CN218931904U - Device for recycling phosphorus chemical wastewater - Google Patents
Device for recycling phosphorus chemical wastewater Download PDFInfo
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- CN218931904U CN218931904U CN202320037516.8U CN202320037516U CN218931904U CN 218931904 U CN218931904 U CN 218931904U CN 202320037516 U CN202320037516 U CN 202320037516U CN 218931904 U CN218931904 U CN 218931904U
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Abstract
The utility model provides a device for recycling phosphorus chemical wastewater, which consists of a reaction precipitation unit, a freezing crystallization unit and a membrane separation unit, wherein the reaction precipitation unit comprises a lime milk pulping tank, a phosphorus fluorine reaction tank, a phosphorus fluorine sedimentation tank, a phosphorus fluorine mixed salt filter and other components, phosphorus and fluorine in the phosphorus chemical wastewater react with lime to generate phosphorus and fluorine mixed salt, the phosphorus and fluorine mixed salt is filtered and discharged, the obtained primary clear liquid is treated by an integrated freezing crystallization separator, an ice melting tank, a calcium magnesium sodium mixed salt filter and the like in the freezing crystallization unit, calcium magnesium sodium mixed salt is separated out, light salt water is converted into ice and calcium magnesium sodium mixed salt to be separated, the calcium magnesium sodium mixed salt is filtered and separated out, and the light salt water is finally circularly treated by a reverse osmosis membrane group in the membrane separation unit to obtain industrial reuse water. The utility model realizes the reclamation of the phosphate and fluoride in the phosphorus chemical wastewater, simultaneously recycles the water resources in the wastewater as industrial reuse water, realizes the zero discharge of waste liquid and realizes the double-effect of environmental protection and economy.
Description
Technical Field
The utility model belongs to the technical field of environmental protection technology, namely wastewater treatment, and particularly relates to a process and a device for recycling phosphorus chemical wastewater.
Background
The phosphate ore is a mineral resource with strategic significance, and the downstream industry mainly comprises phosphate fertilizer, pesticide, phosphate, phosphoric acid and the like, and is widely applied to industries of agriculture, food, flame retardant, detergent, electronics and the like; at present, the phosphate rock of China has a exploring reserve of about 32 hundred million tons and a capacity of about 8500 ten thousand tons per year, and the phosphate rock is taken as a non-renewable resource, and can be continuously developed and utilized, so that the grain safety, the production and the life are directly related.
Phosphate ores mined from nature contain a large amount of impurities, so that phosphate ores need to be washed and selected before products are produced from the phosphate ores, and a large amount of washing and selecting wastewater containing phosphorus and fluorine is associated. A large amount of phosphogypsum is also produced as a byproduct in the production process of the phosphorus chemical product, and a large amount of phosphogypsum percolate is produced. In addition, a large amount of other phosphorus-containing wastewater can be generated in the phosphorus chemical industry chain. Because of the material characteristics of the phosphate ore and the characteristics of the phosphorus chemical process, the common phosphorus chemical wastewater contains a large amount of phosphorus, fluorine, acid and other pollutants, and if the pollutants are directly discharged into the environment, huge ecological disasters can be brought. Therefore, effective treatment of phosphorus chemical wastewater is imperative.
The conventional process for treating the phosphorus chemical wastewater adopts a lime precipitation method. Namely: lime is directly added into the wastewater of the phosphorus chemical industry, and because the pollutants such as phosphorus, fluorine and the like and calcium are reacted and combined into precipitate, the lime has alkalinity, and meanwhile, the acid in the wastewater is neutralized, so that all indexes of the wastewater can reach the standard and be discharged. The chemical reactions that occur are as follows:
H + + Ca(OH) 2 →Ca 2+ +H 2 O，
Ca 2+ +PO 4 3- →Ca 3 (PO 4 )↓，
Ca 2+ +F - →CaF 2 ↓。
chinese patent CN102328984a discloses a method for treating wastewater of phosphorus chemical industry, which comprises mixing acidic wastewater of titanium dioxide industry of sulfuric acid method with wastewater of phosphorus chemical industry, adding lime milk or carbide slag to neutralize, settling reaction system, and separating solid from liquid to obtain wastewater reaching discharge standard; chinese patent CN105254073a discloses a system for treating and recycling wastewater of phosphorus chemical industry and its realization method, wherein the wastewater of phosphorus chemical industry is obtained by steps of lime neutralization, flocculation, precipitation, chemical dephosphorization, etc., and reaches the discharge standard; chinese patent CN102690000A discloses a method for recycling phosphorus in phosphorus chemical water by a struvite production process, which comprises the steps of removing inorganic fluoride ions in the phosphorus chemical wastewater by a quicklime method after preliminary sedimentation and separation, removing inorganic cations by a cation exchange method, and finally preparing phosphatase particle waste in a struvite reactor from the obtained wastewater, wherein effluent from struvite reaction can be discharged directly up to the standard.
Due to calcium hydroxide (Ca (OH) 2 ) The phosphorus and fluorine in the final produced water can reach the standard, the pH value of the reaction needs to be controlled to be more than 10, so that a lot of lime is required to be added, and the finally produced phosphorus and fluorine slag also contains a lot of unreacted limeThereby bringing about a problem of large slag yield. In addition, as unreacted lime is mixed into the phosphorus-fluorine waste slag, the generated alkaline phosphorus-fluorine waste slag cannot be directly recycled into production, the formed alkaline hazardous waste also needs to be further treated, and if the alkaline hazardous waste slag is backfilled into a landfill, pollutants can be gradually enriched in the system, so that a huge risk is brought to a treatment system. Meanwhile, the water still contains a large amount of calcium, magnesium and sodium ions, and although the phosphorus, fluorine and other pollutants are removed, the salt content is high, the water still cannot be recycled and produced, and part of the salt water can only be discharged, so that the traditional process not only causes a large amount of waste of water resources, but also brings a large amount of salt to natural water. In conclusion, the traditional process for treating the phosphorus chemical wastewater can ensure that the water quality reaches the standard and is discharged, but has the problems of high treatment cost, incapability of effectively recycling phosphorus and fluorine resources, large yield of dangerous waste slag, water resource waste, environment friendliness and the like.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a device for recycling phosphorus chemical wastewater, which can separate and recycle phosphorus fluorine mixed salt and calcium magnesium sodium mixed salt generated in the treatment process of the phosphorus chemical wastewater and form recyclable water resources.
The technical scheme adopted by the utility model is as follows:
the utility model provides a device with phosphorus chemical industry waste water resourceful treatment which characterized in that: the bottom discharge hole of the lime bin is connected with the feed inlet of the lime screw conveyor, the discharge hole of the lime screw conveyor is connected with the feed inlet at the top of the lime milk pulping tank, and the bottom outlet of the lime milk pulping tank is connected with the phosphorus-fluorine reaction tank through the lime milk conveying pump; the slurry outlet of the phosphorus-fluorine reaction tank is connected with the upper inlet of the phosphorus-fluorine sedimentation tank; one side of the phosphorus-fluorine settling tank is provided with a clear liquid outlet which is fixedly connected with a primary clear liquid tank through a pipeline, the primary clear liquid tank is respectively connected with a secondary clear liquid heat exchanger and a reflux concentration mother liquid heat exchanger through a primary clear liquid delivery pump, the secondary clear liquid heat exchanger and the reflux concentration mother liquid heat exchanger are connected with an integrated freezing and crystallizing separator through pipelines, one side upper part of the integrated freezing and crystallizing separator is provided with a floating ice outlet which is connected with an deicing tank, the deicing tank is sequentially connected with the secondary clear liquid tank through a secondary clear liquid delivery pump, the secondary clear liquid heat exchanger and the secondary clear liquid tank, and the secondary clear liquid tank is connected with a reverse osmosis membrane group through a reverse osmosis water inlet pump and a reverse osmosis booster pump.
Preferably, the tops of the lime milk pulping tank and the phosphorus fluorine reaction tank are respectively provided with a phosphorus chemical wastewater inlet, and the inside of the lime milk pulping tank and the phosphorus chemical wastewater inlet is respectively provided with a stirrer for accelerating mixing.
Preferably, the bottom of the phosphorus-fluorine sedimentation tank is provided with a mixed liquid outlet, and the mixed liquid is conveyed into a phosphorus-fluorine mixed salt filter through a phosphorus-fluorine mixed salt slurry conveying pump; the bottom of the phosphorus-fluorine mixed salt filter is provided with a mixed salt outlet for discharging solid matters, and one side of the phosphorus-fluorine mixed salt filter is provided with a clear liquid outlet and is connected with a phosphorus-fluorine settling tank through a pipeline.
Preferably, the lower part of one side of the integrated freezing crystallization separator is connected with a circulating concentrated mother liquor cooler through a concentrated mother liquor delivery pump, and the circulating concentrated mother liquor cooler is connected with an inlet pipeline of one side of the integrated freezing crystallization separator.
Preferably, the integrated freezing crystallization separator is also connected with the cold side inlet of the reflux concentrated mother liquor heat exchanger through a concentrated mother liquor delivery pump, and the cold side outlet of the reflux concentrated mother liquor heat exchanger is connected with the phosphorus-fluorine reaction tank through a pipeline.
Preferably, the bottom of the integrated freezing crystallization separator is connected with a calcium-magnesium-sodium mixed salt filter through a mixed salt delivery pump, a mixed salt outlet is arranged at the bottom of the calcium-magnesium-sodium mixed salt filter to discharge solid matters, and a clear liquid outlet is arranged at one side of the integrated freezing crystallization separator and is connected with the integrated freezing crystallization separator through a pipeline.
Preferably, an automatic ice scraping machine is arranged in the integrated freezing and crystallizing separator, the automatic ice scraping machine processes floating ice generated in the integrated freezing and crystallizing separator and conveys the floating ice to an outlet, and crushed ice is conveyed into the ice melting tank through a pipeline.
Preferably, the deicing tank is also connected with the refrigerating unit through a secondary clear liquid conveying pump, and the secondary clear liquid is conveyed back into the deicing tank from the refrigerating unit after heat exchange and temperature rise in the refrigerating unit.
Further preferably, the refrigerating unit contains a secondary refrigerant, the secondary refrigerant is conveyed into a secondary refrigerant tank through a pipeline after being cooled in the refrigerating unit, the secondary refrigerant tank is connected with a circulating concentrated mother liquor cooler through a secondary refrigerant circulating pump, and the circulating concentrated mother liquor cooler is connected with the refrigerating unit.
Preferably, the bottom of the reverse osmosis membrane group is provided with a concentrated water outlet, and a part of the discharged concentrated water is mixed with water pumped by a reverse osmosis circulating pump and a reverse osmosis booster pump and enters the reverse osmosis membrane group for secondary concentration and separation; the other part is conveyed back to the primary liquid tank through a pipeline for secondary freezing crystallization.
The utility model has the beneficial effects that: the reaction precipitation unit, the freezing crystallization unit and the membrane separation unit are adopted to separate the phosphorus and fluorine in the phosphorus chemical wastewater, so that the waste of phosphorus and fluorine resources is reduced; and calcium and magnesium impurities brought by reaction precipitation are separated through freezing crystallization, so that the risk of scaling and blocking a device by the calcium and magnesium impurities is reduced, and meanwhile, clear liquid obtained after freezing crystallization nitrogen source treatment can be directly used for a membrane separation unit to deeply desalt the clear liquid. In addition, 2 concentrated water reflux units are arranged in the membrane separation unit, so that all water can be finally produced in the form of industrial reuse water, the utilization rate of water resources reaches more than 98%, the environmental protection problem that sweat waste water is discharged to the environment is effectively relieved, meanwhile, the water resources are saved, and the zero discharge of waste liquid is realized.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure, 1 is a lime bin, 2 is a lime screw conveyor, 3 is a lime milk pulping tank, 4 is a lime milk conveying pump, 5 is a phosphorus-fluorine reaction tank, 6 is a phosphorus-fluorine sedimentation tank, 7 is a phosphorus-fluorine mixed salt slurry conveying pump, 8 is a phosphorus-fluorine mixed salt filter, 9 is a primary clear liquid tank, 10 is a primary clear liquid conveying pump, 11 is a secondary clear liquid heat exchanger, 12 is a reflux concentration mother liquid heat exchanger, 13 is a circulating concentration mother liquid cooler, 14 is a secondary refrigerant circulating pump, 15 is a secondary refrigerant tank, 16 is a refrigerating unit, 17 is a calcium-magnesium-sodium mixed salt filter, 18 is a concentrated mother liquid conveying pump, 19 is an integrated refrigerating crystallization separator, 20 is a mixed salt conveying pump, 21 is an ice melting tank, 22 is a secondary clear liquid conveying pump, 23 is a secondary clear liquid tank, 24 is a reverse osmosis water inlet pump, 25 is a reverse osmosis booster pump, 26 is a reverse osmosis circulating pump, 27 is a reverse osmosis membrane group, and 28 is an automatic ice scraping machine.
Detailed Description
The technical solution of the present utility model will be further explained below with reference to the accompanying drawings and specific embodiments, and it should be noted that the following embodiments are only preferred embodiments of the present utility model, and should not be construed as limiting the present utility model, and the scope of the present utility model shall be defined by the claims. Modifications and substitutions of the utility model herein will occur to those skilled in the art without the benefit of the teachings presented herein.
Example 1
The device for recycling the phosphorus chemical wastewater comprises a lime bin 1, wherein lime powder conveyed from the outside is stored in the lime bin 1, a discharge hole at the bottom of the lime bin 1 is connected with a feed inlet of a lime screw conveyor 2, a discharge hole of the lime screw conveyor 2 is connected with a feed inlet at the top of a lime milk pulping tank 3, an outlet at the bottom of the lime milk pulping tank 3 is connected with an inlet of a lime milk conveying pump 4, the lime milk conveying pump 4 conveys lime milk into a phosphorus-fluorine reaction tank 5, lime is uniformly mixed with the phosphorus chemical wastewater in the lime milk pulping tank 3 to prepare lime milk, and the lime milk is conveyed into the phosphorus-fluorine reaction tank 5 to be further added with phosphorus chemical wastewater, so that calcium hydroxide is fully reacted with phosphorus and fluorine in the phosphorus chemical wastewater to generate sediment; the slurry outlet of the phosphorus-fluorine reaction tank 5 is connected with the upper inlet of the phosphorus-fluorine sedimentation tank 6; the clear liquid obtained by secondary sedimentation is discharged from a clear liquid outlet at the upper part of one side of the phosphorus-fluorine sedimentation tank 6 and is conveyed into a primary clear liquid tank 9 by a pipeline, the clear liquid obtained by uniformly stirring and mixing the primary clear liquid tank 9 is respectively conveyed into a secondary clear liquid heat exchanger 11 and a reflux concentration mother liquor heat exchanger 12 by a primary clear liquid conveying pump 10 for heat exchange, and the clear liquid after heat exchange flows out from a hot side outlet of the secondary clear liquid heat exchanger 11 and a hot side outlet of the reflux concentration mother liquor heat exchanger 12 respectively, and is conveyed into an integrated freezing crystallization separator 19 for cooling crystallization desalination after being mixed in the pipeline; the floating ice generated in the integrated freezing and crystallizing separator 19 is conveyed to the ice melting tank 21 through a co-swimming pipeline, the ice melting tank 21 stirs and melts the floating ice to obtain secondary clear liquid, the secondary clear liquid is conveyed to the secondary clear liquid heat exchanger 11 through the secondary clear liquid conveying pump 22 and is conveyed to the secondary clear liquid tank 23 after exchanging heat with primary clear liquid, the secondary clear liquid tank 23 is connected with the reverse osmosis membrane group 27 through the reverse osmosis water inlet pump 24 and the reverse osmosis booster pump 25, the secondary clear liquid is concentrated and separated in the reverse osmosis membrane group 27, and the obtained industrial reuse water is discharged from an outlet of the reverse osmosis membrane group 27.
Preferably, the tops of the lime milk pulping tank 3 and the phosphorus-fluorine reaction tank 5 are respectively provided with a phosphorus chemical wastewater inlet, and the inside is respectively provided with a stirrer for accelerating the mixing speed of lime and phosphorus chemical wastewater and fully reacting calcium hydroxide with phosphorus and fluorine.
Preferably, a mixed liquor outlet is arranged at the bottom of the phosphorus-fluorine sedimentation tank 6, the mixture containing phosphorus-fluorine mixed salt obtained by sedimentation is discharged and conveyed into a phosphorus-fluorine mixed salt filter 8 through a phosphorus-fluorine mixed salt slurry conveying pump 7, the phosphorus-fluorine mixed salt obtained by filtering of the phosphorus-fluorine mixed salt filter 8 is discharged from the bottom outlet and conveyed to the outside of the device for recycling of resources, and clear liquid is discharged from a clear liquid outlet at one side of the clear liquid and conveyed into the phosphorus-fluorine sedimentation tank 6 for secondary sedimentation.
Preferably, the integrated freezing and crystallizing separator 19 is connected with the circulating concentrated mother liquor cooler 13 through the concentrated mother liquor conveying pump 18, the concentrated mother liquor after freezing and crystallizing is cooled, the cooled circulating concentrated mother liquor is discharged from the hot side outlet of the circulating concentrated mother liquor cooler 13 and conveyed back into the integrated freezing and crystallizing separator 19, so that circulating crystallization separation is formed, the desalting effect of the integrated freezing and crystallizing separator 19 is enhanced, and the salt content of floating ice is further reduced.
Preferably, the integrated freezing and crystallizing separator 19 is further connected with the cold side inlet of the reflux concentrated mother liquor heat exchanger 12 through the concentrated mother liquor conveying pump 18, exchanges heat between the concentrated mother liquor after freezing and crystallizing and the primary clear liquor, flows out from the cold side outlet of the reflux concentrated mother liquor heat exchanger 12, and then is conveyed into the phosphorus-fluorine reaction tank 5 for secondary sedimentation.
Preferably, the bottom of the integrated freezing crystallization separator 19 is connected with a calcium-magnesium-sodium mixed salt filter 17 through a mixed salt conveying pump 20, mixed salt is filtered in the mixed salt, the obtained mixed salt is discharged from the bottom of the calcium-magnesium-sodium mixed salt filter 17 and conveyed to the outside of the device for recycling, filtrate is discharged from a filtrate outlet on one side of the calcium-magnesium-sodium mixed salt filter 17 and conveyed back to the integrated freezing crystallization separator 19, and the calcium-magnesium-sodium mixed salt concentrated and crystallized in the integrated freezing crystallization separator 19 is separated and recycled, so that the influence on the treatment effect of the phosphorus chemical wastewater due to the high-salt content blocking device is avoided.
Preferably, an automatic ice scraper 28 is arranged in the integral freezing and crystallizing separator 19, and the automatic ice scraper 28 breaks up the floating ice generated in the integral freezing and crystallizing separator 19 and conveys the broken ice to an outlet, and then conveys the broken ice to the ice melting tank 21 through a pipeline.
Preferably, the deicing tank 21 is further connected with the refrigerating unit 16 through a secondary clear liquid conveying pump 22, and secondary clear liquid is conveyed back to the deicing tank 21 from a cold source outlet of the refrigerating unit 16 after heat exchange and temperature rise in the refrigerating unit 16, so that the melting speed of floating ice is increased.
Further preferably, the refrigerating unit 16 contains a secondary refrigerant, the secondary refrigerant is cooled in the refrigerating unit 16 and then is conveyed to the secondary refrigerant tank 15 through a pipeline for storage, the secondary refrigerant tank 15 is connected with the circulating concentrated mother liquor cooler 13 through the secondary refrigerant circulating pump 14, and the secondary refrigerant is conveyed to the refrigerating unit 16 through the pipeline after being subjected to heat exchange with the circulating concentrated mother liquor in the circulating concentrated mother liquor cooler 13, so that the cold energy is provided for the circulation of the device.
Preferably, a concentrated water outlet is arranged at the bottom of the reverse osmosis membrane group 27, and part of the discharged concentrated water is mixed with water pumped by the reverse osmosis booster pump 25 through the reverse osmosis circulating pump 26 and enters the reverse osmosis membrane group 27 for secondary concentration and separation, so that the concentration of calcium magnesium salt in clear liquid is reduced; and the other part is conveyed back to the primary clear liquid tank 9 through a pipeline, and concentrated water with higher calcium-magnesium-sodium mixed salt concentration is subjected to secondary freezing crystallization, so that all water can be finally produced as industrial reuse water, and the produced industrial reuse water can be recycled, and zero discharge of waste liquid is realized.
Claims (10)
1. The utility model provides a device with phosphorus chemical industry waste water resourceful treatment which characterized in that: the bottom discharge hole of the lime bin (1) is connected with the feed inlet of the lime screw conveyor (2), the discharge hole of the lime screw conveyor (2) is connected with the feed inlet at the top of the lime milk pulping tank (3), and the bottom outlet of the lime milk pulping tank (3) is connected with the phosphorus-fluorine reaction tank (5) through the lime milk conveying pump (4); the slurry outlet of the phosphorus-fluorine reaction tank (5) is connected with the upper inlet of the phosphorus-fluorine sedimentation tank (6); a clear liquid outlet is formed in one side of a phosphorus-fluorine settling tank (6), the phosphorus-fluorine settling tank is fixedly connected with a primary clear liquid tank (9) through a pipeline, the primary clear liquid tank (9) is respectively connected with a secondary clear liquid heat exchanger (11) and a reflux concentration mother liquid heat exchanger (12) through a primary clear liquid conveying pump (10), the secondary clear liquid heat exchanger (11) and the reflux concentration mother liquid heat exchanger (12) are connected with an integrated freezing crystallization separator (19) through pipelines, an upper portion of one side of the integrated freezing crystallization separator (19) is provided with a floating ice outlet and is connected with an ice melting tank (21), the ice melting tank (21) is sequentially connected with a secondary clear liquid tank (23) through a secondary clear liquid conveying pump (22) and a secondary clear liquid heat exchanger (11), and the secondary clear liquid tank (23) is connected with a reverse osmosis membrane group (27) through a reverse osmosis water inlet pump (24) and a reverse osmosis booster pump (25).
2. An apparatus for recycling phosphorus chemical wastewater according to claim 1 and wherein: the tops of the lime milk pulping tank (3) and the phosphorus fluorine reaction tank (5) are respectively provided with a phosphorus chemical wastewater inlet, and the inside is respectively provided with a stirrer for accelerating mixing.
3. An apparatus for recycling phosphorus chemical wastewater according to claim 1 and wherein: the bottom of the phosphorus-fluorine sedimentation tank (6) is provided with a mixed liquid outlet, and the mixed liquid is conveyed into a phosphorus-fluorine mixed salt filter (8) through a phosphorus-fluorine mixed salt slurry conveying pump (7); the bottom of the phosphorus-fluorine mixed salt filter (8) is provided with a mixed salt outlet for discharging solid matters, and one side of the phosphorus-fluorine mixed salt filter is provided with a clear liquid outlet and is connected with the phosphorus-fluorine settling tank (6) through a pipeline.
4. An apparatus for recycling phosphorus chemical wastewater according to claim 1 and wherein: the lower part of one side of the integrated freezing crystallization separator (19) is connected with the circulating concentrated mother liquor cooler (13) through the concentrated mother liquor delivery pump (18), and the circulating concentrated mother liquor cooler (13) is connected with an inlet pipeline of one side of the integrated freezing crystallization separator (19).
5. An apparatus for recycling phosphorus chemical wastewater according to claim 1 and wherein: the integrated freezing crystallization separator (19) is also connected with the cold side inlet of the reflux concentrated mother liquor heat exchanger (12) through a concentrated mother liquor conveying pump (18), and the cold side outlet of the reflux concentrated mother liquor heat exchanger (12) is connected with the phosphorus-fluorine reaction tank (5) through a pipeline.
6. An apparatus for recycling phosphorus chemical wastewater according to claim 1 and wherein: the bottom of the integrated freezing crystallization separator (19) is connected with a calcium-magnesium-sodium mixed salt filter (17) through a mixed salt conveying pump (20), a mixed salt outlet is arranged at the bottom of the calcium-magnesium-sodium mixed salt filter (17) to discharge solid matters, and a clear liquid outlet is arranged at one side of the integrated freezing crystallization separator and connected with the integrated freezing crystallization separator (19) through a pipeline.
7. An apparatus for recycling phosphorus chemical wastewater according to any of claims 1, 4-6 and characterized in that: an automatic ice scraping machine (28) is arranged in the integrated freezing and crystallizing separator (19), the automatic ice scraping machine (28) is used for processing floating ice generated in the integrated freezing and crystallizing separator (19) and conveying the floating ice to an outlet, and crushed ice is conveyed into the ice melting tank (21) through a pipeline.
8. An apparatus for recycling phosphorus chemical wastewater according to claim 1 and wherein: the deicing tank (21) is also connected with the refrigerating unit (16) through a secondary clear liquid conveying pump (22), and secondary clear liquid is conveyed back into the deicing tank (21) from the refrigerating unit (16) after heat exchange and temperature rise in the refrigerating unit.
9. An apparatus for recycling phosphorus chemical wastewater according to claim 8 and wherein: the refrigerating unit (16) contains a secondary refrigerant, the secondary refrigerant is conveyed into the secondary refrigerant tank (15) through a pipeline after being cooled in the refrigerating unit (16), the secondary refrigerant tank (15) is connected with the circulating concentrated mother liquor cooler (13) through the secondary refrigerant circulating pump (14), and the circulating concentrated mother liquor cooler (13) is connected with the refrigerating unit (16).
10. An apparatus for recycling phosphorus chemical wastewater according to claim 1 and wherein: a concentrated water outlet is formed in the bottom of the reverse osmosis membrane group (27), and part of the discharged concentrated water is mixed with water pumped by a reverse osmosis booster pump (25) through a reverse osmosis circulating pump (26) and enters the reverse osmosis membrane group (27) for secondary concentration and separation; the other part is conveyed back to the primary liquid tank (9) through a pipeline for secondary freezing crystallization.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320037516.8U CN218931904U (en) | 2023-01-07 | 2023-01-07 | Device for recycling phosphorus chemical wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320037516.8U CN218931904U (en) | 2023-01-07 | 2023-01-07 | Device for recycling phosphorus chemical wastewater |
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