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High-salinity wastewater evaporative crystallization system and method thereof

A technology for evaporative crystallization and high-salt wastewater, which is applied in the directions of evaporative separation and crystallization, crystallization separation, and solution crystallization, which can solve the problem of low comprehensive income of crystalline salt, inability to guarantee the purity of crystalline salt, and inability to accurately control the transfer point of mother liquor and crystalline salt material Level and other issues, to reduce investment and treatment costs, to ensure the rate of crystallization of salt resources, saving the effect of melting crystallization system

Pending Publication Date: 2021-10-26
INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system is a typical thermal salt separation process. The disadvantage of this process is that it is impossible to accurately control the transfer point of the mother liquor and the material level of the crystallized salt. A large amount of mother liquor circulation cannot guarantee the purity of the crystallized salt, and the comprehensive income of the produced crystallized salt is low.

Method used

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  • High-salinity wastewater evaporative crystallization system and method thereof
  • High-salinity wastewater evaporative crystallization system and method thereof
  • High-salinity wastewater evaporative crystallization system and method thereof

Examples

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Effect test

Embodiment 1

[0039] Embodiment 1: as figure 1 As shown, a high-salt wastewater evaporation crystallization system includes a sodium sulfate crystallization unit 1, a first sodium chloride crystallization unit 2, a second sodium chloride crystallization unit 3 and a miscellaneous salt crystallization unit 4,

[0040] Sodium sulfate crystallization unit 1 comprises sodium sulfate evaporative crystallizer 11, the first thickener 12, the first centrifuge 13, freezing crystallizer 14, the second thickener 15 and the second centrifuge 16, nanofiltration concentrated water is sent into Sodium sulfate evaporation crystallizer 11, the discharge port of sodium sulfate evaporation crystallizer 11 is communicated with the inlet pipeline of the first thickener 12, and the outlet of the first thickener 12 is communicated with the inlet pipeline of the first centrifuge 13, The outlet of the first centrifuge 13 is the first sodium sulfate outlet, and the liquid outlet of the first centrifuge 13 is communi...

Embodiment 2

[0065] Embodiment 2: its overall structure is identical with embodiment 1, and difference is, as image 3 As shown, it also includes a melting crystallization unit 5, and the melting crystallization unit 5 includes a second dissolution tank 51, a melting crystallizer 52, the sixth thickener 53 and the sixth centrifuge 54, and the outlet of the second centrifuge 16 is connected to The inlet pipeline of the second dissolving tank 51 is communicated, and the outlet of the second dissolving tank 51 is communicated with the inlet pipeline of melting crystallizer 52, and the outlet of melting crystallizer 52 is communicated with the inlet pipeline of the sixth thickener 53, and the sixth The outlet of the thickener 53 is communicated with the inlet pipeline of the sixth centrifuge 54, and the discharge port of the sixth centrifuge 54 is the second sodium sulfate outlet, and the liquid outlet of the sixth centrifuge 54 is connected with the miscellaneous salt evaporation crystallizer ...

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Abstract

The invention discloses a high-salinity wastewater evaporative crystallization system which comprises a sodium sulfate crystallization unit, a first sodium chloride crystallization unit, a second sodium chloride crystallization unit and a carnallite crystallization unit. The high-salinity wastewater evaporative crystallization method comprises the following steps of (1) first sodium sulfate evaporative crystallization and freezing crystallization, (2) first sodium chloride evaporative crystallization, (3) second sodium chloride evaporative crystallization, and (4) carnallite evaporative crystallization. The method has the advantages that sodium chloride is subjected to two-stage salt production, and sodium chloride with different purities is produced; 2, sodium sulfate is subjected to evaporative crystallization and freezing crystallization in sequence, so that freezing crystallization blockage caused by direct freezing crystallization of a high sulfate radical solution can be avoided, most of sodium sulfate can be separated out, and the yield of sodium sulfate is increased; and 3, mirabilite produced by freezing crystallization can be conveyed to sodium sulfate evaporative crystallization and can also be directly conveyed to a sodium sulfate evaporative crystallization thickener, so that the investment and treatment cost are reduced.

Description

Technical field: [0001] The invention relates to the technical field of high-salt wastewater treatment, in particular to a high-salt wastewater evaporation crystallization system and a method thereof. Background technique: [0002] Many industries such as chemical industry, coal chemical industry, iron and steel, electronics, and pharmaceuticals will produce a large amount of high-salt wastewater mainly composed of sodium chloride and sodium sulfate. With strict environmental protection policies, these wastewaters need to be treated according to zero discharge . [0003] At present, the main process route of zero discharge of wastewater in the wastewater treatment industry is "pretreatment + membrane separation concentration + evaporation / freeze crystallization". Pretreatment reduces calcium and magnesium, silica, suspended solids, alkalinity, COD, etc. in wastewater, and then It is sent to the membrane separation and concentration system to be divided into nanofiltration c...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/38B01D9/02C01D3/24C01D5/00C01D5/16
CPCC02F1/048C02F1/043C02F1/38B01D9/0018B01D9/0063C01D5/16C01D5/004C01D3/24C01D3/06B01D2009/0086C01P2006/80
Inventor 余占军党平赛世杰张娜李买军张佳
Owner INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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