Secondary crystallizing system

Abstract

The invention discloses a secondary crystallizing system. According to a flowing direction of raw material solutions, the secondary crystallizing system sequentially comprises a concentrated crystal barrel, a middle barrel and a cooling crystal barrel, wherein the concentrated crystal barrel is used for containing the raw material solutions to be crystallized; the middle barrel is communicated with the concentrated crystal barrel by a pipeline, and is used for containing concentrated mother solutions which are obtained by carrying out primary crystallization nf the raw material solutions and flow into the middle barrel from the concentrated crystal barrel; the cooling crystal barrel is communicated with the middle barrel by the pipeline, and is used for cooling the concentrated mother solutions which flow out of the middle barrel. By adopting a device, crystallized products, i.e., zinc sulfate monohydrate and zinc sulfate heptahydrate, obtained by adopting two different crystallizing ways can be obtained once, and therefore, the device is convenient and quick to use, and is suitable for market promotion; moreover, with arrangement of a crystal clearing device, impurities adhered to the crystals on the barrel walls of the concentrated crystal barrel and the cooling crystal barrel are treated, so that an adverse effect on a subsequent crystallization process is avoided.

Description

technical field [0001] The invention relates to the field of crystallization, in particular to a secondary crystallization system. Background technique [0002] In the field of concentration and crystallization of zinc sulfate industry, the traditional process is to heat and concentrate to a certain concentration, heat crystallization at a certain temperature to produce zinc sulfate monohydrate, and then cool and crystallize the mother liquor of concentrated crystallization to separate zinc sulfate monohydrate to obtain zinc sulfate heptahydrate. However, due to the pre-precipitation process of zinc sulfate monohydrate, the mother liquor contains a large amount of zinc sulfate, the solution is easy to block the pipeline, and the cleaning is time-consuming and laborious, resulting in a substantial increase in production costs. Contents of the invention [0003] It is an object of the present invention to solve at least the above-mentioned problems and to provide at least th...

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Problems solved by technology

[0002] In the field of concentration and crystallization of zinc sulfate industry, the traditional process is to heat and concentrate to a certain concentration, heat crystallization at a certain temperature to produce zinc sulfate monohydrate, and then cool and crystallize the mother liquor of concentrated crystallization to separate zinc sulfate monohydrate to obtain zinc sulfate heptahydrate. However, due to the pre-precipitation process of zinc sulfate monohydrate, the mother liquor contains a large amount of zinc sulfate, the solution is easy to block the pipeline, and the cleaning is time-consuming and laborious, resulting in a substantial increase in production costs

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