CN216472696U - FMI-NF divides salt crystal system and equipment - Google Patents
FMI-NF divides salt crystal system and equipment Download PDFInfo
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- CN216472696U CN216472696U CN202220205586.5U CN202220205586U CN216472696U CN 216472696 U CN216472696 U CN 216472696U CN 202220205586 U CN202220205586 U CN 202220205586U CN 216472696 U CN216472696 U CN 216472696U
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Abstract
The utility model discloses a FMI-NF divides salt crystal system and equipment, the system includes: the system comprises a freezing crystallization unit, a mirabilite solid-liquid separation unit, a mirabilite hot melting unit and a nanofiltration unit, wherein an inlet of the freezing crystallization unit is used for accessing a divalent salt mother solution of a divalent salt evaporation crystallization system, a crystal slurry outlet of the freezing crystallization unit is connected with a crystal slurry inlet of the mirabilite solid-liquid separation unit, a liquid phase outlet of the mirabilite solid-liquid separation unit is connected with an inlet of a nanofiltration unit, the nanofiltration unit is provided with a divalent salt outlet, and a divalent salt outlet of the nanofiltration unit is used for accessing the divalent salt evaporation crystallization system; the utility model discloses a FMI-NF divides salt crystal system and equipment greatly reduces the outer mother liquor volume of arranging of system, and the miscellaneous salt of reduction system improves the byproduct salt quality, increases the resource recovery utilization ratio of system, reduces the treatment cost who gives up admittedly.
Description
Technical Field
The utility model relates to a sewage treatment technical field, in particular to FMI-NF (Frozen heat Li quor-Nanfiltraton, Frozen mother liquor-nanofiltration) divides salt crystal system and equipment.
Background
At present, with the gradual improvement of the quality requirement of the zero-emission byproduct salt in the coal chemical industry, according to the existing zero-emission process, the method is greatly different from new standards in the aspects of salt production quality, yield and the like, and the prior art is difficult to meet the requirement of enterprises for meeting increasingly strict environmental protection policies in the face of the problems of complex process flow, high operation cost, high solid waste treatment cost and the like of the existing salt separation crystallization process.
The national energy agency issues clear requirements in ' thirteen-five ' program of coal deep processing industry demonstration ', and a newly-built demonstration project of the wastewater body without sodium utilizes technologies such as crystallization and salt separation to recycle high-salinity wastewater. At present, the high-salt waste water salt separation crystallization technology in China is in a starting stage, and the applicability and the economy of various salt separation crystallization technologies are also in a comparative research stage.
There are two representative fractional salt crystallization techniques: firstly, the pretreated high-salinity wastewater is further concentrated and reduced through an evaporator, and then enters a crystallizer to obtain pure salt crystals, a monovalent salt product can be obtained by adopting a mode of crystallizing monovalent salt and divalent salt step by step and adopting high-temperature evaporative crystallization, a divalent salt product is obtained by adopting a low-temperature freezing crystallization heating and melting recrystallization process, and a mother liquor is obtained into mixed salt through a mixed salt crystallizer; and secondly, a membrane-process salt and nitrate co-production process, namely firstly separating or enriching salts with different valence states before crystallization through a membrane separation process, then crystallizing through a thermal method to obtain a monovalent salt product, enabling mother liquor to enter a freezing crystallization unit to obtain a divalent salt product, and finally drying the mother liquor to obtain the miscellaneous salt.
The purity of the crystal salt produced in the traditional process is poor, the produced frozen crystallization mother liquor is dried to obtain miscellaneous salt for solid waste treatment, and finally, the purity of the crystal salt is low, the resource utilization rate is low, the content of the miscellaneous salt is high, and the solid waste treatment cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome foretell not enough, provide a miscellaneous salt decrement technique that high efficiency, energy-conservation, have good feature of environmental protection and economic nature, promptly a FMI-NF divides salt crystal system and equipment.
The FMI-NF salt separation crystallization system comprises a freezing crystallization unit, a mirabilite solid-liquid separation unit, a mirabilite hot melting unit and a nanofiltration unit, wherein an inlet of the freezing crystallization unit is used for being connected with divalent salt mother liquor of a divalent salt evaporation crystallization system, a crystal slurry outlet of the freezing crystallization unit is connected with a crystal slurry inlet of the mirabilite solid-liquid separation unit, a liquid phase outlet of the mirabilite solid-liquid separation unit is connected with an inlet of the nanofiltration unit, the nanofiltration unit is provided with a divalent salt outlet, and a divalent salt outlet of the nanofiltration unit is used for being connected with the divalent salt evaporation crystallization system.
Furthermore, the FMI-NF salt separation crystallization system further comprises a mirabilite hot melting unit and a mixed salt evaporation crystallization unit, a solid phase outlet of the mirabilite solid-liquid separation unit is connected with a mirabilite inlet of the mirabilite hot melting unit, a crystal slurry outlet of the mirabilite hot melting unit is connected with an inlet of the mixed salt evaporation crystallization unit, and a crystal slurry outlet of the mixed salt evaporation crystallization unit is used for being connected with the divalent salt evaporation crystallization system.
Furthermore, the mirabilite hot melting unit is also provided with a high-temperature liquid inlet connected with a high-temperature liquid source, and the temperature of the high-temperature liquid source is higher than 80 ℃.
Furthermore, the mixed salt evaporation crystallization unit comprises a mixed salt circulating pump, a mixed salt heater and a mixed salt crystallizer which are sequentially connected, an inlet of the mixed salt circulating pump is connected with a crystal slurry outlet of the mirabilite hot melting unit, a feed liquid outlet of the mixed salt crystallizer is connected with an inlet of the mixed salt circulating pump, and a feed liquid outlet of the mixed salt crystallizer is also used for being connected to a divalent salt evaporation crystallization system.
Further, the freezing crystallization unit comprises a freezing circulating pump, a freezing device and a freezing crystallizer, wherein an inlet of the freezing circulating pump is used for being connected with divalent salt mother liquor of a divalent salt evaporation crystallization system, the freezing device comprises a freezing heat exchanger water-cooling unit and a refrigerant storage tank, refrigerants of the water-cooling unit are connected into the freezing heat exchanger through the refrigerant storage tank, the refrigerants are connected into the water-cooling unit through the refrigerant storage tank after heat exchange, a feed liquid outlet of the freezing circulating pump is connected with a feed liquid inlet of the freezing heat exchanger, a feed liquid outlet of the freezing heat exchanger is connected with a feed liquid inlet of the freezing crystallizer, a feed liquid outlet of the freezing crystallizer is connected with an inlet of the freezing circulating pump, and salt legs of the freezing crystallizer are connected with an inlet of a mirabilite solid-liquid separation unit.
Further, the output temperature of the refrigerating device is minus 10 ℃ to minus 5 ℃.
According to another aspect of the invention, the FMI-NF salt separation crystallization equipment comprises a divalent salt crystallization evaporation system and the FMI-NF salt separation crystallization system, wherein a divalent salt outlet of the nanofiltration unit is connected to the divalent salt evaporation crystallization system.
Further, the divalent salt evaporation crystallization system comprises a divalent salt evaporation crystallization unit, a divalent salt solid-liquid separation unit, a divalent salt mother liquor storage unit and a divalent salt drying system, wherein an inlet of the divalent salt evaporation crystallization unit is used for receiving high-salt wastewater, a crystal slurry outlet of the divalent salt evaporation crystallization unit is connected with an inlet of the divalent salt solid-liquid separation unit, a solid phase outlet of the divalent salt solid-liquid separation unit is connected with the divalent salt drying system, a liquid phase outlet of the divalent salt solid-liquid separation unit is connected with an inlet of the divalent salt mother liquor storage unit, and an outlet of the divalent salt mother liquor storage unit is connected with an inlet of the freezing crystallization unit.
Furthermore, the FMI-NF salt separation crystallization system further comprises a mirabilite hot melting unit and a mixed salt evaporation crystallization unit, wherein a solid phase outlet of the mirabilite solid-liquid separation unit is connected with a mirabilite inlet of the mirabilite hot melting unit, a crystal slurry outlet of the mirabilite hot melting unit is connected with an inlet of the mixed salt evaporation crystallization unit, and a crystal slurry outlet of the mixed salt evaporation crystallization unit is connected with an inlet of the divalent salt solid-liquid separation unit.
The utility model discloses beneficial effect for prior art does: to the low technical difficulty of traditional technology by-product salt purity, the utility model discloses a freezing crystallization system realizes the salt crystallization process of branch of monovalent salt and divalent salt with the coupling of nanofiltration system, through with freezing mother liquor pump sending to the nanofiltration system, further carry out the concentrated decrement to freezing mother liquor, and separate the metal salt of different valence states, nanofiltration concentrated water gets into the evaporation crystallization system once more, greatly reduce the outer mother liquor volume of arranging of system, reduce the system miscellaneous salt, improve the by-product salt quality, increase the resource recovery utilization ratio of system, reduce the treatment cost of solid waste, the evaporation crystallization unit that the invention provided all adopts circulation flow rate control with the improvement heat exchange tube velocity of flow with glauber's salt hot melt crystallization unit, guarantee the homogeneity of crystal salt particle diameter, reduce equipment scale deposit risk, improve equipment operating efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an FMI-NF salt separation crystallization device in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a freezing crystallization unit, a divalent salt solid-liquid separation unit and a nanofiltration unit connected in sequence in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the mirabilite hot-melting unit and the mixed salt evaporative crystallization unit connected in sequence in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in figure 1, the FMI-NF salt separation crystallization device in the embodiment comprises a divalent salt crystallization evaporation system and an FMI-NF salt separation crystallization system, and is mainly used for high-salinity wastewater sources with higher divalent salt content.
The divalent salt evaporative crystallization system comprises a divalent salt evaporative crystallization unit, a divalent salt solid-liquid separation unit, a divalent salt mother liquor storage unit 16 and a divalent salt drying system 21.
The inlet of the divalent salt evaporation crystallization unit is connected with a high-salt wastewater source after pretreatment, membrane concentration and other treatment processes, the magma outlet of the divalent salt evaporation crystallization unit is connected with the inlet of the divalent salt solid-liquid separation unit, and the divalent salt evaporation crystallization unit adopts MVR (Mechanical Vapor Recompression) or multi-effect evaporation technology. In this embodiment, the divalent salt evaporative crystallization unit adopts an MVR evaporative crystallization technology, and includes a vapor compressor 20, a circulation pipeline, and a forced circulation pump 17, a forced circulation heat exchanger 18, and a divalent salt crystallizer 19 sequentially disposed on the circulation pipeline.
The inlet of the circulating pipeline (namely the inlet of a forced circulation pump 17) is connected with a high-salinity wastewater source, the feed liquid outlet of the forced circulation pump 17 is connected with the feed liquid inlet of a forced circulation heat exchanger 18, the feed liquid outlet of the forced circulation heat exchanger 18 is connected with the feed liquid inlet of a divalent salt crystallizer 19, the feed liquid outlet of the divalent salt crystallizer 19 is connected with the feed liquid inlet of the forced circulation pump 17, the crystal slurry outlet of the circulating pipeline (namely the salt leg of the divalent salt crystallizer 19) is connected with the inlet of a divalent salt solid-liquid separation unit, and the steam outlet of the divalent salt crystallizer 19 is connected with a steam compressor 20. A vapor compressor 20 is connected to the forced circulation heat exchanger 18 for supplying high temperature vapor to the forced circulation heat exchanger 18. The divalent salt solid-liquid separation unit comprises a divalent salt thickener 7 and a divalent salt centrifuge 15. The inlet of the divalent salt thickener 7 is connected with the salt leg of the divalent salt crystallizer 19, and the outlet is connected with the inlet of the divalent salt centrifuge 15. The solid phase outlet of the divalent salt centrifuge 15 is connected with the divalent salt drying system 21, and the liquid phase outlet is connected with the inlet of the divalent salt mother liquor storage unit 16.
The divalent salt mother liquor outlet of the divalent salt mother liquor storage unit 16 is connected with the inlet of the freezing and crystallizing unit. In this embodiment, the divalent salt mother liquor storage unit is a sodium sulfate mother liquor tank.
The high-salt wastewater enters a divalent salt evaporation crystallization unit to be evaporated and crystallized to obtain crystal slurry liquid, then enters a divalent salt solid-liquid separation device to obtain high-temperature sodium sulfate mother liquid and sodium sulfate crystallized salt, the high-temperature sodium sulfate mother liquid enters a divalent salt mother liquid storage unit 16, and the obtained sodium sulfate crystallized salt enters a divalent salt drying system 21 to be dried.
Fig. 2 is a schematic structural diagram of a freezing crystallization unit, a divalent salt solid-liquid separation unit and a nanofiltration unit which are connected in sequence in the embodiment of the present invention. Fig. 3 is a schematic structural diagram of the divalent salt solid-liquid separation unit mirabilite hot-melting unit and the mixed salt evaporative crystallization unit connected in sequence in the embodiment of the present invention.
As shown in fig. 2 and 3, the FMI-NF salt separation crystallization system includes a freezing feed storage unit, a freezing crystallization unit, a mirabilite solid-liquid separation unit, a mirabilite hot-melting unit 2, a mixed salt evaporation crystallization unit, a steam condensation system 9, a freezing mother liquor storage unit 3, and a nanofiltration unit 8.
The inlet of the freezing feeding storage unit is connected with a divalent salt mother liquor outlet of a divalent salt evaporation crystallization system (namely a sodium sulfate mother liquor tank), and divalent salt mother liquor (sodium sulfate mother liquor) output by the divalent salt evaporation crystallization system is conveyed to the inlet of the freezing feeding tank through a liquid phase pipeline by a mother liquor pump outlet.
When the temperature of the forced circulation heat exchanger 18 reaches a predetermined temperature, the divalent salt mother liquor (sodium sulfate mother liquor) of the divalent salt mother liquor storage unit 16 is sent to the inlet of the freezing feed tank through the liquid phase line by the mother liquor pump outlet.
The inlet of the freezing crystallization unit is connected with the divalent salt mother liquor outlet of the freezing feeding storage unit, and the crystal slurry outlet of the freezing crystallization unit is connected with the crystal slurry inlet of the mirabilite solid-liquid separation unit. The freezing and crystallizing unit comprises a freezing and circulating pump 11, a freezing device and a freezing crystallizer 10.
The refrigerating device comprises a refrigerating heat exchanger 12, a water cooling unit 13 and a refrigerant storage tank 14, wherein a feed liquid inlet of the refrigerating heat exchanger 12 is connected with a feed liquid outlet of a refrigerating circulating pump 11, and a feed liquid outlet of the refrigerating heat exchanger 12 is connected with a feed liquid inlet of a refrigerating crystallizer 10. The refrigerant of the water chiller unit 13 is connected to the freezing heat exchanger 12 through the refrigerant storage tank 14, and is connected to the water chiller unit 13 through the refrigerant storage tank 14 after heat exchange.
The feed liquid outlet of the freezing crystallizer 10 is connected with the inlet of a freezing circulating pump 11. The upper end of the freezing crystallizer 10 is provided with an overflow port, and the overflow port in the freezing crystallizer 10 is connected into the freezing mother liquor storage unit 3 through a liquid phase pipeline. The fine crystal mother liquor in the freezing crystallizer 10 is connected to the inlet of a freezing mother liquor tank through a liquid phase pipeline and is sent to the nanofiltration unit 8 together with the mother liquor at the liquid phase outlet of the mirabilite centrifuge 1. The salt leg of the freezing crystallizer 10 is connected with the inlet of a mirabilite solid-liquid separation unit.
The output temperature of the refrigerating device (namely, the temperature of a refrigerant) is minus 10 ℃ to minus 5 ℃.
And (4) allowing the sodium sulfate mother liquor to enter a freezing and crystallizing unit for freezing and crystallizing to obtain crystal slurry containing mirabilite.
The mirabilite solid-liquid separation unit is a mirabilite centrifuge 1, the solid-phase outlet of the mirabilite solid-liquid separation unit is connected with the mirabilite inlet of the mirabilite hot melting unit 2, and the liquid-phase outlet of the mirabilite solid-liquid separation unit is connected with the frozen mother liquor storage unit 3.
The mirabilite hot melting unit 2 is also provided with a high-temperature liquid inlet connected with a high-temperature liquid source, and the liquid temperature of the high-temperature liquid source is higher than 80 ℃. In this embodiment, the high-temperature liquid in the high-temperature liquid source is the high-temperature mother liquid in the divalent salt mother liquid storage unit 16. The crystal slurry outlet of the mirabilite hot melting unit 2 is connected with the feed liquid inlet of the mixed salt evaporation concentration unit. In this embodiment, the mirabilite hot-melting unit 2 is a mirabilite hot-melting tank.
The method comprises the following steps that crystal water of mirabilite is lost at 70-80 ℃, high-temperature sodium sulfate mother liquor is introduced into a mirabilite hot melting tank, the temperature of the mother liquor is higher than 80 ℃, heat is provided by the high-temperature sodium sulfate mother liquor to enable sodium sulfate to be dissolved in the crystal water of the mother liquor to form saturated solution, crystal slurry mixed liquid of anhydrous sodium sulfate crystals and supersaturated sodium sulfate solution is obtained, and a crystal slurry outlet of the mirabilite hot melting tank sends the melted crystal slurry mixed solution to a mixed salt evaporation crystallization unit through a liquid phase pipeline.
The mixed salt evaporation crystallization unit comprises a mixed salt circulating pump, a mixed salt heater 6 and a mixed salt crystallizer 4 which are sequentially connected, an inlet of the mixed salt circulating pump 5 is connected with a crystal slurry outlet of the mirabilite hot melting unit 2, a feed liquid outlet of the mixed salt circulating pump 5 is connected with a feed liquid inlet of the mixed salt heater 6, a feed liquid outlet of the mixed salt heater 6 is connected with a feed liquid inlet of the mixed salt crystallizer 4, a feed liquid outlet of the mixed salt crystallizer 4 is connected with an inlet of the mixed salt circulating pump 5, and a feed liquid outlet of the mixed salt crystallizer 4 is also used for being connected with an inlet of the divalent salt thickener 7. And a steam outlet of the mixed salt crystallizer 4 is connected into a steam condensing unit through a low-pressure non-condensing pipeline, and a steam condensing system 9 condenses and recovers secondary steam output by the mixed salt crystallizer 4.
And (4) conveying the crystal slurry mixed liquid to a mixed salt evaporation crystallization unit by a material transfer pump, and performing material circulating concentration. The material passes through mixed salt circulating pump 5, gets into mixed salt heater 6, gets into mixed salt crystallizer 4 after in order to reach evaporating temperature through abundant heat transfer, and evaporation part moisture reaches ejection of compact concentration after, and the feed liquid is sent into the import of divalent salt solid-liquid separation unit through the discharge pump export promptly, gets into divalent salt evaporative crystallization system, and the secondary steam of mixed salt crystallizer 4 sends into steam condensing system 9 through the pipeline that does not condense. The material is mixed with the crystal slurry liquid output by the divalent salt evaporation crystallization unit through the divalent salt thickener 7, and enters a divalent salt solid-liquid separation device for solid-liquid separation, wet salt enters a drying system to finally obtain sodium sulfate crystal salt, and the liquid phase enters a sodium sulfate mother liquor tank and enters the divalent salt evaporation crystallization unit from a mother liquor pump outlet for evaporation crystallization.
The mother liquor outlet of the freezing mother liquor storage unit 3 is connected with the inlet of the nanofiltration unit 8. In the present embodiment, the frozen mother liquid storage unit 3 is a frozen mother liquid tank.
The nanofiltration unit 8 is provided with a monovalent salt outlet and a divalent salt outlet, the monovalent salt outlet of the nanofiltration unit 8 is used for being connected with the monovalent salt evaporation crystallization system, and the divalent salt outlet of the nanofiltration unit 8 is connected with the divalent salt evaporation crystallization system.
The working principle of the FMI-NF salt separation crystallization equipment in the embodiment is as follows: sodium sulfate mother liquor (sodium sulfate mother liquor in a divalent salt mother liquor storage unit 16) discharged from the divalent salt evaporation crystallization system enters an FMI-NF salt separation crystallization system, and first passes through a freezing crystallization unit of the FMI-NF salt separation crystallization system to form crystal slurry liquid containing mirabilite, sodium chloride and a small amount of sodium sulfate, and then passes through a mirabilite centrifuge 1 to obtain solid mirabilite and freezing mother liquor.
Solid mirabilite enters a mirabilite hot-melting unit 2 through a solid phase outlet of a mirabilite centrifugal machine 1, the solid mirabilite is hot-melted at high temperature by high-temperature sodium sulfate mother liquor accessed in the mirabilite hot-melting unit 2, so that part of sodium sulfate is dissolved in self crystallization water to form saturated solution, the saturated solution is mixed with the sodium sulfate mother liquor accessed in a hot-melting tank, and then the mixed solution is evaporated and concentrated by a mixed salt crystallization unit and then enters a divalent salt evaporation crystallization system for sodium sulfate evaporation and crystallization.
The frozen mother liquor is pumped to a nanofiltration unit 8, the aperture of a nanofiltration membrane of the nanofiltration unit 8 is usually 1-2 nm, and the separation of monovalent ions and multivalent ions is realized by the polyelectrolyte on the surface of the nanofiltration membrane through electrostatic action, so that divalent salts can be continuously and selectively intercepted by the nanofiltration membrane, sodium sulfate enters a divalent salt evaporation crystallization system again after being concentrated and reduced in nanofiltration concentrated water, the sodium sulfate enriched in the concentrated water is further recovered through a thermal salt separation process, and the salt separation crystallization process flow of monovalent salts and divalent salts is realized by coupling the freezing crystallization system and the nanofiltration system, so that a circulation system of sodium sulfate evaporation crystallization is formed.
Aiming at the technical difficulty of low purity of the byproduct salt in the traditional process, the utility model further separates and concentrates the frozen mother liquor by coupling the freezing crystallization and the nanofiltration system, thereby realizing the decrement of the discharged mother liquor and improving the purity of the high yield salt; the frozen mother liquor separated and concentrated by the nanofiltration system is recycled to the evaporative crystallization system, so that the discharge of miscellaneous salt is reduced, and the solid waste treatment cost is reduced.
To sum up, it is the specific application example of the present invention, to the protection scope of the present invention does not constitute a limitation, and the technical solution adopting equivalent replacement all falls within the protection scope of the present invention.
Claims (9)
1. An FMI-NF salt separation crystallization system, comprising: the system comprises a freezing crystallization unit, a mirabilite solid-liquid separation unit and a nanofiltration unit, wherein an inlet of the freezing crystallization unit is used for accessing a divalent salt mother solution of a divalent salt evaporation crystallization system, a crystal slurry outlet of the freezing crystallization unit is connected with a crystal slurry inlet of the mirabilite solid-liquid separation unit, a liquid phase outlet of the mirabilite solid-liquid separation unit is connected with an inlet of the nanofiltration unit, the nanofiltration unit is provided with a divalent salt outlet, and a divalent salt outlet of the nanofiltration unit is used for accessing the divalent salt evaporation crystallization system.
2. The FMI-NF salt separation and crystallization system according to claim 1, wherein the FMI-NF salt separation and crystallization system further comprises a mirabilite hot melting unit and a mixed salt evaporation and crystallization unit, a solid phase outlet of the mirabilite solid-liquid separation unit is connected with a mirabilite inlet of the mirabilite hot melting unit, a crystal slurry outlet of the mirabilite hot melting unit is connected with an inlet of the mixed salt evaporation and crystallization unit, and a crystal slurry outlet of the mixed salt evaporation and crystallization unit is used for being connected to a divalent salt evaporation and crystallization system.
3. An FMI-NF salt separation crystallization system as in claim 2 wherein said salt cake hot melt unit further includes a high temperature liquid inlet connected to a high temperature liquid source, said high temperature liquid source being at a temperature greater than 80 ℃.
4. The FMI-NF salt separation crystallization system according to claim 2, wherein the mixed salt evaporation crystallization unit comprises a mixed salt circulating pump, a mixed salt heater and a mixed salt crystallizer which are connected in sequence, an inlet of the mixed salt circulating pump is connected with a crystal slurry outlet of the mirabilite hot melting unit, an outlet of the mixed salt crystallizer is connected with an inlet of the mixed salt circulating pump, and a feed liquid outlet of the mixed salt crystallizer is further used for being connected to a divalent salt evaporation crystallization system.
5. An FMI-NF salt separation crystallization system as in claim 1, wherein, the freezing and crystallizing unit comprises a freezing circulating pump, a freezing device and a freezing crystallizer, an inlet of the freezing circulating pump is used for accessing a divalent salt mother liquor of a divalent salt evaporation and crystallization system, the refrigerating device comprises a refrigerating heat exchanger water-cooling unit and a refrigerant storage tank, wherein the refrigerant of the water-cooling unit is connected into the refrigerating heat exchanger through the refrigerant storage tank, is connected into the water-cooling unit through the refrigerant storage tank after heat exchange, the feed liquid outlet of the freezing circulating pump is connected with the feed liquid inlet of the freezing heat exchanger, the feed liquid outlet of the freezing heat exchanger is connected with the feed liquid inlet of the freezing crystallizer, and a feed liquid outlet of the freezing crystallizer is connected with an inlet of the freezing circulating pump, and a salt leg of the freezing crystallizer is connected with an inlet of the mirabilite solid-liquid separation unit.
6. An FMI-NF salt separation crystallization system as in claim 5, wherein the output temperature of the freezing device is-10 ℃ to-5 ℃.
7. An FMI-NF salt separation crystallization device, which is characterized by comprising a divalent salt crystallization evaporation system and the FMI-NF salt separation crystallization system as claimed in any one of claims 1-6, wherein a divalent salt outlet of the nanofiltration unit is connected to the divalent salt evaporation crystallization system.
8. The FMI-NF salt separation crystallization device as in claim 7, wherein the divalent salt evaporation crystallization system comprises a divalent salt evaporation crystallization unit, a divalent salt solid-liquid separation unit, a divalent salt mother liquid storage unit and a divalent salt drying system, an inlet of the divalent salt evaporation crystallization unit is used for receiving high-salt wastewater, a magma outlet of the divalent salt evaporation crystallization unit is connected with an inlet of the divalent salt solid-liquid separation unit, a solid phase outlet of the divalent salt solid-liquid separation unit is connected with the divalent salt drying system, a liquid phase outlet of the divalent salt solid-liquid separation unit is connected with an inlet of the divalent salt mother liquid storage unit, and an outlet of the divalent salt mother liquid storage unit is connected with an inlet of the freezing crystallization unit.
9. The FMI-NF salt separation crystallization device according to claim 8, wherein the FMI-NF salt separation crystallization system further comprises a mirabilite hot melting unit and a mixed salt evaporation crystallization unit, a solid phase outlet of the mirabilite solid-liquid separation unit is connected with a mirabilite inlet of the mirabilite hot melting unit, a crystal slurry outlet of the mirabilite hot melting unit is connected with an inlet of the mixed salt evaporation crystallization unit, and a crystal slurry outlet of the mixed salt evaporation crystallization unit is connected with an inlet of the divalent salt solid-liquid separation unit.
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