CN215975042U - Tombarthite waste water evaporation treatment device - Google Patents
Tombarthite waste water evaporation treatment device Download PDFInfo
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- CN215975042U CN215975042U CN202121311532.9U CN202121311532U CN215975042U CN 215975042 U CN215975042 U CN 215975042U CN 202121311532 U CN202121311532 U CN 202121311532U CN 215975042 U CN215975042 U CN 215975042U
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- Prior art keywords
- effect evaporator
- rare earth
- evaporator
- heat exchanger
- conveying
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- 239000002351 wastewater Substances 0.000 title claims abstract description 31
- 238000001704 evaporation Methods 0.000 title claims abstract description 24
- 230000008020 evaporation Effects 0.000 title claims abstract description 23
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 23
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 6
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 36
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 26
- 238000002425 crystallisation Methods 0.000 claims description 23
- 230000008025 crystallization Effects 0.000 claims description 23
- 239000013078 crystal Substances 0.000 claims description 21
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 18
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 18
- 239000012452 mother liquor Substances 0.000 claims description 15
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 2
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The utility model discloses a rare earth wastewater evaporation treatment device which comprises an evaporator water storage tank, a heat exchanger, a two-effect evaporator, an MVR (mechanical vapor recompression) pump and a one-effect evaporator; the MVR compression pump is connected with the second-effect evaporator and the first-effect evaporator; the second-effect evaporator and the first-effect evaporator are connected through a material pump and are used for conveying the waste water evaporated by the second-effect evaporator to the first-effect evaporator for secondary evaporation; the shell passes of the second-effect evaporator and the first-effect evaporator are respectively connected with the heat exchanger and used for conveying a heat exchange medium to the heat exchanger to preheat the rare earth wastewater. This evaporation plant utilizes MVR compression technology make full use of secondary steam's energy, only needs to supply a small amount of primary steam to utilize preheating of evaporimeter condensate to preheat waste water, realized the reuse of energy, reduced the consumption.
Description
Technical Field
The utility model belongs to the field of water pollution treatment of environmental engineering, and particularly relates to a rare earth wastewater evaporation treatment device.
Background
Rare earth is a non-renewable important strategic resource, has great influence on national safety and national economic development, and is increasingly widely applied to various departments of national economy. Through development for many years, the rare earth industry in China is continuously enlarged, the problem of environmental pollution in the rare earth production process is increasingly prominent, the healthy development of the industry is seriously influenced, the huge environmental pollution is always an unsolved soft rib, and the environmental protection problem is gradually raised to the core of the development of the industry.
At present, the methods adopted by various processes for treating the rare earth smelting magnesium sulfate wastewater at home and abroad are summarized as a chemical method, an ion exchange method, a distillation concentration method, a membrane technology treatment method and the like. The methods play a good role in treating rare earth smelting, but have the defects of complex structure, large investment, large occupied area, high operating cost, high energy consumption, difficult maintenance and operation, poor sewage purification effect, discharge after reaching the standard, incapability of recycling water and other resources, incapability of achieving final treatment, incapability of recycling magnesium sulfate and magnesium chloride and the like to different degrees.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a rare earth wastewater evaporation treatment device which is used for carrying out high-efficiency evaporation concentration treatment on pretreated rare earth wastewater and facilitating subsequent crystallization and separation of magnesium sulfate and magnesium chloride.
The rare earth wastewater evaporation treatment device comprises an evaporator water storage tank, a heat exchanger, a two-effect evaporator, an MVR (mechanical Vapor recompression) compression pump and a one-effect evaporator;
the MVR compression pump is connected between the second-effect evaporator and the first-effect evaporator and used for pressurizing and heating secondary steam and then conveying the secondary steam to the shell pass of the first-effect evaporator, and the secondary steam generated by the first-effect evaporator returns to the shell pass of the second-effect evaporator; the second-effect evaporator and the first-effect evaporator are connected through a material pump and are used for conveying the waste water evaporated by the second-effect evaporator to the first-effect evaporator for secondary evaporation; the shell passes of the second-effect evaporator and the first-effect evaporator are respectively connected with the heat exchanger and used for conveying a heat exchange medium to the heat exchanger to preheat the rare earth wastewater.
Under the specific condition, the device also comprises a seed crystal pool and a stirring tank, wherein the heat exchanger and the seed crystal pool are respectively connected with the stirring tank, and the stirring tank is connected with the double-effect evaporator. The ratio of magnesium sulfate to magnesium chloride at the end of evaporation is adjusted by adding seed crystals, which is beneficial to subsequent crystallization and separation.
Preferably, the device also comprises a crystallization and separation device which is used for receiving the concentrated wastewater of the one-effect evaporator and carrying out crystallization and separation. The crystallization and separation device comprises a magnesium sulfate crystallization device, a filtering device, a mother liquor concentration device and a magnesium chloride crystallization device which are connected in sequence. The magnesium sulfate crystallization device comprises a flash evaporation device and a crystal growth device which are connected in series. And (3) conveying the magnesium sulfate-containing crystal material in the magnesium sulfate crystallization device to a filtering device through a conveying pump for filtering, conveying the filtered magnesium sulfate heptahydrate crystal to a drying device for drying, and packaging to serve as a product for sale. And (3) the filtered mother liquor mainly contains magnesium sulfate and magnesium chloride, and the mother liquor is sent to a mother liquor concentration device to separate most of magnesium sulfate, and then the evaporated water is pumped into a magnesium chloride crystallization device again to produce scraping magnesium chloride. The mother liquor concentration device is connected with the seed crystal pool, and the bottom sediment of the mother liquor concentration device is returned to the seed crystal pool to be used as seed crystal.
Compared with the prior art, the utility model has the beneficial effects that:
this evaporation plant utilizes MVR compression technology make full use of secondary steam's energy, only needs to supply a small amount of primary steam to utilize preheating of evaporimeter condensate to preheat waste water, realized the reuse of energy, reduced the consumption. The final treated effluent of the device can reach the first-grade standard of sewage comprehensive discharge, and no secondary pollution is caused to the environment in the treatment process. And the magnesium sulfate and the magnesium chloride in the wastewater can be recovered.
Drawings
FIG. 1 is a schematic structural diagram of the rare earth wastewater evaporative concentration device of the present invention.
Description of reference numerals:
1. the device comprises an evaporator water storage tank, 2 a heat exchanger, 3 a seed crystal pool, 4 a stirring tank, 5 a double-effect evaporator, 6 an MVR compressor, 7 a single-effect evaporator, 8 a crystallization device, 9 and a separation device.
Detailed Description
The utility model is further explained below with reference to the drawings and examples. Advantages and features of the present invention will become more apparent as the description proceeds, but the examples are exemplary only, and do not limit the scope of the present invention in any way. The devices or components used in the embodiments may take any conventional construction known in the art, unless otherwise specified.
Referring to fig. 1, the rare earth wastewater evaporation and concentration device of the utility model comprises an evaporator water storage tank 1, a heat exchanger 2, a seed crystal tank 3, a stirring tank 4, a two-effect evaporator 5, an MVR compression pump 6, a one-effect evaporator 7, a crystallization device 8 and a separation device 9.
The evaporator water storage tank 1 is used for receiving the pretreated rare earth wastewater, the evaporator water storage tank 1 is connected with the heat exchanger 2 through a pump, the heat exchanger 2 is connected with the stirring tank 4 through a pump, and the seed crystal pool 3 is also connected with the stirring tank 4. The preheated rare earth wastewater and the added seed crystal are uniformly mixed in the stirring tank 4 and then enter the MVR evaporation unit.
The MVR evaporation unit mainly comprises a two-effect evaporator 5, an MVR compression pump 6 and a one-effect evaporator 7. The second-effect evaporator 5 and the first-effect evaporator 7 both adopt a tube-shell indirect heat exchange mode, wastewater flows through a tube side, and a heat exchange medium (water vapor) flows through a shell side. The MVR compression pump 6 is connected between the second-effect evaporator 5 and the first-effect evaporator 7 and is used for pressurizing and heating secondary steam generated by the second-effect evaporator 5 and then conveying the secondary steam to the shell pass of the first-effect evaporator 7, and the secondary steam generated by the first-effect evaporator 7 returns to the shell pass of the second-effect evaporator 5; the second-effect evaporator 5 and the first-effect evaporator 7 are also connected through a material pump and are used for conveying the waste water evaporated by the second-effect evaporator 5 to the first-effect evaporator 7 for re-evaporation; the shell passes of the second-effect evaporator 5 and the first-effect evaporator 7 are respectively connected with the heat exchanger 2 and used for conveying the steam condensate to the heat exchanger 2 to preheat the rare earth wastewater.
The crystallization and separation device comprises a magnesium sulfate crystallization device, a filtering device, a mother liquor concentration device and a magnesium chloride crystallization device which are connected in sequence. The magnesium sulfate crystallization device comprises a flash evaporation device and a crystal growth device which are connected in series. And (3) conveying the magnesium sulfate-containing crystal material in the magnesium sulfate crystallization device to a filtering device through a conveying pump for filtering, conveying the filtered magnesium sulfate heptahydrate crystal to a drying device for drying, and packaging to serve as a product for sale. And (3) the filtered mother liquor mainly contains magnesium sulfate and magnesium chloride, and the mother liquor is sent to a mother liquor concentration device to separate most of magnesium sulfate, and then the evaporated water is pumped into a magnesium chloride crystallization device again to produce scraping magnesium chloride. The mother liquor concentration device is connected with the seed crystal pool, and the bottom sediment of the mother liquor concentration device is returned to the seed crystal pool to be used as seed crystal.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (5)
1. A rare earth wastewater evaporation treatment device is characterized by comprising an evaporator water storage tank, a heat exchanger, a two-effect evaporator, an MVR compression pump and a one-effect evaporator;
the MVR compression pump is connected with the second-effect evaporator and the first-effect evaporator and is used for pressurizing and heating secondary steam and then conveying the secondary steam to the shell pass of the first-effect evaporator, and the secondary steam generated by the first-effect evaporator returns to the shell pass of the second-effect evaporator; the second-effect evaporator and the first-effect evaporator are connected through a material pump and are used for conveying the waste water evaporated by the second-effect evaporator to the first-effect evaporator for secondary evaporation; the shell passes of the second-effect evaporator and the first-effect evaporator are respectively connected with the heat exchanger and used for conveying a heat exchange medium to the heat exchanger to preheat the rare earth wastewater.
2. The rare earth wastewater evaporation treatment device according to claim 1, further comprising a seed crystal pool and a stirring tank, wherein the heat exchanger and the seed crystal pool are respectively connected with the stirring tank, and the stirring tank is connected with the double-effect evaporator.
3. The rare earth wastewater evaporation treatment device according to claim 2, further comprising a crystallization and separation device for receiving the concentrated wastewater from the single-effect evaporator and performing crystallization and separation.
4. The rare earth wastewater evaporation treatment device according to claim 3, wherein the crystallization and separation device comprises a magnesium sulfate crystallization device, a filtration device, a mother liquor concentration device and a magnesium chloride crystallization device which are connected in sequence.
5. The rare earth wastewater evaporation treatment device according to claim 4, wherein the mother liquor concentration device is connected with the seed tank, and the bottom sediment of the mother liquor concentration device is returned to the seed tank to be used as the seed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311532.9U CN215975042U (en) | 2021-06-11 | 2021-06-11 | Tombarthite waste water evaporation treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311532.9U CN215975042U (en) | 2021-06-11 | 2021-06-11 | Tombarthite waste water evaporation treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215975042U true CN215975042U (en) | 2022-03-08 |
Family
ID=80516859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121311532.9U Active CN215975042U (en) | 2021-06-11 | 2021-06-11 | Tombarthite waste water evaporation treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215975042U (en) |
-
2021
- 2021-06-11 CN CN202121311532.9U patent/CN215975042U/en active Active
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| GR01 | Patent grant | ||
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Address after: 061000 Floor 5, R&D Building, No. 9, Guofeng Avenue, High tech Zone, Cangzhou City, Hebei Province Patentee after: Hebei Fengyuan Environmental Protection Technology Group Co.,Ltd. Address before: 061000 south of No.1 Road, Zhongjie Industrial Park, Cangzhou City, Hebei Province Patentee before: HEBEI FENGYUAN GREEN TECHNOLOGY Inc. |
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Address after: 010000 West Wanda Sales Center, Genghis Khan West Street, Huimin District, Hohhot City, Inner Mongolia Autonomous Region Patentee after: Antai Fengyuan Environmental Protection Technology (Inner Mongolia) Group Co.,Ltd. Country or region after: China Address before: 061000 Floor 5, R&D Building, No. 9, Guofeng Avenue, High tech Zone, Cangzhou City, Hebei Province Patentee before: Hebei Fengyuan Environmental Protection Technology Group Co.,Ltd. Country or region before: China |