Continuous circulation flow crystallizer

Abstract

The invention discloses a continuous circulation flow crystallizer which comprises a top heating chamber, a middle crystallization chamber, a bottom crystal collection chamber, a filtering separator and a mother liquid backflow tube, wherein a heat preservation jacket is arranged on the outer side of the top heating chamber; a cooling interlayer is arranged on the outer side of the bottom crystalcollection chamber; a Venturi feeding tube, a stirring device and a heating device are arranged on the top heating chamber; a gradient cooling device is arranged on the outer side of the middle crystallization chamber; the middle crystallization chamber is internally provided with a guide tube; a plurality of through holes are uniformly formed in the circular wall of the guide tube; a channel through which a fluid flows is formed between the side wall of the outer part of the guide tube and the side wall of the inner part of the middle crystallization chamber; a crystal liquid discharge tube is arranged at the bottom of the bottom crystal collection chamber; the bottom is connected with the filtering separator through the crystal liquid discharge tube; a crystal product is discharged froma solid outlet of the filtering separator; a liquid outlet of the filtering separator is divided into two paths; one path is used for discharging a mother liquid; and the other path communicates withthe opening in the lower end of the guide tube through the mother liquid backflow tube. The device disclosed by the invention particularly has a good crystallization treatment effect on a solid-liquidcrystallization system which is sensitive to temperatures and small in metastable zone

Description

technical field [0001] The present application relates to a circulating continuous crystallizer. Background technique [0002] In the process of producing aluminum sulfate octadecahydrate, the crystallization method is usually used to purify the product. Because the product contains water of crystallization, the crystallization process is sensitive to temperature and the metastable zone of crystallization is small. The traditional intermittent crystallization process takes a long time to operate, is prone to explosive nucleation, has low crystallization force, and low product quality. If the crystallization process can adopt a continuous crystallization method and the temperature of each part of the crystallization equipment can be controlled, the explosive crystallization of aluminum sulfate octadecahydrate can be avoided, and a product with controllable crystal size and good crystal quality can be obtained. At the same time, the continuous crystallization process can redu...

AI Technical Summary

Problems solved by technology

Because the product contains water of crystallization, the crystallization process is sensitive to temperature and the metastable zone of crystallization is small. The traditional batch crystallization process takes a long time to operate, prone to explosive nucleation, low crystallization force, and low product quality.

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