Sodium aluminate solution crystallization reaction device and use method thereof

Abstract

The invention relates to a chemical decomposition crystallization reaction device and particularly relates to a sodium aluminate solution crystallization reaction device and a use method thereof. The sodium aluminate solution crystallization reaction device comprises a reaction bucket, wherein an opening is formed in the center of the bucket bottom of the reaction bucket, a rotating shaft is arranged in the opening, a rotary disc is arranged on the rotating shaft in the reaction kettle, a plurality of stirring blades are uniformly arranged on the outer edge of the rotating disc, two support rods are fixedly arranged on the inner wall of the reaction bucket above the rotary disc, a slide plate is arranged between the two support rods, and a fixed rod is arranged in the center of the lower end surface of the slide plate; a lower baffle rod eccentrically arranged in the upper end surface of the rotary disc is in sliding fit with a third chute in the fixed rod, and a waveform second chute is formed in the upper end surface of the slide plate; and slide rods are arranged on two fixed plates, and upper baffle rods matched with the second chute are arranged in the centers of the lower end surfaces of the slide rods. The sodium aluminate solution crystallization reaction device has the beneficial effects that a produced product is relatively large in particle size, the manufacturing cost of equipment is low, and the power consumption is low; and the sodium aluminate solution crystallization reaction device is ideal equipment for producing aluminum oxide.

Description

technical field [0001] The invention relates to a chemical decomposition and crystallization reaction device, in particular to a sodium aluminate solution crystallization reaction device and a use method thereof. Background technique [0002] In the industrial production of alumina, seed decomposition is one of the important processes. At present, most of the reaction devices for producing aluminum hydroxide by supersaturated sodium aluminate solution plus seed crystal crystallization adopt large-scale flat-bottomed straight barrel cylindrical structure decomposition tanks; in order to prevent the aluminum hydroxide crystals produced by the crystallization reaction from settling and accumulating at the bottom of the decomposition tank , Hydrolysis and agglomeration to block continuous production, usually a mechanical stirring device with multi-layer paddles should be erected in the decomposition tank to stir continuously. Although this strong stirring can prevent the precip...

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Problems solved by technology

Although this strong stirring can prevent the precipitation of crystals, the shear force generated in the flow field of sodium aluminate solution will destroy the growth process of aluminum hydroxide crystals on the one hand, causing the crystals to be refined again, resulting in the final product ( The particle size of aluminum oxide) is mostly between sandy and powdery, which cannot meet the international standard requirements of sandy alumina products; leading to a decline in product grade

In addition, because the decomposition tank is huge, the mechanical stirring device is tens of meters long, and the stirring load is relatively large, not only the manufacturing requirements for the stirring shaft, stirring blades and other components of the stirrer are high, but also the energy consumption is relatively large

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