CN116655192B - High mineral mine drainage water resourceful treatment system - Google Patents
High mineral mine drainage water resourceful treatment system Download PDFInfo
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- CN116655192B CN116655192B CN202310954446.7A CN202310954446A CN116655192B CN 116655192 B CN116655192 B CN 116655192B CN 202310954446 A CN202310954446 A CN 202310954446A CN 116655192 B CN116655192 B CN 116655192B
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- 239000003657 drainage water Substances 0.000 title claims abstract description 26
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 19
- 239000011707 mineral Substances 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 125
- 238000001728 nano-filtration Methods 0.000 claims abstract description 100
- 238000002425 crystallisation Methods 0.000 claims abstract description 61
- 230000008025 crystallization Effects 0.000 claims abstract description 61
- 238000001704 evaporation Methods 0.000 claims abstract description 47
- 230000008020 evaporation Effects 0.000 claims abstract description 47
- 238000001914 filtration Methods 0.000 claims abstract description 39
- 238000000926 separation method Methods 0.000 claims abstract description 39
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 39
- 239000013078 crystal Substances 0.000 claims abstract description 37
- 150000003839 salts Chemical class 0.000 claims abstract description 37
- 238000004064 recycling Methods 0.000 claims abstract description 32
- 230000009467 reduction Effects 0.000 claims abstract description 30
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 26
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000001110 calcium chloride Substances 0.000 claims abstract description 19
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 239000011780 sodium chloride Substances 0.000 claims abstract description 14
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 39
- 238000001223 reverse osmosis Methods 0.000 claims description 32
- 239000012528 membrane Substances 0.000 claims description 19
- 235000010755 mineral Nutrition 0.000 claims description 13
- 230000001112 coagulating effect Effects 0.000 claims description 12
- 238000004062 sedimentation Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 239000002455 scale inhibitor Substances 0.000 claims description 11
- 239000003814 drug Substances 0.000 claims description 9
- 238000005273 aeration Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 7
- 238000005352 clarification Methods 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 4
- 238000012806 monitoring device Methods 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 8
- 239000012141 concentrate Substances 0.000 abstract description 4
- 229960002713 calcium chloride Drugs 0.000 description 15
- 239000000047 product Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 229910001424 calcium ion Inorganic materials 0.000 description 6
- 238000013327 media filtration Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 150000001450 anions Chemical class 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 229910001415 sodium ion Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- LLSDKQJKOVVTOJ-UHFFFAOYSA-L calcium chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Ca+2] LLSDKQJKOVVTOJ-UHFFFAOYSA-L 0.000 description 1
- 229940052299 calcium chloride dihydrate Drugs 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the field of water treatment, in particular to a high-mineral mine drainage water recycling treatment system. Preliminary removing suspended matter impurities in the water body by arranging a pretreatment unit reduction unit and a crystallization pretreatment unit; concentrating and filtering the water body with the impurities removed by a crystallization pretreatment unit, and further removing suspended matters in concentrated solution water; the crystallization pretreatment unit is connected with a first-stage nanofiltration device of the salt separation unit, high-quality reclaimed water is produced after the separation of the first-stage nanofiltration device, and the residual concentrated solution sequentially passes through a first crystallizer, a first multi-medium filtration device, a first ultrafiltration device and a second-stage nanofiltration device to realize the separation of nanofiltration produced water and nanofiltration concentrated water; the nanofiltration product water and the nanofiltration concentrate are respectively connected into the first evaporation crystallization unit and the second evaporation crystallization unit, so that the recycling of the high-quality reclaimed water is realized, the salt separation extraction of sodium chloride and calcium chloride is realized, and the recycling rate of the high-quality reclaimed water and the extraction of the recycled crystal salt are improved.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a high-mineral mine drainage water recycling treatment system.
Background
According to the characteristics of pollutants contained in mine water, mine water is divided into five types of clean, high-suspended matters, acidity, high minerals and special pollutants, and in the treatment of mine drainage water of the high minerals, most of the mine drainage water is treated by adopting coagulating sedimentation treated by lime and filtering, and recycling is carried out by utilizing membrane concentration technology such as reverse osmosis, electrodialysis and the like. In actual operation, the operation stability is poor, the operation and maintenance cost is high, and the standard treatment effect is limited. In turn, not only valuable groundwater resources are wasted, but also a series of environmental pollution problems can be caused.
Disclosure of Invention
The invention aims to provide a high mineral mine drainage water recycling treatment system which has high reuse rate of produced water and can realize recovery of various salts and generate no other impurities.
In order to achieve the above purpose, the invention provides a high mineral mine drainage water recycling treatment system, which comprises a pretreatment unit, a reduction unit, a crystallization pretreatment unit, a salt separation unit, a first evaporation crystallization unit and a second evaporation crystallization unit;
the output end of the pretreatment unit is connected with the reduction unit, and the concentrated solution generated by the reduction unit is connected with the crystallization pretreatment unit;
the salt separation unit comprises a first-stage nanofiltration device, a first crystallizer, a first multi-medium filtration device, a first ultrafiltration device and a second-stage nanofiltration device, and the output end of the crystallization pretreatment unit is connected with the first-stage nanofiltration device of the salt separation unit;
the first-stage nanofiltration device, the first crystallizer, the first multi-medium filtration device, the first ultrafiltration device and the second nanofiltration device are connected through pipelines in sequence, concentrated solution is separated by the first-stage nanofiltration device to generate high-quality reclaimed water, residual concentrated solution enters the first crystallizer, the hardness of the concentrated solution can be reduced after adding a medicament to generate calcium sulfate crystals, the water outlet end of the first crystallizer is sequentially connected with the first multi-medium filtration device and the first ultrafiltration device, the water outlet end of the first ultrafiltration device is connected with the second nanofiltration device, produced water separated by the second nanofiltration device is connected with the first evaporation crystallization unit, and concentrated water separated by the second nanofiltration device is connected with the second evaporation crystallization unit.
Optionally, the first-stage nanofiltration device is a positively charged nanofiltration membrane, and the flux of the positively charged nanofiltration membrane is 20-30 MLH.
Optionally, a second crystallizer is connected to the water outlet end of the secondary nanofiltration device, and calcium sulfate crystals with purity reaching more than 95% can be separated out after the hardness is reduced by the second crystallizer.
Optionally, the scale inhibitor is put into the primary nanofiltration device and the secondary nanofiltration device, and a monitoring device is arranged to monitor the input amount of the scale inhibitor.
Optionally, the chemical added in the first crystallizer is an inducing chemical and a flocculating agent, so as to increase precipitation of calcium sulfate crystals and avoid introducing other impurities.
Optionally, the pretreatment unit comprises an aeration tank, a coagulating sedimentation tank and a second multi-medium filtering device, the aeration tank, the coagulating sedimentation tank and the second multi-medium filtering device are connected through pipelines in sequence, and the output end of the second multi-medium filtering device is connected into the reduction unit.
Optionally, the reduction unit includes a second ultrafiltration device and a first reverse osmosis device, a water producing end of the second ultrafiltration device is connected with the first reverse osmosis device, the produced water can generate high-quality regenerated water after being filtered by the first reverse osmosis device, an output end of the pretreatment unit is connected with the second ultrafiltration device, and an output end of the first reverse osmosis device is connected with the crystallization pretreatment unit.
Optionally, the crystallization pretreatment unit includes high-efficient clarifier, third multi-media filter equipment and third ultrafiltration device, high-efficient clarifier, third multi-media filter equipment with third ultrafiltration device pipeline connection in proper order, the output of reduction unit inserts high-efficient clarifier, the output of third ultrafiltration device inserts the one-level nanofiltration device of dividing the salt unit throw into calcium hydrate in order to get rid of aquatic impurity and improve the separation volume of resourceful crystal in the high-efficient clarifier.
Optionally, the first evaporation crystallization unit includes second reverse osmosis unit, first high density pond, fourth multi-media filter equipment, first solar concentration pond, second high density pond and first evaporation crystallizer, second nanofiltration unit's water production end inserts second reverse osmosis unit, second nanofiltration unit's water production is through second reverse osmosis unit is further concentrated the back and can produce high quality reclaimed water, and remaining concentrate passes through in proper order first high density pond fourth multi-media filter equipment, first solar concentration pond, second high density pond and produce high quality sodium chloride crystal behind the first evaporation crystallizer.
Optionally, the second evaporation crystallization unit includes third crystallizer, third high density pond, fifth multi-media filter equipment, second solar concentration pond, fourth high density pond, second evaporation crystallizer, multiple effect evaporation plant and drying device, second nanofiltration device's dense water end inserts the third crystallizer, second nanofiltration device's dense water can produce the calcium sulfate crystal after the third crystallizer crystallization, and remaining concentrate passes through in proper order behind third high density pond, fifth multi-media filter equipment, second solar concentration pond, fourth high density pond and the second evaporation crystallizer produces liquid calcium chloride, liquid calcium chloride passes through in proper order multiple effect evaporation plant with the drying device is back to precipitate calcium chloride crystal.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
according to the high-mineral mine drainage water recycling treatment system, firstly, suspended matters, colloid, hardness and impurities in water are primarily removed through the pretreatment unit, the quality of incoming water of the subsequent treatment unit is improved, then the output end of the pretreatment unit is connected with the reduction unit, the pretreated water is further filtered and purified, the desalination of high-concentration saline water is realized, and high-quality reclaimed water is obtained; secondly, concentrating and filtering by a crystallization pretreatment unit, and further removing suspended matters in concentrated liquid water; thirdly, the output end of the crystallization pretreatment unit is connected with a first-stage nanofiltration device of the salt separation unit, high-quality reclaimed water is generated after the first-stage nanofiltration device is separated, and then the residual concentrated solution sequentially passes through a first crystallizer, a first multi-medium filtration device, a first ultrafiltration device and a second-stage nanofiltration device to finally realize the effects of permanent hardness removal and 90% separation of sodium ions and calcium ions; finally, the nanofiltration product water and the nanofiltration concentrated water are respectively connected into the first evaporation crystallization unit and the second evaporation crystallization unit, so that the recycling of the high-quality reclaimed water is realized, the salt separation extraction of sodium chloride and calcium chloride which have economic values and can be directly sold as industrial products is realized, and the recycling rate of the high-quality reclaimed water and the recycling efficiency of crystal salt are improved. In each processing unit, the dosage of the medicament and the output of solid waste are greatly reduced, each resource substance is separated out with the lowest energy consumption, and the system reliability and the running cost of the recycling of the mine drainage water of the type are greatly improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a mine drainage water recycling system according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of a preprocessing unit according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a reduction unit according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a crystallization pretreatment unit according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a salt separation unit according to an embodiment of the invention;
FIG. 6 is a schematic flow chart of a first evaporative crystallization unit according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a second evaporative crystallization unit according to an embodiment of the present invention.
Wherein, 1, a pretreatment unit; 11. an aeration tank; 12. a coagulating sedimentation tank; 13. a second multi-media filtration device; 2. a reduction unit; 21. a second ultrafiltration device; 22. a first reverse osmosis unit; 3. a crystallization pretreatment unit; 31. an efficient clarification tank; 32. a third multi-media filtration device; 33. a third ultrafiltration device; 4. a salt separation unit; 41. a first stage nanofiltration device; 42. a first crystallizer; 43. a first multi-media filtration device; 44. a first ultrafiltration device; 45. a secondary nanofiltration device; 46. a second crystallizer; 5. a first evaporative crystallization unit; 51. a second reverse osmosis unit; 52. a first high density pool; 53. a fourth multi-media filtration device; 54. a first evaporative crystallizer; 55. a first solar concentration tank; 56. a second high density pool; 6. a second evaporative crystallization unit; 61. a third crystallizer; 62. a third high density pool; 63. a fifth multi-media filtration device; 64. a second evaporative crystallizer; 65. a multi-effect evaporation device; 66. a drying device; 67. a second solar concentration tank; 68. and a fourth high-density pool.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the invention.
The high mineral mine drainage water recycling treatment system is described in detail by specific examples:
referring to fig. 1 and 5, the high mineral mine drainage water recycling treatment system provided by the invention comprises a pretreatment unit 1, a reduction unit 2, a crystallization pretreatment unit 3, a salt separation unit 4, a first evaporation crystallization unit 5 and a second evaporation crystallization unit 6; the mine drainage water sequentially passes through a pretreatment unit 1, a reduction unit 2, a crystallization pretreatment unit 3, a salt separation unit 4, a first evaporation crystallization unit 5 and a second evaporation crystallization unit 6, and finally high-quality reclaimed water, sodium chloride crystals, calcium chloride crystals and calcium sulfate crystals can be obtained.
Specifically, the output end of the pretreatment unit 1 is connected with the reduction unit 2, and the concentrated solution generated by the reduction unit 2 is connected with the crystallization pretreatment unit 3; the mine drainage water is subjected to preliminary treatment by the pretreatment unit 1, suspended matters, colloid, hardness and other impurities in the water can be removed, and the quality of incoming water meeting the requirements is provided for the treatment of other subsequent units. Then the output end of the pretreatment unit 1 is connected with the reduction unit 2, the pretreated water is further filtered and purified by the reduction unit 2, and the first part of high-quality reclaimed water can be generated, and the recovery rate of the high-quality reclaimed water is not lower than 70% and meets the requirement of effluent quality at the moment and can be discharged into a reclaimed water tank for recycling.
In this embodiment, the salt separation unit 4 includes a first stage nanofiltration device 41, a first crystallizer 42, a first multi-medium filtration device 43, a first ultrafiltration device 44 and a second stage nanofiltration device 45, and the output end of the crystallization pretreatment unit 3 is connected to the first stage nanofiltration device 41 of the salt separation unit 4; the concentrated solution discharged from the crystallization pretreatment unit sequentially passes through a first-stage nanofiltration device 41, a first crystallizer 42, a first multi-medium filtration device 43, a first ultrafiltration device 44 and a second-stage nanofiltration device 45 of the salt separation unit 4 to separate nanofiltration product water and nanofiltration concentrated water, wherein the nanofiltration product water is mainly concentrated solution containing sodium chloride, and the nanofiltration concentrated water is mainly concentrated solution containing calcium chloride.
In the specific implementation process, the first-stage nanofiltration device 41, the first crystallizer 42, the first multi-medium filtration device 43, the first ultrafiltration device 44 and the second-stage nanofiltration device 45 are connected in sequence through pipelines, the concentrated solution is separated by the first-stage nanofiltration device 41 to generate high-quality reclaimed water, the high-quality reclaimed water generated by the second part can be converged with the high-quality reclaimed water generated by the reduction unit 2 and discharged into a reclaimed water tank for recycling, the rest concentrated solution enters the first crystallizer 42 through an intermediate water tank, a medicament is added into the first crystallizer to reduce the hardness, calcium sulfate crystal slurry is generated, calcium sulfate crystals with the purity of more than 95% can be formed after dehydration, and the calcium sulfate crystals can be used as building materials and cement raw materials. The water outlet end of the first crystallizer 42 is sequentially connected with a first multi-medium filtering device 43 and a first ultrafiltration device 44, the water quality requirement of nanofiltration water is met while tiny suspended crystals in water are removed, the water outlet end of the first ultrafiltration device 44 is connected with a second nanofiltration device 45, the produced water separated by the second nanofiltration device 45 is connected with a first evaporation crystallization unit 5, the concentrated water separated by the second nanofiltration device 45 is connected with a second evaporation crystallization unit 6, and finally different recycling crystal salts can be extracted by evaporation crystallization in a separation mode, and meanwhile high-quality reclaimed water is produced.
According to the high-mineral mine drainage water recycling treatment system, firstly, suspended matters, colloid, hardness and impurities in water are primarily removed through the pretreatment unit, the quality of incoming water of the subsequent treatment unit is improved, then the output end of the pretreatment unit is connected with the reduction unit, the pretreated water is further filtered and purified, the desalination of high-concentration saline water is realized, and high-quality reclaimed water is obtained; secondly, concentrating and filtering by a crystallization pretreatment unit, and further removing suspended matters in concentrated liquid water; thirdly, the output end of the crystallization pretreatment unit is connected with a first-stage nanofiltration device of the salt separation unit, high-quality reclaimed water is generated after the first-stage nanofiltration device is separated, and then the residual concentrated solution sequentially passes through a first crystallizer, a first multi-medium filtration device, a first ultrafiltration device and a second-stage nanofiltration device to finally realize the effects of permanent hardness removal and 90% separation of sodium ions and calcium ions; finally, the nanofiltration product water and the nanofiltration concentrated water are respectively connected into the first evaporation crystallization unit and the second evaporation crystallization unit, so that the recycling of the high-quality reclaimed water is realized, the salt separation extraction of sodium chloride and calcium chloride which have economic values and can be directly sold as industrial products is realized, and the recycling rate of the high-quality reclaimed water and the recycling efficiency of crystal salt are improved. In each processing unit, the dosage of the medicament and the output of solid waste are greatly reduced, each resource substance is separated out with the lowest energy consumption, and the system reliability and the running cost of the recycling of the mine drainage water of the type are greatly improved.
In this embodiment, the first stage nanofiltration device 41 is a positively charged nanofiltration membrane, and the flux of the positively charged nanofiltration membrane is 20 to 30MLH. The separation characteristic of the positively charged nanofiltration membrane is determined by both the charge effect and the pore size sieving effect of the membrane surface. The nanofiltration membrane is a pressure-driven membrane, has interception performance between ultrafiltration and reverse osmosis, has obvious advantages in separating high-valence inorganic salt and macromolecular organic matters, can operate in a low-pressure state compared with a reverse osmosis membrane while separating ions in different valence states, and has important significance in membrane pollution control, energy conservation and consumption reduction.
The positively charged nanofiltration membrane is applied to the high mineral mine drainage water recycling treatment system, and the flux of the positively charged nanofiltration membrane is controlled to be 20-30 MLH, the pH value of the inlet water is 7.5-8.5, so that the charge effect has a greater influence on the separation performance of the nanofiltration membrane, and the separation efficiency of 90% of sodium ions and calcium ions is realized.
Specifically, the primary nanofiltration device 41 separates a divalent salt, and calcium ions and sulfate ions are enriched on the concentrate side, the main anions on the fresh side are monovalent anions, and the fresh water recovery rate is about 75%. Of course, the secondary nanofiltration device 45 can also select positively charged nanofiltration membranes, calcium ions, sulfate ions and chloride ions are enriched on the concentrated water side, and the main anions on the fresh water side are monovalent anions, so that preliminary salt separation is completed. It will be appreciated that the primary nanofiltration device 41 and the secondary nanofiltration device 45 may be other treatment devices with separation effects, as long as ions of different valence states can be separated.
In other embodiments, the second crystallizer 46 is connected to the water outlet end of the secondary nanofiltration device 45, and calcium sulfate crystals with purity of 95% or more can be precipitated after the hardness is reduced by the second crystallizer 46. In the salt separation unit, when the first crystallizer 42 fails or is blocked by crystal products, the precipitate of the first crystallizer 42 is reduced, which will reduce the recovery rate of the recycled products, and the second crystallizer 46 is added after the secondary nanofiltration device 45, so that the precipitation of calcium sulfate crystals can be further ensured, and the stability of the system operation is improved.
As shown in fig. 5, a scale inhibitor is put into the first nanofiltration device 41, and a monitoring device is provided to monitor the amount of the put scale inhibitor. The scale inhibitor can prevent calcium sulfate from scaling, and meanwhile, the monitoring device is arranged, so that the input amount of the scale inhibitor can be monitored in real time, and the sufficient scale inhibitor can be added in time in the stage of first-stage nanofiltration. It will be appreciated that in order to prevent scaling, a scale inhibitor may also be put into the secondary nanofiltration device 45 and monitoring means provided to ensure stable operation of the salt separation unit 4. Of course, it will be appreciated that other agents may be added to the primary 41 and secondary 45 nanofiltration devices as long as they prevent scaling and facilitate the extraction of the recycled product.
In this embodiment, the chemical added into the first crystallizer 42 is an inducing chemical and a flocculant, and the supersaturation curve of the incoming water is adjusted to precipitate supersaturated calcium sulfate crystals, and sodium carbonate is not added to remove hardness, so as to increase precipitation of calcium sulfate crystals and avoid introducing other impurities. Of course, it will be appreciated that in other embodiments, other agents may be added, particularly in accordance with the composition of the mine drainage water, as long as the maximum extraction of the recycled product is met and no other impurities are introduced.
As shown in fig. 2, the pretreatment unit 1 includes an aeration tank 11, a coagulating sedimentation tank 12 and a second multi-medium filtering device 13, the aeration tank 11, the coagulating sedimentation tank 12 and the second multi-medium filtering device 13 are sequentially connected through pipelines, mine drainage water sequentially passes through the aeration tank 11, the coagulating sedimentation tank 12 and the second multi-medium filtering device 13, a coagulating agent is added into the coagulating sedimentation tank 12 to precipitate impurities in a water body, calcium hydroxide can be added in the embodiment, the PH of the water body is adjusted to be alkaline, thereby ensuring that most of calcium sulfate and magnesium hydroxide are removed in a precipitation manner, the impurity content after crystallization is not increased, a mud beating device can be additionally arranged in the coagulating sedimentation stage to discharge the precipitate, the suspended solids, colloid and large-particle suspended solids in the water body are removed by the second multi-medium filtering device 13, the hardness is reduced at the same time, and the output end of the second multi-medium filtering device 13 is connected into the reduction unit 2 to provide water for the reduction unit 2.
As shown in fig. 3, the reduction unit 2 includes a second ultrafiltration device 21 and a first reverse osmosis device 22, the concentrated solution produced by the second multi-medium filtration device 13 is further filtered and purified by the second ultrafiltration device 21 to meet the water quality requirement of the reverse osmosis water, the filtered and purified produced water is connected to the first reverse osmosis device 22, and the produced water can produce high-quality reclaimed water which is not less than 70% as reclaimed water after being filtered by the first reverse osmosis device 22, and meanwhile, a medicament is added into the first reverse osmosis device 22 to improve the reuse rate of the reclaimed water and prevent the reverse osmosis device from blocking. The output end of the pretreatment unit 1, namely the output end of the second multi-medium filter device 13, is connected to the second ultrafiltration device 21, and the output end of the first reverse osmosis device 22 is connected to the crystallization pretreatment unit 3.
As shown in fig. 4, the crystallization pretreatment unit 3 includes a high-efficiency clarifier 31, a third multi-medium filter 32 and a third ultrafiltration device 33, the high-efficiency clarifier 31, the third multi-medium filter 32 and the third ultrafiltration device 33 are sequentially connected in pipeline, the output end of the reduction unit 2, i.e. the output end of the first reverse osmosis device 22, is connected to the high-efficiency clarifier 31, and simultaneously, a coagulating agent is added to the high-efficiency clarifier 31 to remove temporary alkalinity, magnesium ions and the like in water, and further, a sludge discharge device can be additionally arranged at the coagulating sedimentation stage to discharge sediment. In this embodiment, the high-efficiency clarifier 31 removes temporary alkalinity, magnesium ions and the like in water by using a lime method, specifically, calcium hydroxide can be put into the high-efficiency clarifier 31, so that the use of sodium carbonate agents is saved, the added calcium ions can be converted into calcium sulfate and calcium chloride products at the same time, and in the crystallization pretreatment unit 3, not only temporary hardness and magnesium ions are removed, but also the yield of the subsequent precipitated crystals is improved. The water body precipitated by the high-efficiency clarification tank 31 sequentially passes through a third multi-medium filtering device 32 and a third ultrafiltration device 33, so that suspended matters and other impurities in the water body are further removed, and water is supplied to the subsequent salt separation unit 4. The output end of the third ultrafiltration device 33 is connected to a first-stage nanofiltration device 41 of the salt separation unit 4, and the concentrated solution is subjected to further salt separation treatment by the salt separation unit 4.
As shown in fig. 6, the first evaporative crystallization unit 5 includes a second reverse osmosis device 51, a first high-density tank 52, a fourth multi-medium filtration device 53, a first solar concentration tank 55, a second high-density tank 56 and a first evaporative crystallizer 54, the water producing end of the second nanofiltration device 45 is connected to the second reverse osmosis device 51, and the produced water of the second nanofiltration device 45 is further concentrated by the second reverse osmosis device 51 to produce high-quality reclaimed water, which can be used as a reclaimed water pool for reuse after being further concentrated by the second reverse osmosis device 51, and of course, it is understood that a scale inhibitor can be added into the second reverse osmosis device 51 to improve the quality of the reclaimed water, and the high-quality reclaimed water is a third portion and can be merged with the high-quality reclaimed water produced in the reduction unit 2 and the salt separation unit 4 and discharged into the reclaimed water pool for reuse. The remaining concentrated solution passes through the first high-density tank 52, the fourth multi-medium filter 53, the first solar concentration tank 55, the second high-density tank 56 and the first evaporation crystallizer 54 in sequence to generate high-quality sodium chloride crystals.
In this embodiment, the first high-density tank 52 may be filled with a chemical to remove hardness, specifically, sodium hydroxide and sodium carbonate may be filled into the first high-density tank 52 to remove hardness, so as to avoid adding excessive impurities, the water after hardness removal enters the fourth multi-medium filter 53 to remove tiny crystals which are difficult to settle, and then enters the first evaporation crystallizer 54 through the first solar concentration tank 55 and the second high-density tank 56, at this time, the concentration of sodium chloride reaches more than 20%, and sodium chloride crystals are obtained after evaporation crystallization through the first evaporation crystallizer 54, and can be used for recovery.
As shown in fig. 7, the second evaporative crystallization unit 6 includes a third crystallizer 61, a third high-density tank 62, a fifth multi-medium filter 63, a second solar concentration tank 67, a fourth high-density tank 68, a second evaporative crystallizer 64, a multi-effect evaporation device 65 and a drying device 66, the concentrated water of the second nanofiltration device 45 is introduced into the third crystallizer 61, and calcium sulfate crystals are further precipitated after the concentrated water of the second nanofiltration device 45 is crystallized by the third crystallizer 61, so that the sulfate removal rate is more than 90%. The residual concentrated solution sequentially passes through a third high-density tank 62, a fifth multi-medium filtering device 63, a second solar concentration tank 67, a fourth high-density tank 68 and a second evaporation crystallizer 64 to generate liquid calcium chloride, in the embodiment, a medicament can be added into the third high-density tank 62 to remove hardness, the water body after hardness removal enters the fifth multi-medium filtering device 63 to remove micro crystals, and then the effluent water after precipitation in the second solar concentration tank 67 and the fourth high-density tank 68 enters the second evaporation crystallizer 64 to generate concentrated 30% liquid calcium chloride, wherein the liquid calcium chloride only contains a small amount of sodium chloride, can reach the industrial standard of calcium chloride solution and can be directly sold. The liquid calcium chloride is an important refrigerant for a refrigerator and ice making, can accelerate concrete hardening, and is a good building antifreezing agent. The liquid calcium chloride water tank can be used as flow regulation, the outlet is sequentially connected with a multi-effect evaporation device 65 and a drying device 66, and calcium chloride crystals are separated out after drying and evaporation. The granular calcium chloride dihydrate solid can be separated out in the embodiment, has multiple purposes, such as a drying agent, a pavement dust collector and a harbor antifogging agent, can also be used as a snow melting agent, an antifreezing solution, a refrigerant, a fire extinguishing agent and the like, is also used as a raw material for manufacturing calcium salt, can be used for various industrial production, has high demand and high value, and is beneficial to sales.
The high-mineral mine drainage water recycling treatment system provided by the invention not only realizes the recycling of high-quality reclaimed water, but also realizes the salt separation extraction of sodium chloride and calcium chloride, and improves the recycling rate of high-quality reclaimed water and the extraction of recycled crystal salt.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The high mineral mine drainage water recycling treatment system is characterized by comprising a pretreatment unit (1), a reduction unit (2), a crystallization pretreatment unit (3), a salt separation unit (4), a first evaporation crystallization unit (5) and a second evaporation crystallization unit (6);
the output end of the pretreatment unit (1) is connected with the reduction unit (2), and the concentrated solution generated by the reduction unit (2) is connected with the crystallization pretreatment unit (3);
the salt separation unit (4) comprises a first-stage nanofiltration device (41), a first crystallizer (42), a first multi-medium filtration device (43), a first ultrafiltration device (44) and a second-stage nanofiltration device (45), and the output end of the crystallization pretreatment unit (3) is connected to the first-stage nanofiltration device (41) of the salt separation unit (4);
the primary nanofiltration device (41), the first crystallizer (42), the first multi-medium filtering device (43), the first ultrafiltration device (44) and the second nanofiltration device (45) are connected through pipelines in sequence, concentrated solution is separated by the primary nanofiltration device (41) to generate high-quality reclaimed water, the residual concentrated solution enters the first crystallizer (42), the hardness of the residual concentrated solution can be reduced after adding a medicament to generate calcium sulfate crystals, the water outlet end of the first crystallizer (42) is sequentially connected with the first multi-medium filtering device (43) and the first ultrafiltration device (44), the water outlet end of the first ultrafiltration device (44) is connected with the second nanofiltration device (45), the produced water separated by the second nanofiltration device (45) is connected with the first evaporation crystallization unit (5), and the concentrated water separated by the second nanofiltration device (45) is connected with the second evaporation crystallization unit (6); the medicament added into the first crystallizer (42) is an induction medicament and a flocculating agent so as to increase precipitation of calcium sulfate crystals and avoid introducing other impurities; the primary nanofiltration device (41) is a positively charged nanofiltration membrane, the flux of the positively charged nanofiltration membrane is 20-30 MLH, and the nanofiltration membrane is a pressure driven membrane; a second crystallizer (46) is connected to the water outlet end of the secondary nanofiltration device (45), and calcium sulfate crystals with purity reaching more than 95% can be separated out after the hardness is reduced by the second crystallizer (46); the first evaporation crystallization unit (5) comprises a second reverse osmosis device (51), a first high-density tank (52), a fourth multi-medium filtering device (53), a first solar concentration tank (55), a second high-density tank (56) and a first evaporation crystallizer (54), wherein the water producing end of the second nano-filtration device (45) is connected with the second reverse osmosis device (51), the water produced by the second nano-filtration device (45) can be further concentrated by the second reverse osmosis device (51) to generate high-quality reclaimed water, and the residual concentrated solution sequentially passes through the first high-density tank (52), the fourth multi-medium filtering device (53), the first solar concentration tank (55), the second high-density tank (56) and the first evaporation crystallizer (54) to generate high-quality sodium chloride crystals; the second evaporation crystallization unit (6) comprises a third crystallizer (61), a third high-density tank (62), a fifth multi-medium filtering device (63), a second solar concentration tank (67), a fourth high-density tank (68), a second evaporation crystallizer (64), a multi-effect evaporation device (65) and a drying device (66), the concentrated water end of the second-level nanofiltration device (45) is connected into the third crystallizer (61), calcium sulfate crystals can be generated after the concentrated water of the second-level nanofiltration device (45) is crystallized by the third crystallizer (61), the residual concentrated solution sequentially passes through the third high-density tank (62), the fifth multi-medium filtering device (63), the second solar concentration tank (67), the fourth high-density tank (68) and the second evaporation crystallizer (64) are then subjected to liquid calcium chloride, and the liquid calcium chloride sequentially passes through the multi-effect evaporation device (65) and the drying device (66) to precipitate the calcium chloride crystals.
2. The high mineral mine drainage water recycling treatment system according to claim 1, wherein a scale inhibitor is put into the primary nanofiltration device (41) and the secondary nanofiltration device (45), and a monitoring device is provided to monitor the amount of the scale inhibitor put.
3. The high mineral mine drainage water recycling treatment system according to claim 1, wherein the pretreatment unit (1) comprises an aeration tank (11), a coagulating sedimentation tank (12) and a second multi-medium filtering device (13), the aeration tank (11), the coagulating sedimentation tank (12) and the second multi-medium filtering device (13) are sequentially connected in a pipeline manner, and the output end of the second multi-medium filtering device (13) is connected into the reduction unit (2).
4. The high mineral mine drainage water recycling treatment system according to claim 1, wherein the reduction unit (2) comprises a second ultrafiltration device (21) and a first reverse osmosis device (22), the water producing end of the second ultrafiltration device (21) is connected with the first reverse osmosis device (22), high-quality reclaimed water can be produced after the produced water is filtered by the first reverse osmosis device (22), the output end of the pretreatment unit (1) is connected with the second ultrafiltration device (21), and the output end of the first reverse osmosis device (22) is connected with the crystallization pretreatment unit (3).
5. The high mineral mine drainage water recycling treatment system according to claim 1, wherein the crystallization pretreatment unit (3) comprises a high-efficiency clarification tank (31), a third multi-medium filtering device (32) and a third ultrafiltration device (33), the high-efficiency clarification tank (31), the third multi-medium filtering device (32) and the third ultrafiltration device (33) are sequentially connected in a pipeline mode, the output end of the reduction unit (2) is connected into the high-efficiency clarification tank (31), the output end of the third ultrafiltration device (33) is connected into the first-stage nanofiltration device (41) of the salt separation unit (4), and calcium hydroxide is put into the high-efficiency clarification tank (31) to remove impurities in water and improve the precipitation amount of recycled crystals.
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