CN216890469U - System for recycling lithium ions in lithium-containing wastewater - Google Patents
System for recycling lithium ions in lithium-containing wastewater Download PDFInfo
- Publication number
- CN216890469U CN216890469U CN202220965977.7U CN202220965977U CN216890469U CN 216890469 U CN216890469 U CN 216890469U CN 202220965977 U CN202220965977 U CN 202220965977U CN 216890469 U CN216890469 U CN 216890469U
- Authority
- CN
- China
- Prior art keywords
- reverse osmosis
- lithium
- tank
- unit
- ion exchange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The utility model relates to a system for recovering lithium ions in lithium-containing wastewater, which comprises a pretreatment unit, a primary reverse osmosis unit and an ion exchange unit which are sequentially connected; the fresh water outlet of the first-stage reverse osmosis unit is connected with the ion exchange unit, and the concentrated water outlet is connected with the second-stage reverse osmosis unit; the pretreatment unit comprises a filter, a pH adjusting tank and a decarbonizer which are connected in sequence; the outlet of the ion exchange unit is connected in parallel with the pH adjusting tank and the water production tank; the fresh water outlet of the second-stage reverse osmosis unit is connected with a pH adjusting tank, and the concentrated water outlet is connected with a lithium sulfate collecting tank. The pretreatment unit can protect the two-stage reverse osmosis unit and the ion exchange unit; two stages of reverse osmosis units are connected in series, so that the concentration effect is improved; the ion exchange unit further absorbs the fresh water of the first-stage reverse osmosis unit to remove lithium, so that the recovery rate of lithium is improved; the fresh water outlets of the ion exchange unit and the second-stage reverse osmosis unit are connected with the pretreatment unit, so that the recovered lithium ions enter the two-stage reverse osmosis unit to produce lithium sulfate, and the recovery rate of the lithium ions is improved.
Description
Technical Field
The utility model belongs to the technical field of lithium-containing wastewater treatment devices, and particularly relates to a system for recovering lithium ions in lithium-containing wastewater.
Background
With the development of the new energy battery industry, metallic lithium is widely used as a main material of batteries. The reserves of primary resources such as lithium ore and the like in China are low, the external dependence is up to 70 percent at present, the rapidly-increased market demand is difficult to meet, and the contradiction between supply and demand is increasingly prominent. Therefore, the efficient and clean recovery of lithium from lithium-containing wastewater is an important supplement of lithium resources, has great significance for effectively avoiding secondary pollution risks of waste lithium ions to ecological environment and human health, guaranteeing safe supply of strategic lithium metal and sustainable development of new energy automobile industry, and the recovered lithium salt product is also an important secondary resource and has economic benefit.
At present, lithium resources at home and abroad mainly come from lithium ores and lithium resources in salt lake brine, and technological methods for extracting lithium salts from the salt lake brine mainly comprise a precipitation method, an extraction method, an ion exchange adsorption method, a carbonization method, a calcination leaching method, an electrodialysis method and the like. On the other hand, a large amount of lithium ions are discharged along with wastewater in the production process of new energy batteries, and in the field of lithium battery recovery, after elements such as nickel, cobalt, iron and the like are extracted and back-extracted by a wet method, a large amount of lithium-containing waste liquid is also generated, and lithium extraction needs to be recovered again urgently. The lithium-containing waste liquid has the characteristics of various types of anion and cation impurities, high content of potassium and sodium ions and difficulty in large-scale treatment, and lithium recovery is a key and difficult point of the wastewater treatment.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems, the utility model provides a system for recovering lithium ions in lithium-containing wastewater, which comprises a pretreatment unit, a first-stage reverse osmosis unit and an ion exchange unit which are sequentially connected; a fresh water outlet of the first-stage reverse osmosis unit is connected with the ion exchange unit, and a concentrated water outlet is connected with the second-stage reverse osmosis unit;
the pretreatment unit comprises a filter, a pH adjusting tank and a decarbonizer which are sequentially connected, wherein the water outlet of the filter is connected with the water inlet of the pH adjusting tank, the water outlet of the pH adjusting tank is connected with the water inlet of the decarbonizer, and the water outlet of the decarbonizer is connected with the water inlet of the first-stage reverse osmosis unit;
the outlet of the ion exchange unit is connected in parallel with a pH adjusting tank and a water production tank;
and a fresh water outlet of the second-stage reverse osmosis unit is connected with a pH adjusting tank, and a concentrated water outlet of the second-stage reverse osmosis unit is connected with a lithium sulfate collecting tank.
Optionally, a wastewater storage tank is arranged at the upstream of the filter, and the wastewater storage tank is connected with the filter and used for storing lithium-containing wastewater.
Optionally, the filter is a bag filter, and an aeration device is arranged inside the decarbonizer.
Optionally, the second-stage reverse osmosis unit comprises a concentrated water tank and a second-stage reverse osmosis device which are connected in sequence, a concentrated water outlet of the first-stage reverse osmosis unit is connected with a water inlet of the concentrated water tank, and a water outlet of the concentrated water tank is connected with a water inlet of the second-stage reverse osmosis device.
Optionally, the ion exchange unit includes a fresh water tank, an ion exchange device, an eluent storage tank, and a washing and deacidifying liquid tank;
a fresh water outlet of the first-stage reverse osmosis unit is connected with a water inlet of a fresh water tank, a water outlet of the fresh water tank is connected with a first water inlet of the ion exchange device, and an eluant storage tank is connected with a second water inlet of the ion exchange device; the first outlet of the ion exchange device is connected with a water production tank, the second outlet is connected with a water inlet of a washing and deacidifying liquid tank, and a water outlet of the washing and deacidifying liquid tank is connected with a pH adjusting tank.
Optionally, the downstream side of the water production tank is connected with a post-treatment device, the post-treatment device is selected from a recovery device capable of recovering lithium or a discharge device, and the discharge device can be a municipal drainage pipeline.
The system for recovering the lithium ions in the lithium-containing wastewater has the following beneficial effects:
the pretreatment unit sequentially filters the lithium-containing wastewater, adjusts the pH value and removes CO by sequentially arranging a filter, a pH adjusting tank and a decarbonizer2The pretreatment of the lithium-containing wastewater, which enters the first-stage reverse osmosis unit, is better in state, and the two-stage reverse osmosis unit and the ion exchange unit are protected; according to the utility model, two stages of reverse osmosis units are connected in series, so that the concentration effect on lithium-containing wastewater is improved, and the purity of a product in the lithium sulfate collecting pool is further improved; according to the utility model, the fresh water outlet of the first-stage reverse osmosis unit is connected with the ion exchange unit, so that the fresh water can be further adsorbed to remove lithium, and the overall lithium ion recovery rate is improved; fresh water outlet of ion exchange unit and second-stage reverse osmosis unitAnd the pH adjusting tank is connected, so that the recovered lithium ions enter the primary reverse osmosis unit and the secondary reverse osmosis unit again for producing lithium sulfate, and the recovery rate of the lithium ions is further improved.
Drawings
Fig. 1 is a schematic diagram of the system for recovering lithium ions from lithium-containing wastewater.
In the attached drawing, 1-a wastewater storage tank, 2-a pretreatment unit, 201-a filter, 202-a pH adjusting tank, 203-a decarbonizer, 3-a first-stage reverse osmosis unit, 4-a second-stage reverse osmosis unit, 401-a concentrated water tank, 402-a second-stage reverse osmosis device, 5-an ion exchange unit, 501-a fresh water tank, 502-an ion exchange device, 503-an eluent storage tank, 504-an acid eluting tank, 6-a lithium sulfate collecting tank, 7-a water production tank and 8-a post-treatment device.
Detailed Description
The system for recovering lithium ions from lithium-containing wastewater described in this embodiment, as shown in fig. 1, includes a pretreatment unit 2, a first-stage reverse osmosis unit 3, and an ion exchange unit 5, which are connected in sequence; a fresh water outlet of the first-stage reverse osmosis unit 3 is connected with the ion exchange unit 5, and a concentrated water outlet is connected with the second-stage reverse osmosis unit 4;
the pretreatment unit 2 comprises a filter 201, a pH adjusting tank 202 and a decarbonizer 203 which are connected in sequence, a water outlet of the filter 201 is connected with a water inlet of the pH adjusting tank 202, a water outlet of the pH adjusting tank 202 is connected with a water inlet of the decarbonizer 203, and a water outlet of the decarbonizer 203 is connected with a water inlet of the primary reverse osmosis unit 3;
the outlet of the ion exchange unit 5 is connected in parallel with a pH adjusting tank 202 and a water production tank 7;
and a fresh water outlet of the second-stage reverse osmosis unit 4 is connected with the pretreatment unit 2, and a concentrated water outlet is connected with the lithium sulfate collecting tank 6.
Optionally, a wastewater storage tank 1 is arranged at the upstream of the filter 201, and the wastewater storage tank 1 is connected with the filter 201 and is used for storing lithium-containing wastewater.
Optionally, the filter 201 is a bag filter 201, and an aeration device is arranged inside the decarbonizer 203.
Optionally, the second-stage reverse osmosis unit 4 comprises a concentrated water tank 401 and a second-stage reverse osmosis device 402 which are connected in sequence, a concentrated water outlet of the first-stage reverse osmosis unit 3 is connected with a water inlet of the concentrated water tank 401, a water outlet of the concentrated water tank 401 is connected with a water inlet of the second-stage reverse osmosis device 402, a fresh water outlet of the second-stage reverse osmosis device 402 is connected with the pH adjusting tank 202, and a concentrated water outlet of the second-stage reverse osmosis device 402 is connected with the lithium sulfate collecting tank 6.
Optionally, the ion exchange unit 5 includes a fresh water tank 501, an ion exchange device 502, an eluent storage tank 503, and an elution acid tank 504;
a fresh water outlet of the first-stage reverse osmosis unit 3 is connected with a water inlet of a fresh water tank 501, a water outlet of the fresh water tank 501 is connected with a first water inlet of an ion exchange device 502, and an eluent storage tank 503 is connected with a second water inlet of the ion exchange device 502; the first outlet of the ion exchange device 502 is connected to the water generating tank 7, the second outlet is connected to the water inlet of the acid washing and deacidifying liquid tank 504, and the water outlet of the acid washing and deacidifying liquid tank 504 is connected to the pH adjusting tank 202.
Optionally, the ion exchange device 502 is filled with YS-XF-101 macroporous chelating resin.
Optionally, the downstream side of the water production tank 7 is connected with a post-treatment device 8, the post-treatment device 8 is selected from a recovery device capable of recovering lithium or a discharge device, and the discharge device can be a municipal drainage pipeline.
The filter 201 can remove solid suspended substances and colloids in the lithium-containing wastewater, then the pH value of the wastewater is adjusted to be below 5 in the pH adjusting tank 202, and CO in the wastewater is removed by an aeration device of the decarbonizer 2032. After the pretreatment process, the wastewater is carbonate-free clear weak-acid lithium-containing wastewater.
The first-stage reverse osmosis unit 3 is used for concentrating the wastewater treated by the pretreatment unit 2 to obtain a small part of high-lithium concentrated water and a large part of low-lithium fresh water, and the second-stage reverse osmosis unit 4 is used for further concentrating the small part of high-lithium concentrated water to obtain a lithium sulfate product with a certain content. The low lithium fresh water generated by the first-stage reverse osmosis unit 3 is adsorbed by the ion exchange device 502, then the wastewater enters the water generating tank 7, after the ion exchange column is saturated by adsorption, the adsorbed lithium is eluted by an eluent which is a sulfuric acid solution with a certain concentration, the eluted acid water is returned to the pH adjusting tank 202 for adjusting the pH of the lithium-containing wastewater to 4-4.5, and the fresh water generated by the second-stage reverse osmosis is also returned to the pH adjusting tank 202.
The salinity of the original lithium-containing wastewater is preferably not more than 15%, and the original lithium-containing wastewater can be lithium-containing wastewater generated in the new energy battery industry and can also be salt lake brine.
The adsorption rate of the resin to the lithium ions in the system reaches more than 99.9 percent, the comprehensive recovery rate of the system reaches more than 90 percent, and the system has the characteristics of high adsorption rate, good selective adsorption effect, high purity of lithium sulfate products and relatively low cost, and can be expanded to the recycling of the lithium ions in the salt lake.
Claims (7)
1. A system for recovering lithium ions in lithium-containing wastewater is characterized by comprising a pretreatment unit, a primary reverse osmosis unit and an ion exchange unit which are sequentially connected; a fresh water outlet of the first-stage reverse osmosis unit is connected with the ion exchange unit, and a concentrated water outlet is connected with the second-stage reverse osmosis unit;
the pretreatment unit comprises a filter, a pH adjusting tank and a decarbonizer which are sequentially connected, wherein the water outlet of the filter is connected with the water inlet of the pH adjusting tank, the water outlet of the pH adjusting tank is connected with the water inlet of the decarbonizer, and the water outlet of the decarbonizer is connected with the water inlet of the first-stage reverse osmosis unit;
the outlet of the ion exchange unit is connected in parallel with a pH adjusting tank and a water production tank;
and a fresh water outlet of the second-stage reverse osmosis unit is connected with a pH adjusting tank, and a concentrated water outlet of the second-stage reverse osmosis unit is connected with a lithium sulfate collecting tank.
2. The system for recovering lithium ions from lithium-containing wastewater according to claim 1, wherein a wastewater storage tank is arranged upstream of the filter, and the wastewater storage tank is connected with the filter.
3. The system for recovering lithium ions from lithium-containing wastewater according to claim 1, wherein the filter is a bag filter, and an aeration device is provided inside the decarbonizer.
4. The system for recovering lithium ions in lithium-containing wastewater according to claim 1, wherein the secondary reverse osmosis unit comprises a concentrated water tank and a secondary reverse osmosis device which are connected in sequence, a concentrated water outlet of the primary reverse osmosis unit is connected with a water inlet of the concentrated water tank, and a water outlet of the concentrated water tank is connected with a water inlet of the secondary reverse osmosis device.
5. The system for recovering lithium ions in lithium-containing wastewater according to claim 1, wherein the ion exchange unit comprises a fresh water tank, an ion exchange device, an eluent storage tank and a washing and deacidifying liquid tank.
6. The system for recovering lithium ions in lithium-containing wastewater according to claim 5, wherein a fresh water outlet of the primary reverse osmosis unit is connected with a water inlet of the fresh water tank, a water outlet of the fresh water tank is connected with a first water inlet of the ion exchange device, and the eluent storage tank is connected with a second water inlet of the ion exchange device; the water tank is produced in ion exchange device's first exit linkage, and the second exit linkage wash the water inlet of deacidification liquid case, wash the delivery port of deacidification liquid case and connect the pH equalizing basin.
7. The system for recovering lithium ions from lithium-containing wastewater according to claim 1, wherein a downstream side of the water production tank is connected to a post-treatment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220965977.7U CN216890469U (en) | 2022-04-25 | 2022-04-25 | System for recycling lithium ions in lithium-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220965977.7U CN216890469U (en) | 2022-04-25 | 2022-04-25 | System for recycling lithium ions in lithium-containing wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216890469U true CN216890469U (en) | 2022-07-05 |
Family
ID=82193792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220965977.7U Active CN216890469U (en) | 2022-04-25 | 2022-04-25 | System for recycling lithium ions in lithium-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216890469U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353238A (en) * | 2022-08-02 | 2022-11-18 | 苏州苏净环保工程有限公司 | Treatment method of battery-grade lithium nitrate production wastewater |
-
2022
- 2022-04-25 CN CN202220965977.7U patent/CN216890469U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353238A (en) * | 2022-08-02 | 2022-11-18 | 苏州苏净环保工程有限公司 | Treatment method of battery-grade lithium nitrate production wastewater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104355365B (en) | The processing method of chromate waste water zero release of pollutant | |
| CN103572319B (en) | The method of electroplating concentrated control waste water reclamation nickel | |
| CN105858987B (en) | The recycling treatment process of pure water pure nickel is reclaimed from electronickelling poaching wastewater | |
| CN105174556B (en) | A kind of method of peracid high ferro heavy metal wastewater thereby sub-prime resource reclaim | |
| CN103553249B (en) | In electroplating effluent, acid is separated and heavy metal collection method | |
| CN107217142B (en) | A kind of sub-prime recycles the acidproof chelating resin combinatorial regulation method of complicated heavy metal | |
| CN101746906A (en) | Method for processing electroplating wastewater with heavy metal ions | |
| CN101982433A (en) | Method for harmless and recycling treatment of stainless steel acid washing waste water neutralization sludge | |
| CN102660687A (en) | Method for recycling heavy metal resources of stainless steel pickling waste water neutralization sludge | |
| CN101219838A (en) | Method for processing heavy metal industrial waste water with low concentration | |
| CN107354484A (en) | Method for removing chlorine in zinc electrolysis waste liquid | |
| CN103539283A (en) | Comprehensive treatment method for removing Sb and Bi impurities in Cu electrolyte | |
| CN216890469U (en) | System for recycling lithium ions in lithium-containing wastewater | |
| CN201512599U (en) | Equipment for recovering metallic copper or nickel from electroplating rinse water | |
| CN105692768A (en) | Method for selectively extracting heavy metals in heavy metal-ammonia complexing wastewater by virtue of chelate resin | |
| CN105200233A (en) | Method for recovering manganese and magnesium from manganese electrolysis anode liquid | |
| CN105753219A (en) | Process for purifying and treating vanadium-containing wastewater in advanced manner and process for recycling vanadium and chromium | |
| CN101708908B (en) | Novel method for treating electroplating chromium-containing wastewater and recovering metal ions | |
| CN103320624B (en) | Method for selectively extracting gold and silver from copper anode slime | |
| CN203715400U (en) | Low-concentration lead-containing wastewater treatment equipment | |
| CN104561592A (en) | Nickel-containing electroplating wastewater treatment and nickel recovery method | |
| RU2489510C2 (en) | Extraction method of natural uranium concentrate from sulphuric acid solutions of underground leaching, and plant for its implementation | |
| CN203602414U (en) | System for recovering silvering wastewater and silver | |
| CN204589307U (en) | A kind of modified version regenerating alkaline etching liquid circulation and copper retrieving arrangement | |
| CN110980876A (en) | Treatment process for recovering copper and recycling chromium from passivation solution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |