CN106185991A - Solar thermal energy is utilized to extract the apparatus and method of high purity potassium chloride from salt - Google Patents
Solar thermal energy is utilized to extract the apparatus and method of high purity potassium chloride from salt Download PDFInfo
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- CN106185991A CN106185991A CN201610552310.3A CN201610552310A CN106185991A CN 106185991 A CN106185991 A CN 106185991A CN 201610552310 A CN201610552310 A CN 201610552310A CN 106185991 A CN106185991 A CN 106185991A
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- salt
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- potassium chloride
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- 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
- C01D3/06—Preparation by working up brines; seawater or spent lyes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S21/00—Solar heat collectors not provided for in groups F24S10/00-F24S20/00
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention provides a kind of apparatus and method utilizing solar thermal energy to extract high purity potassium chloride from salt.Described device includes a salt gradient solar pond and a crystallizing pond, and the heat exchanger tube of the circulation that communicates with each other is laid in the bottom of two cell body；Storage tank and pipeline pump are installed in the middle part of heat exchanger tube；Crystallizing pond is arranged over heat-preserving cover plate.Its workflow includes perfusion salt in crystallizing pond, starts the water persistent loop in pipeline pump drives heat exchanger tube when solar pond bottom water temperature rise is to 50 60 DEG C, and the water temperature controlled in crystallizing pond is 40 50 DEG C, the Na of salt in monitoring crystallizing pond+:K+Mass ratio is to cover heat-preserving cover plate during 1:1.33 1.66, controls brine temperature and is down to 15 25 DEG C, discharges salt in crystallizing pond the crystal salt at the bottom of collecting pit after be aged 6 24 hours, then sprays through fresh water, obtains high purity potassium chloride after dehydrate.The method have the characteristics that the salt manufacturing mode that have employed alternating temperature crystallization, apparatus structure is simple, process is efficient, it is easy to operates and uses.
Description
Technical field
The present invention relates to the production technology of high purity potassium chloride, particularly belong to one and utilize solar thermal energy to extract height from salt
The apparatus and method of pure potassium chloride.
Background technology
In the Technology of present stage salt lake Chemical Manufacture, the main product extracted from salt lake bittern is mainly
The inorganic salts such as potassium chloride, sodium chloride, potassium sulfate, wherein potassium chloride is one of important product.But in current production
In technique, the purity of potassium chloride primary product typically just 85-95%, therefore it is used as agricultural potash fertilizer more.When will relatively low-purity
Potassium chloride when purifying as high-purity potassium chloride, need to use recrystallization device and technology to carry out refinement treatment, increase comparatively speaking
Having added complexity and the equipment investment of technological process, the heat energy required for recrystallization process also increases full-range energy consumption.
It addition, the potassium chloride of present stage is mainly prepared by method for floating, being affected by residual floating agent, this potassium chloride is in system
Certain technical difficulty is there is during standby high purity potassium chloride.
In a word, the KCl production of present stage have that a certain degree of primary product purity is relatively low, purification techniques difficulty big,
The problem that subtractive process energy consumption is high.When the high purity potassium chloride of the preparation product of purity >=98%, even purity >=99.5% produces
During product, it is necessary to take into account innovate technically and improve.According to these states of the art, it may be considered that use solar energy source from
Salt lake bittern extracting directly high purity potassium chloride, omits flotation and recrystallizing and refining process, Simplified flowsheet, reduction energy consumption.
Summary of the invention
It is an object of the invention to provide a kind of device utilizing solar thermal energy to extract high purity potassium chloride from salt and side
Method, can extracting directly is high-purity from salt potassium chloride, and omit flotation and recrystallization link.
The present invention is achieved through the following technical solutions.
A kind of device utilizing solar thermal energy to extract high purity potassium chloride from salt that the present invention provides, this device includes one
Individual salt gradient solar pond and a crystallizing pond, the heat exchanger tube communicating with each other and constituting loop is laid in the bottom of two cell body；Heat exchange
One pipeline pump and a storage tank are installed in the middle part of pipe；Crystallizing pond is provided above can the heat-preserving cover plate of folding.
The above-mentioned device utilizing solar thermal energy to extract high purity potassium chloride from salt, the volume of its solar pond is crystallizing pond
More than 10 times.
The above-mentioned device utilizing solar thermal energy to extract high purity potassium chloride from salt, its heat-preserving cover plate is the thin of metal material
Plate.
A kind of method utilizing solar thermal energy to extract high purity potassium chloride from salt that the present invention provides, uses above-mentioned dress
Put, comprise the steps:
A) in crystallizing pond 4, salt is irrigated；
B) in storage tank 6, irrigate fresh water, and make fresh water be full of heat exchanger tube 2；
C) when solar pond 1 bottom water temperature rise is to 50-60 DEG C, the water persistent loop in pipeline pump 3 drives heat exchanger tube 2 is started
Flowing；
D) heat of solar pond 1 bottom water is delivered in the salt of crystallizing pond 4 by the current in heat exchanger tube 2, makes crystallizing pond 4
In water temperature maintain 40-50 DEG C, the heat-preserving cover plate 5 above crystallizing pond 4 opens so that bittern evaporation；
E) monitor and analyze the Na of salt in crystallizing pond 4+And K+Content, as Na in salt+:K+Mass ratio reach 1:
1.33-1.66 time close heat-preserving cover plate 5 to stop bittern evaporation；
F) closing the pipeline pump 3 flowing with the water in stopping heat exchanger tube 2, the salt in crystallizing pond 4 starts radiating and cooling；
G) after the brine temperature in crystallizing pond 4 is down between 15-30 DEG C, continuing still aging 6-24 hour, period is such as
Pipeline pump 3 is then started so that making the brine temperature in crystallizing pond 4 maintain by heat transmission when water temperature is down to less than 15 DEG C
Between 15-30 DEG C；
H) after still aging, discharging salt in crystallizing pond 4, crystallizing pond 4 bottom deposit has crystal salt, will be equivalent to salt
The fresh water of initial volume 0.8-1.1% sprays on crystal salt surface equably, continues to stand 1-3 hour；
I) crystal salt bottom crystallizing pond 4 is collected, through centrifuge dehydration with obtain high purity potassium chloride after drying.
Above-mentioned steps a) injects the salt of crystallizing pond 4 and should be Na+,K+,Mg2+//Cl-,SO4 2--H2O salt-water system type salt,
And it is in K+Saturated but Mg2+Undersaturated state, SO in salt4 2-Mass content less than 2%.
Apparatus of the present invention simple in construction, process is easily operated, employs solar thermal energy as the energy, rises aborning
Arrive energy-saving and cost-reducing effect；The added value of production process can be improve from salt lake bittern extracting directly high purity potassium chloride；Save
Slightly the flotation in conventional art or recrystallizing and refining link, simplify technological process.It addition, method of the present invention is too
It is applicable to Mg2+Saturated but K+Undersaturated Na+,K+,Mg2+//Cl-,SO4 2--H2O salt-water system type salt, as SO in salt4 2-'s
The product obtained when mass content is less than 2% is high-purity magnesium chloride hexahydrate, works as SO4 2-Mass content higher than 2% time can obtain
Magnesium chloride hexahydrate and Magnesium sulfate heptahydrate product.To sum up, present configuration and flow process simple, can high-purity chlorine of output high added value
Change potassium product, and power savings advantages is obvious, practical.
Accompanying drawing explanation
Fig. 1 present invention utilizes solar thermal energy to extract the device schematic diagram of high purity potassium chloride from salt.
In figure: 1-solar pond；2-heat exchanger tube；3-pipeline pump；4-crystallizing pond；5-heat-preserving cover plate；6-storage tank.
Detailed description of the invention
Further illustrate the present invention below in conjunction with the accompanying drawings and by specific embodiment.
Salt in following example takes from area, Qaidam, Qinghai Province.
Embodiment 1:
The solar thermal energy that utilizes as shown in Figure 1 extracts the device of high purity potassium chloride from salt, including a salt gradient too
Sun pond 1 and a crystallizing pond 4, the heat exchanger tube 2 communicating with each other and constituting loop is laid in the bottom of two cell body；In the middle part of heat exchanger tube 2
One pipeline pump 3 and a storage tank 6 are installed；Crystallizing pond 4 is provided above can the heat-preserving cover plate 5 of folding；The volume of solar pond 1 is
55m3, the volume of crystallizing pond 4 is 5m3；Heat-preserving cover plate 5 above crystallizing pond 4 is ferrous material, wall thickness 0.8mm.
The method utilizing solar thermal energy to extract high purity potassium chloride from salt, comprises the steps:
A) in crystallizing pond 4, salt is irrigated；Salt is Na+,K+,Mg2+//Cl-,SO4 2--H2O salt-water system type salt, and
And its mass percent composition include NaCl be 10.60%, KCl be 10.44%, MgCl2Be 10.21%, MgSO4Be 0.30%,
H2O is 68.45%, is in K+Saturated but Mg2+Undersaturated state, SO in salt4 2-Mass content is the equal of 0.24%；
B) in storage tank 6, irrigate fresh water, and make fresh water be full of heat exchanger tube 2；
C) when solar pond 1 bottom water temperature rise is to 60 DEG C, the water persistent loop stream in pipeline pump 3 drives heat exchanger tube 2 is started
Dynamic；
D) heat of solar pond 1 bottom water is delivered in the salt of crystallizing pond 4 by the current in heat exchanger tube 2, makes crystallizing pond 4
In water temperature maintain 50 DEG C, the heat-preserving cover plate 5 above crystallizing pond 4 opens so that bittern evaporation；
E) monitor and analyze the Na of salt in crystallizing pond 4+And K+Content, as Na in salt+:K+Mass ratio reach 1:
Close heat-preserving cover plate 5 to stop bittern evaporation when 1.33；
F) closing the pipeline pump 3 flowing with the water in stopping heat exchanger tube 2, the salt in crystallizing pond 4 starts radiating and cooling；
G) after the brine temperature in crystallizing pond 4 is down to 25 DEG C, continuing still aging 6 hours, period is down to such as water temperature
Pipeline pump 3 is then started so that making the brine temperature in crystallizing pond 4 go back up to 25 DEG C by heat transmission when less than 15 DEG C；
H) after still aging, discharging salt in crystallizing pond 4, crystallizing pond 4 bottom deposit has crystal salt, will be equivalent to salt
The fresh water of initial volume 0.8% sprays on crystal salt surface equably, continues to stand 1 hour；
I) collecting the crystal salt bottom crystallizing pond 4, through centrifuge dehydration with obtain high purity potassium chloride after drying, quality is
140kg, purity has reached 99.9%.
Embodiment 2
Device and workflow are same as in Example 1, and difference is that step a) injects the brine quality hundred of crystallizing pond 4
Proportion by subtraction composition include NaCl be 10.10%, KCl be 9.94%, MgCl2Be 11.01%, MgSO4Be 0, H2O is 68.95%；Institute
The potassium chloride crystal salt obtained quality after dehydrate is 120kg, and purity has reached 99.9%.
Embodiment 3
Workflow is same as in Example 1, and difference is when in step c), solar pond 1 bottom water temperature rise is to 50 DEG C
Just start pipeline pump 3, and the water temperature in step d) makes crystallizing pond 4 maintains 40 DEG C；Obtained potassium chloride crystal salt warp
Crossing the quality after dehydrate is 35kg, and purity has reached 99.9%.
Claims (5)
1. one kind utilizes the device that solar thermal energy extracts high purity potassium chloride from salt, it is characterised in that include a salt gradient too
Yang Chi (1) and a crystallizing pond (4), the heat exchanger tube (2) communicating with each other and constituting loop is laid in the bottom of two cell body；Heat exchanger tube
(2) a pipeline pump (3) and a storage tank (6) are installed in middle part；Crystallizing pond (4) is provided above can the heat-preserving cover plate (5) of folding.
Solar thermal energy is utilized to extract the device of high purity potassium chloride from salt the most as claimed in claim 1, it is characterised in that too
The volume of Yang Chi (1) is more than 10 times of crystallizing pond (4).
Solar thermal energy is utilized to extract the device of high purity potassium chloride from salt the most as claimed in claim 1, it is characterised in that to protect
Temperature cover plate (5) is the thin plate of metal material.
4. one kind utilizes the method that solar thermal energy extracts high purity potassium chloride from salt, it is characterised in that use such as claim 1
Described device, comprises the steps:
A) perfusion salt in crystallizing pond (4)；
B) perfusion fresh water in storage tank (6), and make fresh water be full of heat exchanger tube (2)；
C) when solar pond (1) bottom water temperature rise is to 50-60 DEG C, the water started in pipeline pump (3) driving heat exchanger tube (2) persistently follows
Circulation moves；
D) heat of solar pond (1) bottom water is delivered in the salt of crystallizing pond (4) by the current in heat exchanger tube (2), makes crystallization
Water temperature in pond (4) maintains 40-50 DEG C, and the heat-preserving cover plate (5) of crystallizing pond (4) top is opened so that bittern evaporation；
E) monitor and analyze the Na of crystallizing pond (4) interior salt+And K+Content, as Na in salt+:K+Mass ratio reach 1:1.33-
Close heat-preserving cover plate (5) to stop bittern evaporation when 1.66；
F) closedown pipeline pump (3) is to stop the flowing of the water in heat exchanger tube (2), and the salt in crystallizing pond (4) starts radiating and cooling；
G) after the brine temperature in crystallizing pond (4) is down between 15-30 DEG C, still aging 6-24 hour is continued, period such as water
Pipeline pump (3) is then started to make the brine temperature in crystallizing pond (4) maintain 15-by heat transmission when temperature drop is to less than 15 DEG C
Between 30 DEG C；
H) after still aging, discharging crystallizing pond (4) interior salt, crystallizing pond (4) bottom deposit has crystal salt, will be equivalent to salt
The fresh water of initial volume 0.8-1.1% sprays on crystal salt surface equably, continues to stand 1-3 hour；
I) crystal salt of crystallizing pond (4) bottom is collected, through centrifuge dehydration with obtain high purity potassium chloride after drying.
Utilize the method that solar thermal energy extracts high purity potassium chloride from salt the most as claimed in claim 4, it is characterised in that institute
The salt stating step a) injection crystallizing pond 4 is Na+,K+,Mg2+//Cl-,SO4 2--H2O salt-water system type salt, and it is in K+Full
With but Mg2+Undersaturated state, SO in salt4 2-Mass content less than 2%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610552310.3A CN106185991B (en) | 2016-07-13 | 2016-07-13 | The apparatus and method of high purity potassium chloride are extracted from bittern using solar thermal energy |
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| CN201610552310.3A CN106185991B (en) | 2016-07-13 | 2016-07-13 | The apparatus and method of high purity potassium chloride are extracted from bittern using solar thermal energy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109761247A (en) * | 2019-03-06 | 2019-05-17 | 中蓝长化工程科技有限公司 | A kind of isolated salt lake bittern evaporation tank and its operation mode selection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583454A (en) * | 2012-02-13 | 2012-07-18 | 中国地质科学院盐湖与热水资源研究发展中心 | Method for extracting lithium carbonate from carbonate brine |
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2016
- 2016-07-13 CN CN201610552310.3A patent/CN106185991B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583454A (en) * | 2012-02-13 | 2012-07-18 | 中国地质科学院盐湖与热水资源研究发展中心 | Method for extracting lithium carbonate from carbonate brine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109761247A (en) * | 2019-03-06 | 2019-05-17 | 中蓝长化工程科技有限公司 | A kind of isolated salt lake bittern evaporation tank and its operation mode selection method |
| CN109761247B (en) * | 2019-03-06 | 2021-05-07 | 中蓝长化工程科技有限公司 | Isolated salt lake brine evaporation tank and operation mode selection method thereof |
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| CN106185991B (en) | 2018-05-18 |
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Inventor after: Cheng Huaigang Inventor after: Zhao Jing Inventor after: Wang Xin Inventor after: Cheng Fangqin Inventor after: Cheng Wenting Inventor before: Cheng Huaigang Inventor before: Wang Xin Inventor before: Zhao Jing Inventor before: Cheng Fangqin Inventor before: Cheng Wenting |
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