CN113698031A - Method and equipment for recovering precious metals from comprehensive wastewater - Google Patents
Method and equipment for recovering precious metals from comprehensive wastewater Download PDFInfo
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- CN113698031A CN113698031A CN202110913298.5A CN202110913298A CN113698031A CN 113698031 A CN113698031 A CN 113698031A CN 202110913298 A CN202110913298 A CN 202110913298A CN 113698031 A CN113698031 A CN 113698031A
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
- C22B11/042—Recovery of noble metals from waste materials
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
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- 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
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- 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
Abstract
A method and a device for recovering precious metals from comprehensive wastewater comprise the following steps: A. introducing the comprehensive wastewater to be treated into a raw water tank, pressurizing, performing precise filtration, then sending into a concentrator with a resin adsorption layer, adsorbing noble metal ions, filtering water and conveying to a biochemical treatment system; B. after the resin adsorption layer adsorbs noble metal ions, the noble metal ions are resolved by dilute sulfuric acid to obtain a high-concentration noble metal sulfate solution; C. sending the high-concentration noble metal sulfate solution into an electrolysis device for electrolysis treatment to obtain a high-purity electrolysis product and electrolysis residual liquid; D. and separating the electrolysis residual liquid by a membrane concentration separation device to obtain dilute sulfuric acid and a high-concentration noble metal sulfate solution, recycling the dilute sulfuric acid, and sending the high-concentration noble metal sulfate solution to an electrolysis device for repeated treatment. The method extracts and converts the noble metal ions in the wastewater into sulfate, and then converts the sulfate into a high-purity electrolysis product through electrolysis, thereby generating considerable economic benefits.
Description
Technical Field
The invention relates to the technical field of comprehensive wastewater environment-friendly treatment, in particular to a method and equipment for recovering precious metals from comprehensive wastewater.
Background
In industrial production, many of the integrated wastewaters contain precious metals. Because the water quality of the comprehensive wastewater is complex, interference factors are many, and the precious metal recovery difficulty is high, at present, most precious metals in the comprehensive wastewater are firstly converted into hydroxide solids through neutralization, then the wastewater is converted into sludge through pH adjustment and coagulating sedimentation, namely, the precious metals in the wastewater are converted into sludge for disposal, a large amount of medicament is required to be added in the treatment process to convert the precious metals into hydroxide sediment, and the treatment cost is high. Moreover, the formed sludge is piled in a large amount, which not only occupies the land, but also causes serious secondary pollution to the environment more easily.
Disclosure of Invention
The invention aims to provide a method and equipment for recovering precious metals from comprehensive wastewater, which can extract precious metal ions in the wastewater to convert into sulfate, and then convert the sulfate into a high-purity electrolytic product through electrolysis, can generate considerable economic benefits, and can realize the current-year recovery project investment to waste and nourish the wastewater.
The technical scheme is as follows:
a method for recovering noble metals from comprehensive wastewater is characterized by comprising the following steps: the method comprises the following steps:
A. noble metal ion adsorption: introducing the comprehensive wastewater to be treated into a raw water tank, pressurizing, performing precise filtration, and then sending into a concentrator with a resin adsorption layer, wherein noble metal ions in the wastewater are trapped and enriched on the resin adsorption layer; the resin is chelate resin with good selectivity, and the height of a resin filling layer is 1500mm-3000 mm; the pH value range of the comprehensive wastewater entering the enricher is 1-7, and the filtering speed of the enricher is 6-12 m/h; the wastewater discharged from the enricher is conveyed to a biochemical treatment system.
B. Noble metal ion resolution: after the resin adsorption layer adsorbs the noble metal ions, the noble metal ions are resolved by dilute sulfuric acid to obtain a high-concentration noble metal sulfate solution.
C. Electrolytic treatment: the high-concentration noble metal sulfate solution is stored, pressurized and sent to an electrolysis device for electrolysis treatment to obtain a high-purity electrolysis product and electrolysis residual liquid.
D. Membrane separation: and separating the electrolysis residual liquid by a membrane concentration separation device to obtain dilute sulfuric acid and a high-concentration noble metal sulfate solution, wherein the dilute sulfuric acid is used as a resolving agent for recycling, and the high-concentration noble metal sulfate solution is sent to an electrolysis device for secondary electrolysis treatment.
Further preferred is: the concentration of the water inlet ions of the electrolysis device is 10000-20000 mg/L.
Further preferred is: the electrolysis device adopts a hanging plate electrolysis or rotational flow electrolysis device, the anode adopts a lead dioxide or titanium electrode, and the cathode adopts a copper plate or a galvanized plate.
Further preferred is: selecting membrane elements of the membrane concentration and separation device: selecting a nanofiltration separation membrane element with excellent acid resistance, wherein the membrane element is made of a polyamide composite membrane, the thickness of a separation net of the membrane element is 28-34mil, and the area of a single membrane element is 7.2-37.2m2Per branch, the membrane flux is 8-18L/m2.h。
Selecting a membrane shell of the membrane concentration and separation device: the pressure grade is 300Psi-450Psi, the material of the membrane shell is FRP (fiber reinforced plastic), and the filling quantity of the membrane elements of the single membrane shell is 1-6.
Flow rate on membrane surface: the flow rate of wastewater of a single membrane shell (pressure vessel) is 1.5-10m3And/or (b).
The operation mode of the membrane concentration and separation device is as follows: circularly concentrating to ensure that the concentration of the noble metal ions in the concentrated solution is more than or equal to 10000 mg/L.
Further preferred is: introducing washing water into the enrichment device before the precious metal ions are analyzed, loosening the resin layer saturated by adsorption and washing out the residual comprehensive wastewater in the resin layer, wherein the washing flow rate is 4-10 m/h; after the desorption, 3 mass percent of sodium hydroxide solution is required to be introduced, the temperature of the sodium hydroxide solution is 15-35 ℃, the introduction amount of the sodium hydroxide solution is 1.5-2 times of the volume of the filled resin, after the resin adsorption layer is transformed to be neutral, washing water is introduced into the enrichment device, the residual desorption solution is washed clean, and the desorption solution is introduced into a desorption solution collecting box for recycling. The introduced sodium hydroxide solution can be recycled.
Further preferred is: the mass percentage of the dilute sulfuric acid is 3-4%; the temperature of the dilute sulphuric acid is 15-35 ℃, and the input amount of the dilute sulphuric acid is 1.5-2 times of the volume of the filled resin.
The device for recovering noble metals from comprehensive wastewater comprises a raw water tank, an enricher, an electrolysis device and a membrane concentration and separation device, wherein a water outlet of the raw water tank is connected with a water inlet of the enricher through a pipeline provided with a booster pump and a precision filter, a filtrate port of the enricher is connected with a post-filtration water tank, a liquid inlet of the enricher is connected with a pure water tank through a pipeline provided with a washing pump, a liquid inlet of the enricher is connected with a No. I analytic liquid tank and a No. II analytic liquid tank through a pipeline provided with an analytic pump, a liquid outlet of the enricher is connected with a concentrated liquid tank, the concentrated liquid tank is connected with the electrolysis device through a pipeline and a circulating pump, the concentrated liquid tank is connected with the membrane concentration and separation device through a pipeline provided with a concentration conveying pump, a penetrating liquid outlet of the membrane concentration and separation device is connected with a penetrating liquid tank, and the penetrating liquid tank is connected with the No. II analytic liquid tank through a pipeline provided with a feedback pump, the concentrated solution outlet of the membrane concentration and separation device is connected with a concentrated solution collecting box, and the concentrated solution collecting box is connected with a concentrated solution box through a pipeline provided with a delivery pump. The pipeline is provided with a conductivity meter, a pressure gauge, a one-way valve, a flowmeter and a manual ball valve according to requirements. The device of above-mentioned adoption can be purchased and installed and use, and wherein ultrafilter is used for filtering impurity such as the suspended solid in the comprehensive waste water, need pack the resin in the enrichment ware and be used for adsorbing noble metal ion.
Further preferred is: the enricher include No. I enricher and No. II enricher, No. I enricher and No. II enricher series arrangement.
The method for recovering the precious metals from the comprehensive wastewater is to extract the precious metals in the comprehensive wastewater and convert the precious metals into high-purity electrolysis products, so that the precious metals in the wastewater are recycled, the benefit maximization is realized, and the waste is changed into valuable. Precious metals in the comprehensive wastewater are extracted, the wastewater does not need to be subjected to pH value adjustment, the pH value needs to be adjusted for the second time in conventional wastewater treatment, namely, the wastewater is adjusted to be alkaline and then adjusted back to be neutral, a coagulant does not need to be added in the technology, the usage amount of the medicament can be saved by about 90 percent compared with the usage amount of the medicament for converting the coagulating sedimentation into the sludge, the wastewater treatment cost is reduced, and the waste is treated by waste. The popularization and the application of the technology can greatly reduce the treatment cost of the wastewater containing precious metals, completely change the environmental protection treatment mode of the conventional treatment process, which only invests and has no income, realize the environmental protection treatment mode of the waste nutrient waste which is invested in the recovery project in the same year, also can generate considerable economic income for environmental protection treatment, and improve the enthusiasm and the motive power of the enterprises for environmental protection and pollution treatment.
Drawings
FIG. 1 is a schematic view showing the connection relationship of the apparatus for recovering noble metals;
wherein the content of the first and second substances,
a cable floating ball is shown,
the conductivity meter is represented by a conductivity meter,
a pressure gauge is shown to indicate the pressure of the fluid,
a one-way valve is shown,
the flow meter is shown in a schematic representation,
represents a manual ball valve;
the names corresponding to the sequence numbers in the figure are:
1. a raw water tank; 2. a booster pump; 3. a precision filter; 4. no. I enricher; 5. no. II enricher; 6. a filtered water tank; 7. a concentrated solution tank; 8. a circulation pump; 9. an electrolysis device; 10. a membrane concentration and separation device; 11. a concentration delivery pump; 12. a concentrated liquid collecting box; 13. a delivery pump; 14. a return pump; 15. a permeate tank; 16. a water washing pump; 17. a pure water tank; 18. a resolving pump; 19. no. I analysis liquid tank; 20. no. II analysis liquid box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The following steps are adopted to recover precious metals from the comprehensive wastewater:
A. noble metal ion adsorption: introducing the comprehensive wastewater to be treated into a raw water tank, pressurizing, performing precise filtration, and then sending into a concentrator with a resin adsorption layer, wherein noble metal ions in the wastewater are trapped and enriched on the resin adsorption layer; the resin is chelate resin with good selectivity, and the height of a resin filling layer is 1500mm-3000 mm; the pH value range of the comprehensive wastewater entering the enricher is 1-7, and the filtering speed of the enricher is 6-12 m/h; the wastewater discharged from the enricher is conveyed to a biochemical treatment system.
B. Noble metal ion resolution: after the resin adsorption layer adsorbs the noble metal ions, the noble metal ions are resolved by dilute sulfuric acid to obtain a high-concentration noble metal sulfate solution.
C. Electrolytic treatment: the high-concentration noble metal sulfate solution is stored, pressurized and sent to an electrolysis device for electrolysis treatment to obtain a high-purity electrolysis product and electrolysis residual liquid.
D. Membrane separation: and (3) separating the electrolysis residual liquid by a membrane concentration and separation device, separating sulfate and sulfuric acid in the electrolysis residual liquid to obtain dilute sulfuric acid and a high-concentration noble metal sulfate solution, recycling the dilute sulfuric acid, and sending the high-concentration noble metal sulfate solution to the electrolysis device for repeated treatment.
The concentration of the water inlet ions of the electrolysis device is 10000-20000 mg/L.
The electrolysis device adopts a hanging plate electrolysis or rotational flow electrolysis device, the anode adopts a lead dioxide or titanium electrode, and the cathode adopts a copper plate or a galvanized plate.
The pressure grade of the membrane concentration and separation device is 300Psi-450Psi, the material of the membrane element is a polyamide composite membrane, the thickness of a separation net of the membrane element is 28-34mil, and the concentration of noble metal ions in a high-concentration noble metal sulfate solution is more than or equal to 10000 mg/L.
Introducing washing water into the enrichment device before the precious metal ions are analyzed, loosening the resin layer saturated by adsorption and washing out the residual comprehensive wastewater in the resin layer, wherein the washing flow rate is 4-10 m/h; after the desorption, 3 mass percent of sodium hydroxide solution is required to be introduced, the temperature of the sodium hydroxide solution is 15-35 ℃, the introduction amount of the sodium hydroxide solution is 1.5-2 times of the volume of the filled resin, after the resin adsorption layer is transformed to be neutral, washing water is introduced into the enrichment device, the residual desorption solution is washed clean, and the desorption solution is introduced into a desorption solution collecting box for recycling.
The mass percentage of the dilute sulfuric acid is 3-4%; the temperature of the dilute sulphuric acid is 15-35 ℃, and the input amount of the dilute sulphuric acid is 1.5-2 times of the volume of the filled resin.
The device for recovering precious metals from comprehensive wastewater comprises a raw water tank 1, an enricher, an electrolysis device 9 and a membrane concentration and separation device 10, wherein a water outlet of the raw water tank 1 is connected with a water inlet of the enricher through a pipeline provided with a booster pump 2 and a precision filter 3, a filtrate port of the enricher is connected with a post-filtration water tank 6, a liquid inlet of the enricher is connected with a pure water tank 17 through a pipeline provided with a washing pump 16, a liquid inlet of the enricher is also connected with a No. I analytic liquid tank 19 and a No. II analytic liquid tank 20 through a pipeline provided with an analytic pump 18, a liquid outlet of the enricher is connected with a concentrated liquid tank 7, the concentrated liquid tank 7 is connected with the electrolysis device 9 through a pipeline and a circulating pump 8, the concentrated liquid tank 7 is also connected with the membrane concentration and separation device 10 through a pipeline provided with a concentration delivery pump 11, a penetrating liquid outlet of the membrane concentration and separation device 10 is connected with a penetrating liquid tank 15, the penetrating liquid tank 15 is connected with a No. II analytic liquid tank 20 through a pipeline provided with a return delivery pump 14, the concentrated solution outlet of the membrane concentration and separation device 10 is connected with a concentrated solution collecting box 12, and the concentrated solution collecting box 12 is connected with the concentrated solution box 7 through a pipeline provided with a delivery pump 13. The pipeline is provided with a conductivity meter, a pressure gauge, a one-way valve, a flowmeter and a manual ball valve according to requirements.
The enricher comprises an enricher No. I4 and an enricher No. II 5, wherein the enricher No. I4 and the enricher No. II 5 are arranged in series.
Engineering application case
Guangdong electric plating Co Ltd
Project wastewater quality and drainage standard
1. Quality and quantity of waste water
pH value: 2-3.
COD：221-248ppm。
Conductivity: 6.36-13.96 mS/cm.
Data sheet for copper ion content and water amount in wastewater (provided by owner):
2. drainage standard
Discharge Standard for electroplating contaminants GB21900-2008 Table II
pH value: 6-9.
Total copper: 0.5 mg/L.
Chemical oxygen demand: 80 mg/L.
Suspended matters: 50 mg/L.
3. Design the amount of wastewater
The comprehensive wastewater amount is about 200m 3/d.
4. Project design runtime: 24h/d (including equipment maintenance time).
Second, quality standard of recovered material (copper)
The product recovered by the project is electrolytic copper, and the purity reaches 99.99 percent.
Third, economic benefits
1. Recovery of electrolytic copper
60t of electrolytic copper products are recovered every year, the selling price of electrolytic copper per t is 65000-:
60t × 67500 yuan/t =4050000 yuan/a. That is, the economic benefit of RMB 4050000 yuan can be generated each year.
2. Saving treatment agent
According to statistics, the amount of the wastewater treatment agent saved every year is 480000 yuan.
The project recovers copper ions in the wastewater through process optimization, and the economic benefit of 4530000 yuan can be realized every year.
Fourth, the treatment cost
Through the annual operation data statistics of the project, the recovery cost of electrolytic copper per ton is 3450 yuan/t (electricity charge is 0.35 yuan/kwh, project is in high and new district of Lanzhou city), the recovery cost of electrolytic copper per year is 60t, and the annual operation cost is as follows:
60t × 3450 yuan/t =207000 yuan/a.
I.e., the annual operating cost is 207000 yuan/a.
Five, annual economic benefits
4530000-207000-membered/a = 4323000-membered/a.
Namely, the economic benefit of 4323000 yuan/a can be generated by recovering the copper ions in the comprehensive wastewater every year.
Sixth, investment recovery period
The total investment of the project is RMB 2890000 Yuan, and the total investment of the project is recovered one year after the project is implemented.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for recovering noble metals from comprehensive wastewater is characterized by comprising the following steps: the method comprises the following steps:
A. noble metal ion adsorption: introducing the comprehensive wastewater to be treated into a raw water tank, pressurizing, performing precise filtration, and then sending into a concentrator with a resin adsorption layer, wherein noble metal ions in the wastewater are trapped and enriched on the resin adsorption layer; conveying the wastewater discharged from the enricher to a biochemical treatment system;
B. noble metal ion resolution: after the resin adsorption layer adsorbs noble metal ions, the noble metal ions are resolved by dilute sulfuric acid to obtain a high-concentration noble metal sulfate solution;
C. electrolytic treatment: storing and pressurizing the high-concentration noble metal sulfate solution, and sending the high-concentration noble metal sulfate solution into an electrolysis device for electrolysis treatment to obtain a high-purity electrolysis product and electrolysis residual liquid;
D. membrane separation: and separating the electrolysis residual liquid by a membrane concentration separation device to obtain dilute sulfuric acid and a high-concentration noble metal sulfate solution, recycling the dilute sulfuric acid, and sending the high-concentration noble metal sulfate solution to an electrolysis device for repeated treatment.
2. The method for recovering precious metals from integrated wastewater according to claim 1, wherein: the concentration of the water inlet ions of the electrolysis device is 10000-20000 mg/L.
3. The method for recovering precious metals from integrated wastewater according to claim 1, wherein: the electrolysis device adopts a hanging plate electrolysis or rotational flow electrolysis device, the anode adopts a lead dioxide or titanium electrode, and the cathode adopts a copper plate, a stainless steel plate or a galvanized plate.
4. The method for recovering precious metals from integrated wastewater according to claim 1, wherein: the pressure grade of the membrane concentration and separation device is 300Psi-450Psi, the material of the membrane element is a polyamide composite membrane, the thickness of a separation net of the membrane element is 28-34mil, and the concentration of noble metal ions in a high-concentration noble metal sulfate solution is more than or equal to 10000 mg/L.
5. The method for recovering precious metals from integrated wastewater according to claim 1, wherein: introducing washing water into the enrichment device before the precious metal ions are analyzed, loosening the resin layer saturated by adsorption and washing out the residual comprehensive wastewater in the resin layer, wherein the washing flow rate is 4-10 m/h; after the desorption, 3 mass percent of sodium hydroxide solution is required to be introduced, the temperature of the sodium hydroxide solution is 15-35 ℃, the introduction amount of the sodium hydroxide solution is 1.5-2 times of the volume of the filled resin, after the resin adsorption layer is transformed to be neutral, washing water is introduced into the enrichment device, the residual desorption solution is washed clean, and the desorption solution is introduced into a desorption solution collecting box for recycling.
6. The method for recovering precious metals from integrated wastewater according to claim 1, wherein: the mass percentage of the dilute sulfuric acid is 3-4%; the temperature of the dilute sulphuric acid is 15-35 ℃, and the input amount of the dilute sulphuric acid is 1.5-2 times of the volume of the filled resin.
7. The method for recovering precious metals from integrated wastewater according to claim 1, wherein: the device for recovering the precious metals from the comprehensive wastewater comprises a raw water tank (1), an enricher, an electrolysis device (9) and a membrane concentration and separation device (10), wherein a water outlet of the raw water tank (1) is connected with a water inlet of the enricher through a pipeline provided with a booster pump (2) and a precision filter (3), a filtrate port of the enricher is connected with a filtered water tank (6), a liquid inlet of the enricher is connected with a pure water tank (17) through a pipeline provided with a washing pump (16), a liquid inlet of the enricher is also connected with a No. I analytic liquid tank (19) and a No. II analytic liquid tank (20) through a pipeline provided with an analytic pump (18), a liquid outlet of the enricher is connected with a concentrated liquid tank (7), the concentrated liquid tank (7) is connected with the electrolysis device (9) through a pipeline and a circulating pump (8), the concentrated liquid tank (7) is also connected with the membrane concentration and separation device (10) through a pipeline provided with a concentration and conveying pump (11), the penetrating fluid outlet of the membrane concentration and separation device (10) is connected with a penetrating fluid tank (15), the penetrating fluid tank (15) is connected with a No. II analysis fluid tank (20) through a pipeline provided with a feedback pump (14), the concentrated fluid outlet of the membrane concentration and separation device (10) is connected with a concentrated fluid collecting box (12), and the concentrated fluid collecting box (12) is connected with a concentrated fluid tank (7) through a pipeline provided with a delivery pump (13).
8. The method for recovering precious metals from integrated wastewater according to claim 2, wherein: the enricher comprises an enricher I (4) and an enricher II (5), wherein the enricher I (4) and the enricher II (5) are arranged in series.
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