorption device, wherein the reactor is communicated with an aluminum salt tank and a water storage tank, the reactor is internally provided with a turbine, the side of the top of the reactor is communicated with the collecting device, the collecting device comprises a cyclone dust collector, the top of the cyclone dust collector is provided with a dust collection cloth bag, the inner portion of the dust collection cloth bag is communicated withan induced draft fan through a pipeline, the induced draft fan is communicated with the absorption device, the aluminum salt tank and the water storage tank are provided with heating devices respectively, and the aluminum salt tank and the water storage tank are both communicated with the reactor through titanium tubes. The preparation method comprises the steps that aluminum chloride and water are evaporated into steam, then a gas-phase reaction is carried out in the reactor to obtain aluminum hydroxide, and the cyclone dust collector performs dust collection to obtain the superfine aluminumhydroxide. The preparation device and method for the superfine aluminum hydroxide have the advantages that the device is simple, the continuous synthesis can be achieved, the preparation method is simple, the cost is low, no wastewater is generated, and the obtained superfine aluminum hydroxide is narrow in size distribution, good in dispersity and high in purity.

Description

technical field [0001] The invention relates to a manufacturing equipment and method of superfine aluminum hydroxide, belonging to the technical field of powder preparation. Background technique [0002] Aluminum hydroxide (Aluminiumhydroxide), chemical formula Al(OH)3, is the hydroxide of aluminum. Because of its acidity, it can also be called monohydrated aluminum (HAlO2·H2O), but in the actual aqueous solution, when it reacts with alkali, it will produce tetrahydroxyaluminate Al(OH)4-, which can be divided according to the application. There are two kinds of industrial grade and pharmaceutical grade. [0003] Its industrial production comprises following two methods: 1. Bayer method, was invented in 1888 by Austria Bayer (K.J.Bayer). The principle is to use caustic soda (NaOH) solution to heat and dissolve alumina in bauxite to obtain sodium aluminate solution. After the solution is separated from the residue (red mud), lower the temperature, add aluminum hydroxide as ...

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Problems solved by technology

However, the preparation process requires high requirements, and because the particle size of the product increases after the seed is divided once, the decomposed aluminum hydroxide cannot be used as a seed crystal cycle, so each batch needs to prepare a seed crystal, which increases the cost.

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