CN1178194A - Liquid phase one step crystallizing process for producing crystal sodium sulphate from nitrate containing brine - Google Patents
Liquid phase one step crystallizing process for producing crystal sodium sulphate from nitrate containing brine Download PDFInfo
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- CN1178194A CN1178194A CN97116654A CN97116654A CN1178194A CN 1178194 A CN1178194 A CN 1178194A CN 97116654 A CN97116654 A CN 97116654A CN 97116654 A CN97116654 A CN 97116654A CN 1178194 A CN1178194 A CN 1178194A
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- China
- Prior art keywords
- bittern
- crystallizing
- crystallization
- liquid phase
- nacl
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
Abstract
A liquid-phase one-step crystalline process for preparing crystallized sodium sulfate with nitre-containing bittern includes such technological steps as preparing bittern or mingling bittern, concentration, sunning on beach collecting crystallized bodies and removing impurities. By adding electrolyte to bittern from salt lake to lower crystalline temp and using solar and wind energy, anhydrous sodium sulfate crystal or decahydrated sodium sulfate can be prepared in summer (over 18 deg. C) or spring or winter (lower than 10 deg. C) with very low cost.
Description
The present invention relates to contain the utilization methods of caldo, refer in particular to a kind of liquid phase one step crystallizing that utilizes salt lake brine or intercrystalline bittern to make sodium sulfate crystal.
China is a continent country that the territory is wide, has many Na of containing
2SO
4, Na
2CO
3(NaHCO
3), the terrestrial facies lake of Nacl, be distributed widely in provinces such as the Inner Mongol, Shanxi, Xinjiang, Qinghai, Tibet, how to develop the valuable salt resource that contains in the terrestrial facies lake water, be the chemical field source of supplying raw materials, just become the research topic of vast chemist.
Utilize at present to contain the method two-step approach commonly used that the salt made from earth containing a comparatively high percentage of sodium chloride lake bittern water is made anhydrous sodium sulphate, the first step is to utilize winter-spring season weather cold, produces sal glauberi (Na with cold method
2SO
410H
2O).Second step was that sal glauberi is made anhydrous sodium sulphate by nature weathering method or thermosol method of evaporation.Wherein natural weathering method is that the ten water nitre that the first step makes are piled up, make its weathering dehydration under field conditions (factors), though this kind method productive expense is lower, but to produce life cycle of the product long in dehydration under the natural condition, poor product quality, and weathering pulverous anhydrous sodium sulphate of dewatering and making, be very easy to be blown away by wind, cause the significant wastage of raw material, not only influence the productive rate of anhydrous sodium sulphate, but also serious environment is polluted; If adopt the thermosol method of evaporation to make anhydrous sodium sulphate, then need more facility investment, and consume the more energy, cause cost higher.Therefore how to make full use of the natural resources, producing sodium sulfate crystal (comprising sal glauberi and anhydrous sodium sulphate) with lower cost just becomes problem extremely to be solved.
The inventor has carried out research and application test repeatedly through constantly studying and testing to rule and characteristics that the salt-water system liquid-solid phase transforms.
Starting point of the present invention is how to reduce the Tc of crystal anhydrous sour sodium and sal glauberi.From years of researches, find at simple Na
2SO
4-H
2In the O binary system, Na
2SO
4The crystallization minimum temperature be 32.4 ℃, this is in most of area, particularly northern area, because temperature is lower, if wanting to utilize natural condition directly to extract sodium sulfate crystal from the salt lake brine that contains nitre or intercrystalline bittern is to be difficult to realize, because improve large-area water temperature and be difficult to realize.But we obtain very ideal results from adding the research of electrolyte substance reduction Tc.
Fig. 1 is Na
2SO
4-Nacl-H
2O three no system phase diagrams, as can be seen from Figure 1:
1, pure Na
2SO
4Tc be 32.4 ℃ (M points among the figure);
2, the Tc of pure Nacl is-21.7 ℃ (N points among the figure);
3, Na
2SO10H
2The Tc of O is (a G point among the figure) below 10 ℃;
4, the adding of Nacl makes Na
2SO
4Tc descend: when Nacl content (dried salt composition) when being 48.9%, the temperature of separating out of anhydrous sodium sulphate drops to 25 ℃ (B points among the figure); The temperature of separating out of anhydrous sodium sulphate drops to 17.9 ℃ (A points among the figure) when the content of Nacl is increased to dried salt and forms 74.5%.
Reach a conclusion from Fig. 1: the existence of Nacl has remarkable effect to the temperature of separating out that reduces anhydrous sodium sulphate.
Fig. 2 is Na
2SO
4-Nacl-Na
2CO
3-H
2O four no system phase diagrams.As can be seen from Figure 2:
1, Na is being arranged
2CO
3When existing with Nacl, anhydrous sodium sulphate (Na
2SO
4) the temperature of separating out be 17.4 ℃ (E points among the figure), Na is described
2CO
3Existence can further reduce the temperature of separating out of anhydrous sodium sulphate when having only Nacl to exist.
2, Na is being arranged
2CO
3When existing with Nacl, ten water sodium sulphate Na
2SO
410H
2O separates out temperature at (F point among the figure) below 10 ℃.
The inventor creates utilization of the present invention and adds the technical scheme that ionogen reduces Tc according to above-mentioned research.
The objective of the invention is to utilize in containing salt made from earth containing a comparatively high percentage of sodium chloride lake bittern water or intercrystalline bittern, add sodium-chlor reduction sulfate crystal method of temperature, utilize cheap sun power and wind energy, make the method for crystal anhydrous sodium and sal glauberi with liquid phase one step crystallizing.
The object of the present invention is achieved like this: a kind of utilization contains the liquid phase one step crystallizing that caldo is made sodium sulfate crystal, it is characterized in that this crystallization process is included in to contain in the caldo adds ionogen Nacl and reduces the sulfate crystal method of temperature, be implemented in by sun power and wind energy and produce the anhydrous sodium sulphate crystallization when being higher than 18 ℃, produce the Sodium carbonate decahydrate crystallization when being lower than 10 ℃, the concrete step is poly-as follows:
(1) system halogen or convert halogen utilizes the fresh water dissolved salt to produce to contain caldo, salt lake brine or intercrystalline bittern and converts halogen, adds Nacl and makes bittern up to standard, makes in the system to reach:
Nacl 8-20% weight
Na
2SO
48-20% weight
[Na
2SO
4+ Nacl+Na
2CO
3]＞30% weight;
(2) make concentrated solution, bittern up to standard is introduced in the evaporation tank evaporated moisture content, make concentrated solution, making it reach proportion is 1.20～1.28;
(3) shine on the beach, the concentrated solution of step (two) is introduced the interior beach of crystallizing pond shone 8-15 days, and its bittern thickness is below 60cm;
(4) collect crystallization and removal of impurities, collect the anhydrous sodium sulphate crystallization when temperature is higher than 18 ℃, collect the sal glauberi crystallization when temperature is lower than 10 ℃, the residue mother liquor drains into the halogen storaging pool Recycling, and the sodium sulfate crystal of collection is piled the leaching removal of impurities that sticks together.
Shine at the bottom of the pond of crystallizing pond through compacting repeatedly, the rebasing or dead quarrel of system salt base plate on described beach.
Described collection crystalline method comprises mechanical harvesting.
The interior beach of described evaporation tank interior evaporation moisture content and crystallizing pond is shone the used energy and is comprised sun power and wind energy.
The described caldo that contains comprises and contains salt made from earth containing a comparatively high percentage of sodium chloride lake bittern water, seawater, intercrystalline bittern, fresh water dissolved salt system bittern.
Major advantage of the present invention is:
1, utilization of the present invention adds the method that ionogen Nacl reduces Tc in containing the salt made from earth containing a comparatively high percentage of sodium chloride lake bittern water, create the liquid phase one step crystallizing of making crystal anhydrous sodium and sal glauberi, realized producing when summer and autumn, temperature was high crystal anhydrous sodium, production crystallization sal glauberi when the spring winter temperature is low, the method that realization can both manufacture a finished product throughout the year, thereby create the effective way that development and use contain the salt made from earth containing a comparatively high percentage of sodium chloride lake bittern water, improve the utilization ratio of the facility of gathering.
2, the present invention utilizes cheap sun power and wind energy natural resources, greatly reduces manufacturing cost.
The present invention is further described below in conjunction with preferred embodiment and manufacturing process flow diagram:
Fig. 3 is a manufacturing process flow diagram of the present invention;
Consult Fig. 3, the present invention utilizes and adds ionogen Nacl, reduce the method for salt made from earth containing a comparatively high percentage of sodium chloride (anhydrous sodium sulphate crystallization and sal glauberi crystallization) Tc, the liquid phase one step crystallizing that utilizes cheap sun power and wind energy from contain caldo, to make sodium sulfate crystal, started the effective way of cheap manufacturing high-quality product, its concrete manufacturing process flow is:
(1) system halogen or convert halogen: system halogen and to convert halogen be key point of the present invention, because the content of Nacl size directly influences
Therefore the Tc of sodium sulfate and yield when the Halogen concentration in the salt lake saline is improper, need artificial system halogen,
Normally dissolve primary saltcake or get intercrystalline bittern and convert halogen, add again with the rainwater that compiles or lake table bittern
Nacl converts in the present embodiment after the halogen and reaches Nacl content 15% weight, Na in the system
2SO
4Content 15%
Weight; The solution proportion of converting after the halogen is 1.10～1.15.
(2) make concentrated solution: the above-mentioned bittern that will prepare is introduced evaporation tank, utilizes sun power and wind energy evaporation moisture content, system
Become concentrated solution, make its proportion reach 1.20-1.28.
(3) shine on the beach: rich liquor solution is introduced in the crystallizing pond, utilized sun power and wind energy beach to shine, bittern thickness in its crystallizing pond
40cm。Find in the experiment that of the present inventionly contain the effect that bittern water has suction, storage heat and conducts heat, it can be better
Ground absorbs sun power and is used for providing required heat when crystallization is separated out, thus save energy greatly, and reduction manufactures
This.
(4) collect crystallization and removal of impurities: because anhydrous sodium sulphate and sal glauberi be under different temperature condition, can be mutual
Transform, so the temperature condition when collecting crystallization is anhydrous sodium sulphate crystallization or ten with regard to the crystallization that becomes the decision collection
Aqueous sodium persulfate crystalline condition, generally the time greater than 18 ℃ temperature condition, the tying for anhydrous sodium sulphate of collection
Crystalline substance, less than 10 ℃ temperature condition the time, collection be the sal glauberi crystallization.Collecting crystallization at present often makes
Use mechanical harvesting, through piling the leaching that sticks together, dehalogenation reduces foreign matter content, makes the sodium sulfate crystal product, crystallizing pond
Interior residual halogen enters the halogen storaging pool Recycling.
The crystallizing pond seepage influence product yield when preventing that the beach is shone, at the bottom of the present invention takes repeatedly the compacting pond, the measures such as salt base plate that extremely are cut of rebasing or system.
Claims (5)
1, a kind of utilization contains the liquid phase one step crystallizing that caldo is made sodium sulfate crystal, it is characterized in that this crystallization process is included in to contain in the caldo adds ionogen Nacl and reduces the sulfate crystal method of temperature, be implemented in by sun power and wind energy and produce the anhydrous sodium sulphate crystallization when being higher than 18 ℃, produce the Sodium carbonate decahydrate crystallization when being lower than 10 ℃, the concrete step is poly-as follows:
(1) system halogen or convert halogen utilizes the fresh water dissolved salt to produce to contain caldo, salt lake brine or intercrystalline bittern and converts halogen, adds Nacl and makes bittern up to standard, makes in the system to reach:
Nacl 8-20% weight
Na
2SO
48-20% weight
[Na
2SO
4+ Nacl+Na
2CO
3]＞30% weight;
(2) make concentrated solution, bittern up to standard is introduced in the evaporation tank evaporated moisture content, make concentrated solution, making it reach proportion is 1.20～1.28;
(3) shine on the beach, the concentrated solution of step (two) is introduced the interior beach of crystallizing pond shone 8-15 days, and its bittern thickness is below 60cm;
(4) collect crystallization and removal of impurities, collect the anhydrous sodium sulphate crystallization when temperature is higher than 18 ℃, collect the sal glauberi crystallization when temperature is lower than 10 ℃, the residue mother liquor drains into the halogen storaging pool Recycling, and the sodium sulfate crystal of collection is piled the leaching removal of impurities that sticks together.
2, liquid phase one step crystallizing as claimed in claim 1 is characterized in that described beach shines at the bottom of the pond of crystallizing pond through compacting repeatedly, the rebasing or dead quarrel of system salt base plate.
3, liquid phase one step crystallizing as claimed in claim 1 is characterized in that described collection crystalline method comprises mechanical harvesting.
4, liquid phase one step crystallizing as claimed in claim 1 is characterized in that in the described evaporation tank that the used energy is shone on the beach in the evaporation moisture content and crystallizing pond and comprises sun power and wind energy.
5, liquid phase one step crystallizing as claimed in claim 1 is characterized in that the described caldo that contains comprises and contains salt made from earth containing a comparatively high percentage of sodium chloride lake bittern water, seawater, intercrystalline bittern, fresh water dissolved salt system bittern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116654A CN1061947C (en) | 1996-08-29 | 1997-08-06 | Liquid phase one step crystallizing process for producing crystal sodium sulphate from nitrate containing brine |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96109485.0 | 1996-08-29 | ||
| CN96109485 | 1996-08-29 | ||
| CN97116654A CN1061947C (en) | 1996-08-29 | 1997-08-06 | Liquid phase one step crystallizing process for producing crystal sodium sulphate from nitrate containing brine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1178194A true CN1178194A (en) | 1998-04-08 |
| CN1061947C CN1061947C (en) | 2001-02-14 |
Family
ID=25743986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116654A Expired - Fee Related CN1061947C (en) | 1996-08-29 | 1997-08-06 | Liquid phase one step crystallizing process for producing crystal sodium sulphate from nitrate containing brine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1061947C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439249C (en) * | 2006-10-25 | 2008-12-03 | 中国中轻国际工程有限公司 | Process for producing sodium sulfate and sodium chloride in Na2SO4-NaCl-H2O system |
| CN101928020A (en) * | 2010-05-21 | 2010-12-29 | 四川省川眉芒硝有限责任公司 | Continuous crystallization manufacturing process of medicinal glauber salt |
| CN102320630A (en) * | 2011-09-05 | 2012-01-18 | 湖南衡阳新澧化工有限公司 | Production method of anhydrous sodium sulfate and production equipment thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5673620A (en) * | 1979-11-19 | 1981-06-18 | Tokuyama Soda Co Ltd | Separation of sodium sulfate and sodium chloride from mixed solution of sodium chloride and sodium sulfate |
| CN1150120A (en) * | 1995-10-31 | 1997-05-21 | 邓天洲 | Process for producing alkali and potassium sulfate from bittern containing sulfate |
-
1997
- 1997-08-06 CN CN97116654A patent/CN1061947C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439249C (en) * | 2006-10-25 | 2008-12-03 | 中国中轻国际工程有限公司 | Process for producing sodium sulfate and sodium chloride in Na2SO4-NaCl-H2O system |
| CN101928020A (en) * | 2010-05-21 | 2010-12-29 | 四川省川眉芒硝有限责任公司 | Continuous crystallization manufacturing process of medicinal glauber salt |
| CN101928020B (en) * | 2010-05-21 | 2011-11-23 | 四川省川眉芒硝有限责任公司 | Continuous crystallization manufacturing process of medicinal glauber salt |
| CN102320630A (en) * | 2011-09-05 | 2012-01-18 | 湖南衡阳新澧化工有限公司 | Production method of anhydrous sodium sulfate and production equipment thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1061947C (en) | 2001-02-14 |
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