Salt separation evaporation crystallization and purification method

A technology of evaporative crystallization and purification method, which is applied in evaporative separation crystallization, chemical instruments and methods, crystallization separation, etc., and can solve problems such as salt pollution, water quality hazards, and failure to achieve zero discharge.

Inactive Publication Date: 2019-08-23
XINJIANG ENVIRONMENTAL ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If high-salt wastewater is discharged directly without desalination, it will cause great harm to the water quality of the receiving water body, and even cause secondary salinization
[0004] At present, most of the zero-discharge technologies for printing and dyeing wastewater tre

Method used

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  • Salt separation evaporation crystallization and purification method
  • Salt separation evaporation crystallization and purification method

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Experimental program
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Effect test

Embodiment 1

[0021] S1: Primary evaporation: change the salt content of high-salt wastewater from 0.8×10 5 mg / L concentrated to 3.2×10 5 mg / L, the temperature of one evaporation concentration is 50°C;

[0022] S2: Freeze crystallization: transport the concentrated wastewater obtained in S1 to the freeze crystallization device to precipitate Na 2 SO 4 10H 2 O crystal, realizing the separation of sodium sulfate and sodium chloride, the temperature of freezing and crystallization is 0°C;

[0023] S3: Evaporation and purification: the Na obtained by S2 2 SO 4 10H 2 O is purified by evaporation to produce sodium sulfate with a final purity of 99.3%;

[0024] S4: Secondary evaporation: The mother liquor obtained in S2 is evaporated and crystallized again to produce sodium chloride salt with a purity of 98.2%. The temperature of the second evaporation and crystallization is 80°C, and the remaining mother liquor after evaporation is returned to the primary evaporation water for recycling. ...

Embodiment 2

[0026] S1: Primary evaporation: change the salt content of high-salt wastewater from 1.2×10 5 mg / L concentrated to 2.8×10 5 mg / L, the temperature of one evaporation concentration is 100°C;

[0027] S2: Freeze crystallization: transport the concentrated wastewater obtained in S1 to the freeze crystallization device to precipitate Na 2 SO 4 10H 2 O crystal, realizing the separation of sodium sulfate and sodium chloride, the temperature of freezing and crystallization is 0°C;

[0028] S3: Evaporation and purification: the Na obtained by S2 2 SO 4 10H 2 O is purified by evaporation to produce sodium sulfate with a final purity of 99.5%;

[0029] S4: Secondary evaporation: The mother liquor obtained in S2 is evaporated and crystallized again to produce sodium chloride salt with a purity of 98.6%. The temperature of the second evaporation and crystallization is 100°C, and the remaining mother liquor after evaporation is returned to the primary evaporation water for recycling....

Embodiment 3

[0031] S1: Primary evaporation: change the salt content of high-salt wastewater from 1.0×10 5 mg / L concentrated to 3.0×10 5 mg / L, the temperature of one evaporation concentration is 80°C;

[0032] S2: Freeze crystallization: transport the concentrated wastewater obtained in S1 to the freeze crystallization device to precipitate Na 2 SO 4 10H 2 O crystal, realizing the separation of sodium sulfate and sodium chloride, the temperature of freezing and crystallization is 0°C;

[0033] S3: Evaporation and purification: the Na obtained by S2 2 SO 4 10H 2 O is purified by evaporation to produce sodium sulfate with a final purity of 99.3%;

[0034] S4: Secondary evaporation: The mother liquor obtained in S2 is evaporated and crystallized again to produce sodium chloride salt with a purity of 98.5%. The temperature of the second evaporation and crystallization is 90°C, and the remaining mother liquor after evaporation is returned to the primary evaporation water for recycling. ...

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Abstract

The invention discloses a salt separation evaporation crystallization and purification method, which comprises four steps of primary evaporation, freezing crystallization, evaporation purification andsecondary evaporation. The method realizes the salt separation of sodium sulfate and sodium chloride from printing and dyeing high-salt waste water, and ensures the purity of the sodium sulfate and the sodium chloride, wherein the purity of the sodium sulfate is more than or equal to 99%, the purity of the sodium chloride is more than or equal to 98%, and the produced salts can be reused in industrial production, finally no waste water and solid waste are discharged, and true zero emission is realized.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a method for salt separation, evaporation, crystallization and purification. Background technique [0002] In recent years, with the national promotion of zero-discharge technology, zero-discharge technology has been applied to various difficult wastewater treatment, especially printing and dyeing wastewater in the textile industry. [0003] Printing and dyeing wastewater has high salt content, and direct discharge is likely to cause ecological problems. A large number of auxiliaries used in the printing and dyeing production process, such as caustic soda, sodium sulfate, soda ash, sodium chloride and salt-containing dyes, will increase the salt content in wastewater. If high-salt wastewater is discharged directly without desalination, it will cause great harm to the water quality of the receiving water body, and even cause secondary salinization...

Claims

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Application Information

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IPC IPC(8): B01D9/02C01D3/24C01D3/04C01D5/16
CPCB01D9/0004B01D9/0031B01D2009/0086C01D3/04C01D3/24C01D5/16
Inventor 郭超艾山·玉素莆祖拜代·图尔荪麦麦提杨泰山
Owner XINJIANG ENVIRONMENTAL ENG TECH
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