CN110152340A - One kind dividing salt evaporative crystallization and purification process - Google Patents
One kind dividing salt evaporative crystallization and purification process Download PDFInfo
- Publication number
- CN110152340A CN110152340A CN201810256858.2A CN201810256858A CN110152340A CN 110152340 A CN110152340 A CN 110152340A CN 201810256858 A CN201810256858 A CN 201810256858A CN 110152340 A CN110152340 A CN 110152340A
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- Prior art keywords
- salt
- purification process
- sodium chloride
- evaporative crystallization
- purity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
- B01D9/0031—Evaporation of components of the mixture to be separated by heating
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/22—Preparation in the form of granules, pieces, or other shaped products
- C01D3/24—Influencing the crystallisation process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D2009/0086—Processes or apparatus therefor
Abstract
The invention discloses one kind to divide salt evaporative crystallization and purification process, including flush distillation, freezing and crystallizing, four evaporation purification, double evaporation-cooling steps, the invention realizes printing and dyeing high-salt wastewater sodium sulphate and sodium chloride divides salt, and it ensure that the purity of sodium sulphate and sodium chloride, the salinity of sodium sulphate purity >=99%, sodium chloride purity >=98%, output can be back to use in industrial production, it is finally discharged without waste water and solid waste, realizes real zero-emission.
Description
Technical field
The present invention relates to techniques of Dyeing Wastewater Treatment field, especially one kind divides salt evaporative crystallization and purification process.
Background technique
In recent years, the popularization with country to zero-discharge technology, zero-discharge technology have application to various highly difficult waste water
Dyeing waste water in processing, especially in textile industry.
Dyeing waste water salt content is high, and direct emission is easy to bring ecological problem.It is largely helped used in printing and dyeing production process
Agent, such as caustic soda, anhydrous sodium sulphate, soda ash, sodium chloride and can improve containing salt dyestuff salt content in waste water.High-salt wastewater such as without
Desalination, direct emission will cause larger harm to the water quality of receiving water body, or even cause Secondary Saline.
It can only all accomplish the zero-emission of water for most of zero-discharge technologies for the treatment of of dyeing wastewater at present, in treatment process
The salinity of generation is because of its broad categories and contains heavy metal substance, can only do dangerous waste processing, and saline pollution problem still remains, and
It is not carried out real zero-emission.Therefore it how by the salt progress separating-purifying in high-salt wastewater in processing, is allowed to recycle,
It realizes real zero-emission, is the key that high-salinity wastewater zero-emission technology.
Summary of the invention
Technical problems based on background technology, the present invention propose that one kind divides salt evaporative crystallization and purification process, for
High saliferous printing and dyeing high-salt wastewater sodium sulphate and sodium chloride divide the technique of salt and purification, finally realize the zero-emission of high saliferous dyeing waste water
It puts.
One kind dividing salt evaporative crystallization and purification process, and method and step is as follows:
S1: flush distillation: by the salt content of high-salt wastewater by (0.8-1.2) × 105Mg/L be concentrated into (2.8-3.2) ×
105mg/L；
S2: freezing and crystallizing: the concentration waste water that S1 is obtained is delivered to freezing and crystallizing device, Na is precipitated2SO4·10H2O is brilliant
Body, realization sodium sulphate and sodium chloride divide salt；
S3: evaporation purification: the Na that S2 is obtained2SO4·10H2O is evaporated purification, final 99% or more the purity of output
Sodium sulfate salt；
S4: double evaporation-cooling: being evaporated crystallization for the mother liquor that S2 is obtained again, 98% or more sodium chloride salt of output purity,
The mother liquor of double evaporation-cooling returns to flush distillation circular treatment.
Preferably, the temperature that flush distillation is concentrated in the S1 is 50-100 DEG C.
Preferably, the temperature of freezing and crystallizing is 0 DEG C in the S2.
Preferably, the temperature that double evaporation-cooling crystallizes in the S4 is 80-100 DEG C.
Salt evaporative crystallization and purification process is divided to be applied to the sulfuric acid in separation printing and dyeing high-salt wastewater the present invention also provides a kind of
Sodium and sodium chloride.
It is in the present invention the utility model has the advantages that
The present invention proposes that one kind divides salt evaporative crystallization and purification process, the invention realize printing and dyeing high-salt wastewater sodium sulphate and
Sodium chloride divides salt, and ensure that the purity of sodium sulphate and sodium chloride, sodium sulphate purity >=99%, sodium chloride purity >=98%,
The salinity of output can be back to use in industrial production, be finally discharged without waste water and solid waste, realized real zero-emission.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is a kind of flow chart for dividing salt evaporative crystallization and purification process proposed by the present invention.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment 1
S1: flush distillation: by the salt content of high-salt wastewater by 0.8 × 105Mg/L is concentrated into 3.2 × 105Mg/L, it is primary to steam
The temperature of hair concentration is 50 DEG C；
S2: freezing and crystallizing: the concentration waste water that S1 is obtained is delivered to freezing and crystallizing device, Na is precipitated2SO4·10H2O is brilliant
Body, realization sodium sulphate and sodium chloride divide salt, and the temperature of freezing and crystallizing is 0 DEG C；
S3: evaporation purification: the Na that S2 is obtained2SO4·10H2O is evaporated purification, the sulphur of the final purity 99.3% of output
Acid sodium-salt；
S4: double evaporation-cooling: being evaporated crystallization for the mother liquor that S2 is obtained again, the sodium chloride salt of output purity 98.2%,
The temperature of double evaporation-cooling crystallization is 80 DEG C, and the mother liquor reflux of evaporation residue is intake to flush distillation, circular treatment.
Embodiment 2
S1: flush distillation: by the salt content of high-salt wastewater by 1.2 × 105Mg/L is concentrated into 2.8 × 105Mg/L, it is primary to steam
The temperature of hair concentration is 100 DEG C；
S2: freezing and crystallizing: the concentration waste water that S1 is obtained is delivered to freezing and crystallizing device, Na is precipitated2SO4·10H2O is brilliant
Body, realization sodium sulphate and sodium chloride divide salt, and the temperature of freezing and crystallizing is 0 DEG C；
S3: evaporation purification: the Na that S2 is obtained2SO4·10H2O is evaporated purification, the sulphur of the final purity 99.5% of output
Acid sodium-salt；
S4: double evaporation-cooling: being evaporated crystallization for the mother liquor that S2 is obtained again, the sodium chloride salt of output purity 98.6%,
The temperature of double evaporation-cooling crystallization is 100 DEG C, and the mother liquor reflux of evaporation residue is intake to flush distillation, circular treatment.
Embodiment 3
S1: flush distillation: by the salt content of high-salt wastewater by 1.0 × 105Mg/L is concentrated into 3.0 × 105Mg/L, it is primary to steam
The temperature of hair concentration is 80 DEG C；
S2: freezing and crystallizing: the concentration waste water that S1 is obtained is delivered to freezing and crystallizing device, Na is precipitated2SO4·10H2O is brilliant
Body, realization sodium sulphate and sodium chloride divide salt, and the temperature of freezing and crystallizing is 0 DEG C；
S3: evaporation purification: the Na that S2 is obtained2SO4·10H2O is evaporated purification, the sulphur of the final purity 99.3% of output
Acid sodium-salt；
S4: double evaporation-cooling: being evaporated crystallization for the mother liquor that S2 is obtained again, the sodium chloride salt of output purity 98.5%,
The temperature of double evaporation-cooling crystallization is 90 DEG C, and the mother liquor reflux of evaporation residue is intake to flush distillation, circular treatment.
Detection test
1) 100g sodium sulphate made from Example 3 produces salt and carries out content detection, the results are shown in Table 1.
1 sodium sulphate of table produces salt component
| Produce salt total amount | Sodium sulphate | Sodium chloride | Potassium chloride | Potassium sulfate | Other substances | Sodium sulphate purity |
| 100g | 99.58g | 0.37g | 0.025g | 0.012g | 0.013g | 99.58% |
2) 100g sodium chloride made from Example 3 produces salt and carries out content detection, the results are shown in Table 2.
2 sodium chloride of table produces salt component
| Produce salt total amount | Sodium sulphate | Sodium chloride | Potassium chloride | Potassium sulfate | Other substances | Sodium sulphate purity |
| 100g | 1.11g | 98.77g | 0.05g | 0.025g | 0.045g | 98.77% |
3) double evaporation-cooling mother liquor water quality is shown in Table 3 in embodiment 3.
The component of 3 double evaporation-cooling mother liquor of table
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. one kind divides salt evaporative crystallization and purification process, which is characterized in that method and step is as follows:
S1: flush distillation: by the salt content of high-salt wastewater by (0.8-1.2) × 105Mg/L is concentrated into (2.8-3.2) × 105mg/
L；
S2: freezing and crystallizing: the concentration waste water that S1 is obtained is delivered to freezing and crystallizing device, Na is precipitated2SO4·10H2O crystal, it is real
Existing sodium sulphate and sodium chloride divide salt；
S3: evaporation purification: the Na that S2 is obtained2SO4·10H2O is evaporated purification, the sulfuric acid of final 99% or more the purity of output
Sodium salt；
S4: double evaporation-cooling: the mother liquor that S2 is obtained is evaporated crystallization again, 98% or more sodium chloride salt of output purity is secondary
The mother liquor of evaporation returns to flush distillation circular treatment.
2. one kind according to claim 1 divides salt evaporative crystallization and purification process, which is characterized in that once steamed in the S1
The temperature of hair concentration is 50-100 DEG C.
3. one kind according to claim 1 divides salt evaporative crystallization and purification process, which is characterized in that freeze knot in the S2
Brilliant temperature is 0 DEG C.
4. one kind according to claim 1 divides salt evaporative crystallization and purification process, which is characterized in that secondary steaming in the S4
The temperature of hair crystallization is 80-100 DEG C.
5. the described in any item one kind of claim 1-4 divide salt evaporative crystallization and purification process to be applied to separation printing and dyeing high-salt wastewater
In sodium sulphate and sodium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810256858.2A CN110152340A (en) | 2018-03-27 | 2018-03-27 | One kind dividing salt evaporative crystallization and purification process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810256858.2A CN110152340A (en) | 2018-03-27 | 2018-03-27 | One kind dividing salt evaporative crystallization and purification process |
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| CN201810256858.2A Pending CN110152340A (en) | 2018-03-27 | 2018-03-27 | One kind dividing salt evaporative crystallization and purification process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704294A (en) * | 2020-06-04 | 2020-09-25 | 徐翔 | General recycling process for fine chemical wastewater |
| CN112707417A (en) * | 2021-01-14 | 2021-04-27 | 江苏赛德力制药机械制造有限公司 | Sodium sulfate and sodium chloride salt separation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452672A (en) * | 2010-11-01 | 2012-05-16 | 中国石油化工股份有限公司 | Method for recycling sodium sulfate from waste alkali liquor of ethylene unit |
| CN105036222A (en) * | 2015-08-19 | 2015-11-11 | 石家庄工大化工设备有限公司 | High-salinity wastewater recovery treatment method |
| CN106007133A (en) * | 2016-05-27 | 2016-10-12 | 苏州乔发环保科技股份有限公司 | Desulfurization wastewater concentration, evaporation, crystallization and salt separation process |
| CN106315991A (en) * | 2016-10-11 | 2017-01-11 | 内蒙古中煤远兴能源化工有限公司 | Industrial wastewater salt separation technology and industrialized application thereof |
| CN107619144A (en) * | 2017-10-20 | 2018-01-23 | 侯新春 | A kind of high slat-containing wastewater divides salt process for reclaiming and system |
-
2018
- 2018-03-27 CN CN201810256858.2A patent/CN110152340A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452672A (en) * | 2010-11-01 | 2012-05-16 | 中国石油化工股份有限公司 | Method for recycling sodium sulfate from waste alkali liquor of ethylene unit |
| CN105036222A (en) * | 2015-08-19 | 2015-11-11 | 石家庄工大化工设备有限公司 | High-salinity wastewater recovery treatment method |
| CN106007133A (en) * | 2016-05-27 | 2016-10-12 | 苏州乔发环保科技股份有限公司 | Desulfurization wastewater concentration, evaporation, crystallization and salt separation process |
| CN106315991A (en) * | 2016-10-11 | 2017-01-11 | 内蒙古中煤远兴能源化工有限公司 | Industrial wastewater salt separation technology and industrialized application thereof |
| CN107619144A (en) * | 2017-10-20 | 2018-01-23 | 侯新春 | A kind of high slat-containing wastewater divides salt process for reclaiming and system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704294A (en) * | 2020-06-04 | 2020-09-25 | 徐翔 | General recycling process for fine chemical wastewater |
| CN112707417A (en) * | 2021-01-14 | 2021-04-27 | 江苏赛德力制药机械制造有限公司 | Sodium sulfate and sodium chloride salt separation method |
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Address after: 1202, Dachong building, No. 2009, Shahe West Road, Dachong community, Yuehai street, Nanshan District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Delan ecological environment Co., Ltd. Address before: The 830001 the Xinjiang Uygur Autonomous Region Urumqi high tech Industrial Development Zone (new city) north Dongrong Street No. 567 building eleven floor, South Tower of high-tech talent Applicant before: Xinjiang Environmental Engineering Technology Co., Ltd. |
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