CN110372010B - Method for drying salt in the sun by using porous ceramic plate - Google Patents
Method for drying salt in the sun by using porous ceramic plate Download PDFInfo
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- CN110372010B CN110372010B CN201910729191.8A CN201910729191A CN110372010B CN 110372010 B CN110372010 B CN 110372010B CN 201910729191 A CN201910729191 A CN 201910729191A CN 110372010 B CN110372010 B CN 110372010B
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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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- 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
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a method for drying salt in the sun by utilizing a porous ceramic plate, which specifically comprises the following steps: the porous ceramic plate after absorbing the seawater utilizes the action of sunlight and wind force to evaporate water in pores of the porous ceramic plate until salt is separated out; and adding a certain amount of seawater to repeatedly wash the porous ceramic plate, so that the salt content of the washed seawater reaches 15-26%, and concentrating to prepare salt. The porous heat absorption ceramic plate has excellent solar radiation absorption rate, can well absorb solar radiation energy, has good heat conductivity, has a two-dimensional or three-dimensional communication structure, can ensure small air flow resistance, is beneficial to uniform distribution and stability of air flow, has a high specific surface area, ensures that a material has a large heat exchange area, solves the problems of large volume and slow seawater volatilization of an evaporation pool of the traditional salt solarization method by using the porous heat absorption ceramic plate as an evaporation medium, and shortens the salt solarization period of seawater.
Description
Technical Field
The invention relates to the field of salt sunning by seawater evaporation, in particular to a method for sunning salt by seawater by utilizing a porous ceramic plate.
Background
Salt extraction from sea water is a traditional and old method and is still widely used up to now. Seawater is firstly introduced into an evaporation tank, when water is evaporated to a certain degree by sunlight and wind power, the seawater is poured into a crystallization tank and is continuously dried in the sun, the seawater becomes saturated solution of salt, the salt is gradually separated out by drying in the sun, the obtained crystals are common crude salt, the residual liquid is called mother liquor, and multiple chemical raw materials such as potassium, magnesium, bromine, sulfate and other valuable minerals can be extracted from the mother liquor.
The traditional salt drying method is to open a salt pan along the sea, gradually evaporate brine to a certain concentration by natural evaporation of the salt pan, and then transfer the brine to a crystallization tank to crystallize and separate out crude salt. Factors affecting evaporation are temperature, area, wind speed and direction, brine concentration, air humidity. In the traditional method, salt drying is only carried out on the surface of an evaporation pool, so that the evaporation area is small, a large amount of floor space is usually needed for increasing the yield, and the salt drying period is long. Along with the expansion of the capacity of the salt factory, the land occupation of the coastal region is continuously expanded, and along with the gradual shortage of coastal land resources, the low-efficiency salt sunning method cannot meet the development of the salt manufacturing industry.
The porous ceramic plate is a ceramic material which is sintered at high temperature and has a large number of pore channel structures which are identical with each other and are communicated with the surface of the material. There are many kinds of porous ceramics, and almost all ceramic materials developed and produced at present can be made into porous bodies by an appropriate process. Porous ceramic materials were developed in the 70's of the 19 th century and were only used as bacterial filters in the early days. Its excellence is increasing with the increase of the level of the fine pore structure. Because the porous ceramic has the advantages of chemical erosion resistance, wear resistance, good high-temperature stability, good electrothermal property, large specific surface area, uniform pore channel distribution, controllable pore size and the like, the application of the porous ceramic is spread in a plurality of fields of environmental protection, energy conservation, chemical industry, petroleum, smelting, food, pharmacy, biomedicine and the like, and the porous ceramic attracts high attention of the global material science community.
The porous heat absorption ceramic is a porous ceramic material which is widely applied, the main materials of the porous heat absorption ceramic comprise alumina, cordierite, silicon carbide and silicon nitride, particularly the silicon nitride and the silicon carbide materials, the porous heat absorption ceramic has the advantages of high heat conductivity coefficient, good oxidation resistance, high heat conductivity coefficient, low thermal expansion coefficient, good wear resistance, light material and the like, and the porous heat absorption ceramic is applied to a solar thermal power generation core component.
Disclosure of Invention
The invention provides a method for drying salt in the sun by utilizing a porous ceramic plate, which aims to solve the problems of large evaporation pool area, slow evaporation, long salt making period and the like in the prior art.
A method for drying salt in the sun by using porous ceramic plates comprises the following steps: the porous ceramic plate after absorbing the seawater utilizes the action of sunlight and wind force to evaporate water in pores of the porous ceramic plate until salt is separated out; and adding a certain amount of seawater to repeatedly wash the porous ceramic plate, so that the salt content of the washed seawater reaches 15-26%, and concentrating to prepare salt.
Preferably, the salt content of the washed seawater reaches 22-26%, and under the concentration, the evaporation time of the seawater is effectively shortened, and the seawater can quickly reach a crystallization point.
Preferably, the porous ceramic plate is a porous heat absorption ceramic plate, and the porous ceramic plate has a heat absorption effect, so that when sunlight irradiates on the porous ceramic plate, the porous ceramic plate absorbs heat and is heated, evaporation of seawater water in pores of the porous ceramic plate is accelerated, and salt crystallization is accelerated.
Preferably, the flushing method is more than one of a high-pressure seawater flushing method and a vacuum filtration flushing method.
Preferably, the porosity of the porous ceramic plate is 40-70%, the pore diameter is 0.2-1 mm, the porous ceramic plate is full of pores, the dispersion of seawater can be guaranteed, the pore diameter is 0.2-1 mm, and seawater can be automatically sucked or permeated into the pores, so that the purposes of water absorption and water retention are achieved.
Preferably, the water absorption rate of the porous ceramic plate is 35-65%.
Preferably, the initial salt content of the seawater is 2-5%.
The porous ceramic plate has a two-dimensional or three-dimensional communicating structure, so that the air flow resistance is small, the uniform distribution and the stability of air flow are facilitated, the specific surface area is high, the material is ensured to have a large heat exchange area, the full volatilization of water is ensured, the speed of the salt drying by the seawater is improved, the porous heat absorption ceramic plate is used as an evaporation medium, the problems that an evaporation pool of the traditional salt drying method is large in size and slow in seawater volatilization are solved, and the period of the salt drying by the seawater is shortened.
Advantageous effects
1. The porous heat absorption ceramic plate has excellent solar radiation absorption rate, can well absorb solar radiation energy, has good heat conductivity, can absorb sunlight, and is beneficial to volatilization of water in the pores.
2. The porous heat absorption ceramic plate has a two-dimensional or three-dimensional communicating structure, can enable air flow resistance to be small, is beneficial to uniform distribution and stability of air flow, has a high specific surface area, ensures that the material has a large heat exchange area, and ensures that moisture is fully volatilized.
3. The invention utilizes the porous heat absorption ceramic plate as an evaporation medium, solves the problems of large volume and slow seawater volatilization of the evaporation pool of the traditional salt solarization method, and shortens the period of salt solarization by seawater.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The following embodiment is carried out in spring for 4-6 months, the air temperature rises quickly at the moment, the rain season is not yet coming, the rainfall is less, the spring weather is dry, the wind power is high, the address is near a certain beach in Shandong sunshine, a black impermeable membrane is paved on the ground, the infiltration of seawater and bittern is prevented, the flushing system in the embodiment comprises a reservoir, a water circulation pipeline, a high-pressure spray device and a vacuum suction filtration device, the high-pressure spray device is positioned above the reservoir, one end of the water circulation pipeline is connected below the reservoir, the other end of the water circulation pipeline is connected with the high-pressure spray device, the seawater in the reservoir is conveyed into the high-pressure spray device above the reservoir, a vacuum pump is installed in the reservoir, the seawater in the flushing process is sucked out through suction filtration by a porous ceramic plate, and the seawater.
Example 1
10 pieces of porous heat absorption ceramic plates with the volume of 100 multiplied by 50 multiplied by 30 cm, the porosity of 50%, the pore diameter of 0.2-1 mm and the water absorption of 35% are soaked in seawater with the salt content of 3.18% for 5 minutes, the soaked porous heat absorption ceramic plates are transferred to a beach, the water in the pores of the porous heat absorption ceramic plates is evaporated under the action of sunlight and wind, the porous heat absorption ceramic plates are placed above a reservoir 1 after 6 hours, the seawater with the volume of 0.1 cubic meter is used, a high-pressure spraying device is utilized to wash the porous ceramic plates for heat absorption, the seawater absorbed by the porous heat absorption ceramic plates in the washing process is sucked out by a vacuum pump and repeatedly washed and sucked out, and after the washing of 10 pieces of porous heat absorption ceramic plates is finished, the salt content of the seawater in the reservoir reaches 18.2%, and.
Example 2
12 pieces of porous heat absorption ceramic plates with the volume of 100 multiplied by 50 multiplied by 30 cm, the porosity of 65%, the pore diameter of 0.2-1 mm and the water absorption of 50% are soaked in seawater with the salt content of 3.18% for 8 minutes, the soaked porous heat absorption ceramic plates are transferred to a beach, the water in the pores of the porous heat absorption ceramic plates is evaporated under the action of sunlight and wind, the porous heat absorption ceramic plates are placed above a reservoir 1 after 7 hours, the seawater with the volume of 0.14 cubic meter is used, a high-pressure spraying device is used for washing the porous ceramic plates to absorb heat, the seawater absorbed by the porous heat absorption ceramic plates in the washing process is sucked out by a vacuum pump and repeatedly washed and sucked out, and after 10 pieces of porous heat absorption ceramic plates are washed, the salt content of the seawater in the reservoir reaches 23.1%, and the seawater is.
Example 3
10 pieces of porous heat absorption ceramic plates with the volume of 100 multiplied by 50 multiplied by 30 cm, the porosity of 70%, the pore diameter of 0.2-1 mm and the water absorption of 65% are soaked in seawater with the salt content of 3.18% for 5 minutes, the soaked porous heat absorption ceramic plates are transferred to a beach, the water in the pores of the porous heat absorption ceramic plates is evaporated under the action of sunlight and wind, the porous heat absorption ceramic plates are placed above a water storage pool 1 after 8 hours, the seawater with the volume of 0.14 cubic meter is used for washing the porous ceramic plates by a high-pressure spraying device to absorb heat, the seawater absorbed by the porous heat absorption ceramic plates in the washing process is sucked out by a vacuum pump and repeatedly washed and sucked out, and after the washing of 10 pieces of porous heat absorption ceramic plates is finished, the salt content of the seawater in the water storage pool 1 reaches 24.6.
Example 4
12 pieces of porous heat absorption ceramic plates with the volume of 100 multiplied by 50 multiplied by 30 cm, the porosity of 40 percent, the pore diameter of 0.2-1 mm and the water absorption of 45 percent are soaked in seawater with the salt content of 3.18 percent for 8 minutes, the soaked porous heat absorption ceramic plates are transferred to a beach, the water in the pores of the porous heat absorption ceramic plates is evaporated under the action of sunlight and wind, the porous heat absorption ceramic plates are placed above a reservoir 1 after 7 hours, 0.12 cubic meter of seawater is used, a high-pressure spraying device is used for washing the porous ceramic plates to absorb heat, the seawater absorbed by the porous heat absorption ceramic plates in the washing process is sucked out by a vacuum pump and repeatedly washed and sucked out, and the seawater in the reservoir reaches 21.6 percent after the 12 pieces of porous heat absorption ceramic plates are washed, and is introduced into a crystallization tank to be concentrated.
Claims (3)
1. A method for drying salt in the sun by using porous ceramic plates is characterized in that the porous ceramic plates soaked and absorbed with seawater evaporate water in pores under the action of sunlight and wind force until salt is separated out; adding a certain amount of seawater to repeatedly wash the porous ceramic plate, so that the salt content of the washed seawater reaches 15-26%, and concentrating to prepare salt;
the porosity of the porous ceramic plate is 40-70%, and the pore diameter is 0.2-1 mm;
the water absorption rate of the porous ceramic plate is 35-65%;
the porous ceramic absorbing the seawater is transferred to a beach for water evaporation;
the flushing method is more than one of a high-pressure seawater flushing method and a vacuum filtration flushing method;
the porous ceramic plate is a porous heat-absorbing ceramic plate.
2. The method for making salt by solarizing seawater with the porous ceramic plate as claimed in claim 1, wherein the salt content of the seawater after washing is 22-26%.
3. The method for making salt by solarizing seawater with the porous ceramic plate as claimed in claim 1, wherein the salt content of the seawater is 2-5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910729191.8A CN110372010B (en) | 2019-08-08 | 2019-08-08 | Method for drying salt in the sun by using porous ceramic plate |
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| CN201910729191.8A CN110372010B (en) | 2019-08-08 | 2019-08-08 | Method for drying salt in the sun by using porous ceramic plate |
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| CN110372010B true CN110372010B (en) | 2020-11-24 |
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| CN111320467B (en) * | 2020-02-26 | 2022-03-22 | 福建师范大学泉港石化研究院 | Porous ceramic plate for solar production of iodized salt and preparation method thereof |
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| CN1308239C (en) * | 2004-12-14 | 2007-04-04 | 天津大学 | Capillary porous material reinforced water evaporating and chromatographic separating process |
| CN102320626A (en) * | 2011-08-01 | 2012-01-18 | 冯静 | Facilities for enlarging evaporation area and increasing solar salt yield |
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