CN103539294B - Reclaim the method for silver-plated waste water and silver - Google Patents
Reclaim the method for silver-plated waste water and silver Download PDFInfo
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- CN103539294B CN103539294B CN201310466158.3A CN201310466158A CN103539294B CN 103539294 B CN103539294 B CN 103539294B CN 201310466158 A CN201310466158 A CN 201310466158A CN 103539294 B CN103539294 B CN 103539294B
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Abstract
The invention discloses a kind of method reclaiming silver-plated waste water and silver, it comprise the purifying treatment of silver-plated waste water, multi-cycle separation reuse, Ag-containing solution circulation concentrate, electrolytic recovery four technique units of silver.Electrosilvering Cleaning Wastewater to be made pure water by the method for one section of multi-cycle separation and is got back to production line and recycle by the present invention, achieves the zero release of electrosilvering waste water.Simultaneously by two sections of concentrated concentrated solutions obtained relative to silver-plated Cleaning Wastewater more than 160 times silver contents of circulation; reclaimed by electrolysis process again; obtain relative to silver-plated Cleaning Wastewater more than 160 times concentrated solutions by extremely economic method; make the efficiency of electrolytic recovery higher, cost reduces, and the content solved because of silver in existing silver-plated waste water is too low; reclaim uneconomical; do not reclaim and unfortunate dilemma, both saved noble metal resource, and protected environment again.
Description
Technical field
The invention belongs to industrial waste water treatment, be specifically related to a kind of method of recover silver from electroplating wastewater.
Background technology
Containing various heavy composition in electroplating wastewater, according to the technical project of " qualified discharge ", the discharge of wastewater of treated " up to standard ", still has certain pollution to environment, simultaneously due to the raw material such as gold and silver, copper, nickel, chromium that plating uses, be all be worth very high noble metal.High for heavy metal out of electroplating wastewater composition recovery value, deal with the characteristic serious to environmental hazard improperly.Contriver passes through the multiple treatment process repetition test of electroplating wastewater and utilization, have found the direct of a kind of less expensive from rinse bath, reclaim single metal ion, realize rinse water and metal ion fully recovering and to carry out classifying the method that cycle for the treatment of utilizes to electroplating washing water, respectively in November, 2008 and in April, 2010 having applied for patent of invention, (patent No. is respectively: ZL200810235197.1; ZL201010156033.7), foregoing invention effectively solves the recycle of copper facing, nickel plating, chromium plating wastewater, and copper, nickel, chromium recovery problem, due to the chemistry of silver-plated waste water and physical property and above-mentioned waste water difference very large, the recycle of silver-plated waste water and the recovery problem of silver fail to relate to.The method of existing silver-plated wastewater treatment mainly contains chemical precipitation method, electrolytic process, metal replacement method, ion exchange method and absorption method.Chemical precipitation method is traditional " qualified discharge " treatment process, simple to operate, and its maximum deficiency is that water of productive use can not be recycled, and after the silver in waste water is precipitated as solid waste, the large cost of secondary recovery difficulty is high; Electrolytic process is the electrochemical properties utilizing metal, the silver reclaimed in waste water under direct current effect, a kind of effective ways of process containing high concentration electric metal refining waste water, processing efficiency is high, but this method shortcoming is the silver-containing waste water not being suitable for process low concentration, and the large cost of power consumption is high, the process of silver-plated waste water cannot be directly used in; Ion exchange method is simple and convenient, but due to ion-exchanger selectivity strong, manufacture complicated.Cost is high, and regenerating agent consumption is large, is therefore very limited in application; Absorption method is the unique texture Footwall drift silver utilizing sorbent material.Use the absorption method of different sorbent material, there is investment to some extent large, the problems such as working cost is high, and mud generation is large, the shipwreck after process is in qualified discharge.
Summary of the invention
The object of the invention is the chemistry for the silver in the problems referred to above and silver-plated waste water and physical property, specific membrane technology and traditional electrolysis process are combined, devise a kind of direct recover silver from silver-plated waste water of economical and efficient, make silver-plated waste water be purified process simultaneously, thus return the method that production line recycles.
Object of the present invention can be reached by following measures:
Reclaim a method for silver-plated waste water and silver, the method concentrate primarily of the circulation of the purifying treatment of silver-plated waste water, multi-cycle separation reuse, Ag-containing solution, the electrolytic recovery of silver four technique units compositions, it specifically comprises the steps:
(1) purifying treatment of silver-plated waste water: the silver-plated waste water of raw material argentiferous is carried out two-stage filtration purification, wherein single filter purification is completed by sand filter, activated charcoal filter and accurate filter successively, and cascade filtration purification is completed by cartridge filter and UF ultra-filtration equipment successively;
(2) multi-cycle separation reuse: the rear waste water of two-stage filtration purification injects one section of reverse osmosis membrane through high-pressure pump and carries out one section of reverse osmosis isolation, obtains pure water and one section of concentrated solution respectively; Described one section of reverse osmosis membrane adopts polyamide composite film;
(3) circulation of Ag-containing solution concentrates: described one section of concentrated solution is sent into cartridge filter by topping-up pump and filtered, and then delivers to two sections of reverse osmosis membranes through high-pressure pump and carries out two sections of reverse osmosis concentration process, obtain fresh water and two sections of concentrated solutions respectively; The fresh water wherein obtained mixes with the waste water purified through single filter in step (1), carries out follow-up cascade filtration purifying treatment; The two sections of concentrated solutions obtained again by cartridge filter and two sections of reverse osmosis membranes, carry out two sections of reverse osmosis concentration circular treatment after mixing with described one section of concentrated solution; Described two sections of reverse osmosis membranes adopt polyamide composite film;
(4) electrolytic recovery of silver: when concentration of silver ions reaches more than 1.6g/L in two sections of concentrated solutions, derive these two sections of concentrated solutions in electrolyzer, carry out electrolysis treatment, and reclaim the silver obtained in electrolytic process.
In step (1), before single filter purification, the topping-up pump of 0.2 ~ 1MPa can be used to carry out supercharging to silver-plated waste water; Before cascade filtration purification, the topping-up pump of 0.5 ~ 1MPa can be used to carry out supercharging to silver-plated waste water; The pH value of the waste water after two-stage filtration purification reaches 4 ~ 8.
In step (1), first by sand filter and charcoal filter, the suspended substance in coarse filtration waste water, impurity, organism, then carry out essence filter with accurate filter, then with boosting pump, water is injected circulating filtration intermediate water tank.The effect of single filter purification is the objectionable constituent such as organism, impurity, suspended substance in filtering waste water, in order to avoid these materials enter UF ultrafiltration system, causes the blocking of cartridge filter and UF ultra-filtration equipment, pollution and work-ing life to shorten.After the water of single filter purifying treatment enters intermediate water tank, inject cartridge filter and UF ultra-filtration equipment successively by topping-up pump, carry out cascade filtration purifying treatment, ultra-filtration membrane is the porous-film that one has super " screening " function.Effectively can remove the particulate in waste water, colloid, bacterium and macromolecule organic matter, reduce the water-quality guideline such as turbidity, COD, TOC, make reverse osmosis membrane obtain protecting more reliably.
Quartz filter in step (1) adopts quartz sand as filter core, and such as select 60 object quartz sands as filter core, activated charcoal filter preferably adopts active fruit shell carbon as filter core.Wherein the filter opening of accurate filter is at about 1 ~ 10 μ, preferably adopts 5 μ accurate filters.Cartridge filter filter opening, at about 1 ~ 10 μ, preferably adopts 5 μ cartridge filters; UF ultra-filtration equipment can adopt 1 ~ 20nm, particularly 10nmUF ultra-filtration equipment.
In step (2), the pressure of described high-pressure pump is 2 ~ 3MPa, and the temperature of one section of reverse-osmosis treated is 5 ~ 45 DEG C.One section of reverse osmosis membrane preferably adopts sw30hr-320 polyamide composite film; In one section of concentrated solution, the mass concentration of silver is 3 ~ 6 times of the silver-plated waste water of raw material argentiferous.
In step (2), the waste water through cascade filtration purifying treatment sends into one section of reverse osmosis membrane separation by high-pressure pump, can obtain the concentrated solution of pure water and about 4 times.Pure water returns production line and uses, and concentrated solution enters two sections of circulating filtration water tanks.Wherein one section of reverse osmosis membrane can adopt 0.01 ~ 1nm, particularly one section of reverse osmosis membrane of 0.1nm.One section of reverse osmosis membrane can adopt polyamide composite film, such as sw30hr-320 polyamide composite film.
In step (3), the pressure of described topping-up pump is 0.5 ~ 1.5MPa, and the pressure of high-pressure pump is 3 ~ 4MPa, and the temperature of two sections of reverse-osmosis treated is 5 ~ 45 DEG C, and two sections of reverse osmosis membranes preferably adopt sw30-380 polyamide composite film.
In step (3), after the concentrated solution that one section of circulation produces enters two sections of circulating filtration water tanks, then to be filtered by cartridge filter, remove issuable particulate in circulation.Inject two sections of reverse osmosis membrane separation by high-pressure pump after filtration to concentrate, the water be separated is got back to one section of intercycle water tank and is participated in one section of multi-cycle separation again, concentrated solution participates in two sections of circulations by returning two sections of intercycle water tanks after dense water collection tank, is repeatedly separated concentrated.Within every 48-72 hour, collect a silver ion content at dense water collection tank and reach more than 1.6g/L, particularly about 2.1g/L concentrated solution, carries out electrolytic recovery.Cartridge filter filter opening in step (3), at about 1 ~ 10 μ, preferably adopts 5 μ; Two sections of reverse osmosis membranes preferably adopt two sections of reverse osmosis membranes of 1-2nm.Two sections of reverse osmosis membranes can adopt polyamide composite film, such as sw30-380 polyamide composite film.
In step (4), described electrolyzer adopts concentric bitubular electrode whirlwind-type electrolyzer; The power acquisition direct supply of electrolyzer; The negative electrode and positive electrode of electrolyzer adopts stainless steel respectively, titanium is made.The cathode and anode spacing of electrolyzer controls at 75mm ~ 160mm; Bath voltage 1.8V ~ the 2.2V of electrolyzer; The current density 0.17A/dm of electrolyzer
2~ 0.6A/dm
2, current efficiency 70% ~ 80%, eddy flow amount 400L/h ~ 600L/h.Be generally add nitric acid in electrolytic process, make nitric acid in solution reach finite concentration, as 2 ~ 10g/L, then add NaNO
3, make the temperature of silver-containing liquid waste in electrolyzer maintain more than certain temperature, as more than 50 DEG C are carried out electrolysis treatment.
In step (4), electrolyzer adopts direct supply and electrolyzer and the equal reliable ground of power unit.In the middle of negative electrode and anode, insert a glass stick, the close middle negative electrode of glass stick also around the cathode rotary of centre in electrolytic process, makes the short circuit of negative and positive the two poles of the earth to prevent the argent produced in electrolytic process.In electrolyzer, concentrated solution temperature controls between 40-50 DEG C, and temperature is maintained by the heat produced in electrolytic process.Add HNO
3between adjust ph to 1.5-2.0, add a small amount of NaNO
3to increase solution conductivity.The argent produced in electrolytic process is scraped by the glass stick in rotating, and lays Polypropylene in a cell to collect argent.Electrolysis is in solution, concentration of silver ions is low to moderate 20-50mg/L, and every cubic metre of waste water can obtain the about 2.1kg of argent.
The invention also discloses a kind of system reclaiming silver-plated waste water and silver, this system comprises single filter purification system, cascade filtration purification system, multi-cycle separation reclaiming system, circulation concentration systems and electrolyzing and recycling system, described single filter purification system comprises the topping-up pump be connected successively, sand filter, activated charcoal filter and accurate filter, described cascade filtration purification system comprises the topping-up pump be connected successively, cartridge filter and UF ultra-filtration equipment, the outlet of described single filter purification system connects the entrance of an intermediate water tank 1, an outlet of this intermediate water tank 1 connects the entrance of described cascade filtration purification system, described multi-cycle separation reclaiming system comprises the high-pressure pump and one section of reverse osmosis membrane apparatus that are connected successively, and the outlet of described cascade filtration purification system connects the entrance of described multi-cycle separation reclaiming system, described circulation concentration systems comprises the topping-up pump be connected successively, cartridge filter, high-pressure pump and two sections of reverse osmosis membrane apparatus, the outlet of described multi-cycle separation reclaiming system connects an entrance of an intermediate water tank 2, an outlet of this intermediate water tank 2 connects the entrance of described circulation concentration systems, the water outlet of two sections of reverse osmosis membrane apparatus in circulation concentration systems connects an entrance of described intermediate water tank 1, the dense water out of two sections of reverse osmosis membrane apparatus connects the entrance of an Ag-containing solution collection box, an outlet of this Ag-containing solution collection box connects an entrance of described intermediate water tank 2, another outlet of this Ag-containing solution collection box connects the entrance of described electrolyzing and recycling system.
The technology that the present invention comprehensively adopts " circulation of waste water filtering purification+multi-cycle separation reuse+solution concentrates+electrolytic recovery ", achieves silver-plated purification of waste water, separation, reuse, achieves concentrated, recovery simultaneously to silver wherein.The method economy of waste water recycling, the effective cost of silver recovery is low, solves two hang-ups of silver-plated waste water circulation treatment for reuse difficulty and silver recovery cost-effective rate simultaneously.The present invention reaches satisfied isolation and identification effect by the minimum device of method of iterative cycles, the simplest structure, solves silver-plated silver in waste ion content low, the low difficulty of electrolytic recovery cost-effective rate by the method for economy.
Feature of the present invention is: first by lower for concentration in electrosilvering waste liquid and silver ions without recovery value is concentrated into the concentration with recovery value, introduce without any secondary pollutant in this process, this concentration process belongs to the normal electroplating wastewater processing flow process of electroplating enterprise, drops into without extras and man-hour.Make use of equipment or the technology of the use of electroplating enterprise routine at electrolytic process described in the invention, reduce equipment investment and operation cost.The mode of the present invention and the original electrosilvering liquid waste disposal of electroplating industry, to comparing, has the simple less investment of equipment and operation cost is low, and technological process is simple, pollutes little and silver-colored withdrawal ratio high, extracts the simple feature of liquid waste disposal after argent.
Beneficial effect of the present invention:
1, the present invention adopts polyamide composite film electrosilvering Cleaning Wastewater to be made pure water to get back to production line and recycle, adopt another kind of polyamide composite film simultaneously, by the concentrated concentrated solution obtained relative to silver-plated Cleaning Wastewater more than 160 times silver contents that circulates, reclaimed by electrolysis process, this is that prior art is unapproachable again.Existing concentration technique can only obtain the concentrated solution relative to silver-plated Cleaning Wastewater about 4 times, reclaims wherein silver in so very difficult economic method in the solution of silver concentration that contains.2, the more existing three sections of membrane separation technique advantages of the present invention are:
1) cost of investment is lower, The present invention reduces a set of tripping device, about reduces by the cost of investment of more than 20%.
2) the present invention is under the prerequisite reaching better effect, decreases a set of separating device, and component, device reduce, and system architecture is simpler, and reliability is higher.
3) owing to employing the combination of two sections of iterative cycles methods and electrolytic recovery method; obtain relative to silver-plated Cleaning Wastewater more than 160 times concentrated solutions by extremely economic method; make the efficiency of electrolytic recovery higher; cost reduces; the content solved because of silver in existing silver-plated waste water is too low, reclaims uneconomical, does not reclaim and unfortunate dilemma; both save noble metal resource, protect environment again.
Accompanying drawing explanation
Fig. 1 is the simple and clear schematic flow sheet of the present invention;
Fig. 2 is system of the present invention and schematic flow sheet.
Embodiment
Concrete embodiment is further illustrated below in conjunction with drawings and Examples:
Embodiment 1
In the present embodiment, the silver ion content of silver-plated waste water is about 10mg/L, the concentrated solution silver ion content that one section of reverse osmosis membrane separation obtains is about 40mg/L, two sections of concentrated concentrated solution silver ion contents obtained of reverse osmosis membrane circulation are about 2.1g/L, from concentrated solution, finally obtained the argent of about 2g/L by electrolytic recovery.The schema realized is shown in Fig. 1 and Fig. 2, and concrete operating method is:
The purifying treatment of silver-plated waste water: adopt boosting pump (pressure of the pump that this example is selected is 0.5MPa) to be injected by the silver-plated waste water of argentiferous to filter drum pot type quartz filter and charcoal filter that the water yield is 1.5T/h as the pre-filtering device of 5 μ accurate filters, enter intermediate water tank 1 by the water filtered.Intermediate water tank 1 is equipped with high-low water level liquid level meter, the startup of control pump and stopping.Impurity after purifying treatment in waste water, organism, suspended substance etc., all by filtering, when waste water enters intermediate water tank 1, must do pH value Indexs measure, reach design requirements and namely enter secondary cycle filtration.The design requirements of this example is: pH value range 3.5-8, actual measurement is 6, reach standard, system is by liquidometer signal enabling topping-up pump (pressure is 0.5MPa), waste water is injected cartridge filter successively and UF ultra-filtration equipment carries out cascade filtration purifying treatment, ultra-filtration membrane is the porous-film that one has super " screening " separation function.It effectively can remove particulate in waste water, colloid, bacterium and macromolecule organic matter, reaches effect of protection reverse osmosis membrane.
Multi-cycle separation reuse: the waste water through cascade filtration purification sends into one section of reverse osmosis membrane multi-cycle separation by the high-pressure pump of 3.0MPa.This routine choice for use sw30hr-320 polyamide composite film, its significant parameter is: pH value range 3-10, the highest working pressure 4MPa, permeate 1.2T/H, ratio of desalinization 99.6%, service temperature less than 45 DEG C, produces specific conductivity and is less than the pure water of 15 μ S and one section of concentrated solution of about 4 times.Pure water returns production line and uses, and concentrated solution is separated through two-segment film, and the water of generation is got back to intermediate water tank 1 and participated in multi-cycle separation again.
Two sections of multi-cycle separation: after the concentrated solution that one section of multi-cycle separation produces enters intermediate water tank 2, the cartridge filter that 5 μ filter cores are housed sent into by the topping-up pump being 1.0MPa by pressure, removes issuable particulate in circulation, to ensure that separatory membrane is not blocked.The high-pressure pump of filtering rear 3.5MPa injects two sections of reverse osmosis membrane separation, two sections of reverse osmosis membranes adopt sw30-380 polyamide composite film, its significant parameter is: pH value range 3-10, the highest working pressure 4MPa, permeate 1.6T/H, ratio of desalinization 99.2%, service temperature less than 45 DEG C, the fresh water of generation is got back to intermediate water tank 1 and is participated in follow-up cascade filtration purifying treatment again; Concentrated solution by after dense water collection tank (i.e. Ag-containing solution collection box) enter intermediate water tank 2 mix with one section of concentrated solution after again by cartridge filter and two sections of reverse osmosis membranes, carry out two sections of reverse osmosis concentration circular treatment.
The electrolytic recovery of silver: when concentration of silver ions reaches about 2.1g/L in two sections of concentrated solutions, derive these two sections of concentrated solutions in electrolyzer, carry out electrolysis treatment.Electrolyzer is concentric bitubular electrode whirlwind-type, and electrolyzer adopts stainless steel cathode, Ni―Ti anode.Insert a glass stick in the middle of negative electrode and anode, the speed that glass stick encloses with per minute 10 apart from middle negative electrode 20mm and in electrolytic process is around cathode rotary.Polypropylene is laid to collect in electrolytic process by argent that glass stick scrapes in the bottom of electrolyzer.Electrolysis adopts direct supply and electrolyzer and the equal reliable ground of power unit.Add nitric acid, make concentration of nitric acid in solution reach 6g/L, namely add commercially available concentrated nitric acid 8-10g according to often liter of solution and count.NaNO is added according to 1g/L in solution
3.In electrolyzer, the temperature of silver-containing liquid waste maintains more than 50 DEG C, and this temperature is maintained by the heat produced in electrolytic process.Voltage in electrolyzer between negative and positive two electrode is 2.0V, and interelectrode distance is 100mm; Current density 0.3A/dm
2, eddy flow amount is 500L/h.Energising electrolysis time is 2.5h.Electrolysis terminates rear (interval of electrolysis) and takes out Polypropylene, is taken off by the argent on cloth.
Claims (6)
1. reclaim a method for silver-plated waste water and silver, it is characterized in that it comprises the steps:
(1) purifying treatment of silver-plated waste water: the silver-plated waste water of raw material argentiferous is carried out two-stage filtration purification, wherein single filter purification is completed by sand filter, activated charcoal filter and accurate filter successively, before single filter purification, the topping-up pump of 0.2 ~ 1MPa is used to carry out supercharging to silver-plated waste water; Cascade filtration purification is completed by cartridge filter and UF ultra-filtration equipment successively; Before cascade filtration purification, the topping-up pump of 0.5 ~ 1MPa is used to carry out supercharging to silver-plated waste water; The pH value of the waste water after two-stage filtration purification reaches 4 ~ 8;
(2) multi-cycle separation reuse: the rear waste water of two-stage filtration purification injects one section of reverse osmosis membrane through the high-pressure pump that excess pressure is 2 ~ 3MPa and carries out one section of reverse osmosis isolation, obtains pure water and one section of concentrated solution respectively; Described one section of reverse osmosis membrane adopts sw30hr-320 polyamide composite film;
(3) circulation of Ag-containing solution concentrates: described one section of concentrated solution is sent into cartridge filter by topping-up pump and filtered, then the high-pressure pump being 3 ~ 4MPa through excess pressure is delivered to two sections of reverse osmosis membranes and is carried out two sections of reverse osmosis concentration process, obtains fresh water and two sections of concentrated solutions respectively; The fresh water wherein obtained mixes with the waste water purified through single filter in step (1), carries out follow-up cascade filtration purifying treatment; The two sections of concentrated solutions obtained again by cartridge filter and two sections of reverse osmosis membranes, carry out two sections of reverse osmosis concentration circular treatment after mixing with described one section of concentrated solution; Described two sections of reverse osmosis membranes adopt sw30-380 polyamide composite film;
(4) electrolytic recovery of silver: when concentration of silver ions reaches more than 1.6g/L in two sections of concentrated solutions, derive these two sections of concentrated solutions in electrolyzer, carry out electrolysis treatment, and reclaim the silver obtained in electrolytic process; Wherein electrolyzer adopts concentric bitubular electrode whirlwind-type electrolyzer; The power acquisition direct supply of electrolyzer; The negative electrode and positive electrode of electrolyzer adopts stainless steel respectively, titanium is made.
2. the method for the silver-plated waste water of recovery according to claim 1 and silver, it is characterized in that in step (2), the temperature of one section of reverse-osmosis treated is 5 ~ 45oC.
3. the method for the silver-plated waste water of recovery according to claim 1 and silver, is characterized in that in step (2), and in one section of concentrated solution, the mass concentration of silver is 3 ~ 6 times of the silver-plated waste water of raw material argentiferous.
4. the method for the silver-plated waste water of recovery according to claim 1 and silver, it is characterized in that in step (3), the pressure of described topping-up pump is 0.5 ~ 1.5MPa, and the temperature of two sections of reverse-osmosis treated is 5 ~ 45oC.
5. the method for the silver-plated waste water of recovery according to claim 1 and silver, is characterized in that, in step (4), the cathode and anode spacing of electrolyzer controls at 75mm ~ 160mm; Bath voltage 1.8V ~ the 2.2V of electrolyzer; The current density 0.17A/dm of electrolyzer
2~ 0.6A/dm
2, current efficiency 70% ~ 80%, eddy flow amount 400L/h ~ 600L/h.
6. one kind is reclaimed the system of silver-plated waste water and silver, it is characterized in that this system comprises single filter purification system, cascade filtration purification system, multi-cycle separation reclaiming system, circulation concentration systems and electrolyzing and recycling system, described single filter purification system comprises the topping-up pump be connected successively, sand filter, activated charcoal filter and accurate filter, described cascade filtration purification system comprises the topping-up pump be connected successively, cartridge filter and UF ultra-filtration equipment, the outlet of described single filter purification system connects the entrance of an intermediate water tank 1, an outlet of this intermediate water tank 1 connects the entrance of described cascade filtration purification system, described multi-cycle separation reclaiming system comprises the high-pressure pump and one section of reverse osmosis membrane apparatus that are connected successively, and the high-pressure pump in multi-cycle separation reclaiming system is forced into 2 ~ 3MPa, and described one section of reverse osmosis membrane adopts sw30hr-320 polyamide composite film, the outlet of described cascade filtration purification system connects the entrance of described multi-cycle separation reclaiming system, described circulation concentration systems comprises the topping-up pump, cartridge filter, high-pressure pump and the two sections of reverse osmosis membrane apparatus that are connected successively, and the high-pressure pump of circulation concentration systems is forced into 3 ~ 4MPa, and described two sections of reverse osmosis membranes adopt sw30-380 polyamide composite film, the outlet of described multi-cycle separation reclaiming system connects an entrance of an intermediate water tank 2, an outlet of this intermediate water tank 2 connects the entrance of described circulation concentration systems, the water outlet of two sections of reverse osmosis membrane apparatus in circulation concentration systems connects an entrance of described intermediate water tank 1, the dense water out of two sections of reverse osmosis membrane apparatus connects the entrance of an Ag-containing solution collection box, an outlet of this Ag-containing solution collection box connects an entrance of described intermediate water tank 2, and another outlet of this Ag-containing solution collection box connects the entrance of described electrolyzing and recycling system.
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| CN101786734A (en) * | 2009-09-08 | 2010-07-28 | 刘春喜 | Process for treating acid waste water containing copper, nickel and the like by membrane method |
| CN201762202U (en) * | 2010-08-03 | 2011-03-16 | 长春欧地安电磁安防产业有限公司 | Electroplating purified water treatment device |
| CN102010036A (en) * | 2010-12-04 | 2011-04-13 | 金川集团有限公司 | Treatment method of waste silver electrolyte |
| CN102070259A (en) * | 2010-12-10 | 2011-05-25 | 苏州海创电子有限公司 | Method and device for processing and recycling nickel plating waste water |
| CN202912799U (en) * | 2012-10-09 | 2013-05-01 | 苏州卓融水处理科技有限公司 | Comprehensive recycling system of metal plating wastewater resources |
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| CN103539294A (en) | 2014-01-29 |
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Denomination of invention: Reclaim silver-plated waste water and silver-colored method Effective date of registration: 20170922 Granted publication date: 20150729 Pledgee: Bank of Nanjing, Zhujiang branch, Limited by Share Ltd Pledgor: Nanjing Spring Environmental Science & Technology Co., Ltd. Registration number: 2017990000898 |