CN114620879A - Method for recycling waste liquid from silver nanowire production - Google Patents
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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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- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
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- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G5/00—Compounds of silver
- C01G5/02—Halides
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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
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
- C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
The invention discloses a method for recycling waste liquid from silver nanowire production, which mainly comprises the following steps: (1) adding sodium borohydride into the waste liquid, centrifugally separating a solid phase from a liquid phase, and collecting solid-phase silver; (2) adding supersaturated sodium chloride into the liquid phase obtained in the step (1), centrifugally separating a solid phase and a liquid phase, and collecting solid-phase silver chloride; (3) and (3) adding sodium hydroxide into the liquid phase obtained in the step (2) to adjust the pH value to 7-9, then entering a multistage distillation system, controlling the temperature and the vacuum degree, and distilling sequentially to obtain a low-boiling-point solvent, water and polyol. The method can be used for efficiently treating the waste liquid generated by preparing the silver nanowires by the polyol method, can be used for recycling and utilizing the silver in the waste liquid in a multi-stage manner, and can be used for recycling the low-boiling-point solvent and the high-boiling-point alcohol solvent contained in the waste liquid, so that the outsourcing cost of the waste liquid can be reduced, and considerable benefits can be generated.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for recycling waste liquid generated in silver nanowire production.
Background
The silver nanowire is a typical one-dimensional metal nanomaterial, has the small-size effect of the nanomaterial, and has the excellent electrical conductivity, thermal conductivity and flexibility of silver, so that the silver nanowire is widely applied to the photoelectric related field. Therefore, the material is considered to be the most possible material for replacing the traditional ITO transparent electrode, provides possibility for realizing and bending LED display, touch screens and the like, and has been researched and applied to thin-film solar cells in a large quantity. In addition, due to the large length-diameter ratio effect of the nano silver wire, the nano silver wire has outstanding advantages in the application of conductive adhesive, heat-conducting adhesive and the like.
At present, the synthesis method of the silver nanowires is mainly divided into a physical method and a chemical method, wherein the physical method has the defects of complex process, high technical requirement level, high energy consumption, low product quality and the like, and is not beneficial to large-scale production. The chemical method mainly comprises a polyol method, a template method, a microwave heating method, an electrochemical deposition method, a photochemical reduction method and the like, wherein the polyol method takes polyol as a solvent and a reducing agent, a metal ion compound as a precursor inducer, and a high polymer polyvinylpyrrolidone (PVP) as a stabilizer and a morphology control agent, and the reaction conditions are controlled at high temperature to prepare the silver nanowires; the template method takes ordered mesoporous materials or DNA and the like as templates, and the corresponding silver nanowires are prepared by reduction; the electrochemical deposition method is to reduce silver ions by electrolysis and obtain silver nanowires with different length-diameter ratios by controlling current and potential; in addition, there is a method of preparing silver nanowires by reducing silver nitrate using ultraviolet light in combination with a seed crystal method. Although there are many methods for preparing silver nanowires, the polyol method has the advantages of high productivity, low cost, short reaction time, controllable reaction conditions, and the like compared with other methods, and is the most widely used method at present, and is also the method adopted in industrial production of silver nanowires in factories at present.
The silver nanowires are prepared by a polyol method, wherein the materials with higher cost are silver nitrate and polyol, the product contains a large amount of impurities such as silver particles, short rods and the like, the impurities are usually removed by adopting sedimentation, centrifugation, filtration and other modes, and a large amount of low-boiling-point solvent is also needed in the subsequent silver nanowire purification process, so that the following components mainly exist in waste liquid generated by preparing the silver nanowires by the polyol method: solid silver particles, silver rods, unreacted silver nitrate, by-product silver chloride, low boiling point solvent, polyol, PVP, and most of the water. Because the components in the waste liquid are complex, the common waste liquid treatment method is difficult to realize the efficient recovery of resources, and the generated waste liquid is directly outsourced, so that the cost is high and the resources are wasted. Therefore, there is a need for a targeted and efficient treatment method, which can achieve the recycling of resources or generate benefits, and simultaneously avoid the environmental pollution caused by the direct discharge of waste liquid without effective treatment.
Disclosure of Invention
The invention aims at the waste liquid generated by the industrial production of silver nanowires by using a polyol method at present, and realizes the high-efficiency recovery of resources in the waste liquid and the zero discharge of the waste liquid through multi-step centrifugal separation, post-treatment and multi-stage distillation treatment.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a method for recycling waste liquid from silver nanowire production, which comprises the following steps:
(1) adding sodium borohydride into the waste liquid, centrifugally separating a solid phase from a liquid phase, and collecting solid-phase silver;
(2) adding supersaturated sodium chloride into the liquid phase obtained in the step (1), centrifugally separating a solid phase and a liquid phase, and collecting solid-phase silver chloride;
(3) and (3) adding sodium hydroxide into the liquid phase obtained in the step (2) to adjust the pH value to 7-9, then entering a multistage distillation system, controlling the temperature and the vacuum degree, and distilling sequentially to obtain a low-boiling-point solvent, water and polyol.
Further, in the step (1), the waste liquid mainly contains water, simple substance silver, silver ions, polyhydric alcohol, a low boiling point solvent, inorganic salt and PVP.
Further, the low boiling point solvent includes organic solvents such as acetone, ethyl acetate, isopropyl alcohol, and the like.
Further, the polyhydric alcohol comprises propylene glycol and ethylene glycol.
Further, the inorganic salts include nitrate salts, halogen salts; such as silver nitrate, silver chloride, sodium chloride, and the like.
Further, in the step (1), the rotation speed of the centrifugation is more than 4000 rpm.
Further, in the step (1), the rotation speed of the centrifugation is preferably more than 5000 rpm.
Further, the step (1) further comprises washing the collected solid-phase silver with purified water, centrifuging to obtain purified solid-phase silver, dissolving the purified solid-phase silver in a nitric acid solution, concentrating and crystallizing to obtain silver nitrate, and treating the generated waste liquid and the liquid phase in the step (2).
Further, dissolving the solid-phase silver by using a nitric acid solution with the concentration of 15-25%, wherein the volume ratio of the nitric acid solution to the solid-phase silver is 2-3: 1.
Further, the purity of the silver nitrate is 97% or more.
Further, in the step (2), the rotating speed of the centrifugation is more than 4000 rpm.
Further, the step (2) further comprises the steps of washing the collected solid-phase silver chloride with purified water, centrifuging to obtain purified solid-phase silver chloride, then soaking the purified solid-phase silver chloride in ammonia water, performing suction filtration and separation to obtain a first liquid phase and a solid phase, then washing the solid phase with a mixed solution of ammonia water and ammonium carbonate to obtain a second liquid phase, adding hydrazine hydrate into the first liquid phase and the second liquid phase to reduce to obtain simple substance silver, and treating the generated waste liquid and the liquid phase obtained by centrifuging in the step (2) in the step (3).
Further, the volume ratio of the ammonia water used for impregnating the solid-phase silver chloride to the solid-phase silver chloride is 2-3: 1.
Further, the concentration of the ammonia water is 25%.
Further, the mass ratio of ammonium carbonate in the mixed solution is 5-20 wt%.
Further, the molar ratio of the added hydrazine hydrate to the silver ions in the liquid phase is 2-3: 1.
Further, the purity of the simple substance silver is more than 97%.
Complexing silver chloride into a silver ammonia ionic liquid phase by ammonia water, filtering out a solid phase, washing the solid phase by using a mixed solution of ammonia water and ammonium carbonate, completely complexing and converting the silver chloride into the liquid phase, adding hydrazine hydrate into the collected liquid phase, stirring for 0.5-2h, and reducing the silver chloride in the liquid phase to obtain simple substance silver.
Further, in the step (3), when the temperature of the distillation system is 20-40 ℃ and the vacuum degree is-0.099-0.095 MPa, the low-boiling point solvent is collected.
Further, in the step (3), when the temperature of the distillation system is 60-80 ℃ and the vacuum degree is-0.099 to-0.095 MPa, water is collected.
Further, in the step (3), when the temperature of the distillation system is 120-140 ℃ and the vacuum degree is-0.099 to-0.095 MPa, the polyhydric alcohol is collected.
Further, the solid slag generated in the step (3) is subjected to outsourcing treatment.
Further, in the step (3), the collected water is subjected to COD degradation treatment, the liquid from which COD is removed is subjected to electrolyte removal through an RO membrane and an EDI membrane group to obtain purified water for recycling, and concentrated water generated by the RO membrane treatment is conveyed to a distillation system for circular treatment.
Further, the COD degradation treatment method is one or more of a biochemical treatment method, a redox method, an ion exchange membrane method and an electrolytic method.
Further, the biochemical treatment method includes activated sludge, biofilm, anaerobic and aerobic biological treatment, and the like.
The invention has the beneficial effects that: according to the method, silver simple substances in the waste liquid are converted into high-purity silver nitrate and silver ions are converted into high-purity silver chloride through multi-step centrifugation and reaction, so that the recycling of high-value silver salt and simple substance silver or the production of economic benefits through outsourcing are realized; and simultaneously, carrying out multi-stage distillation on other liquid-phase components in the waste liquid, and recovering solvents and water with corresponding types and different boiling point intervals. The method for recycling the silver nanowire production waste liquid provided by the invention can realize zero emission of the waste liquid, only generates a very small amount of solid waste, greatly reduces the cost of waste liquid outsourcing treatment, simultaneously realizes the maximum utilization of resources and reduces the production cost.
Drawings
FIG. 1 is a process flow chart of the waste liquid from the production of silver nanowires by polyol treatment.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Examples
The embodiment relates to a resource treatment method of waste liquid generated by preparing silver nanowires by a polyol method, wherein the waste liquid comprises the following components in percentage by weight: 30% of water, 1% of simple substance silver, 0.5% of silver ions, 33% of propylene glycol, 33% of acetone, 0.1% of inorganic salt and 2.4% of PVP. The treatment of the waste liquid mainly comprises the following steps:
(1) adding 100-1000pm sodium borohydride into the waste liquid to separate out PVP on the surface of the simple substance silver and lose the function of dispersing the simple substance silver, then centrifuging at the rotating speed of 8000rpm, carrying out solid-liquid separation, and collecting the solid silver. Dispersing and stirring the solid silver by purified water for 1h, centrifuging at the rotating speed of 8000rpm again, repeating the washing and centrifuging operations for three times, carrying out solid-liquid separation, collecting the purified solid silver, and allowing the liquid phase to enter the next step for treatment.
(2) Adding 25% nitric acid with the volume being 3 times that of the purified solid silver, slowly stirring and standing for 2 hours to obtain a silver nitrate solution, and then carrying out concentration crystallization to obtain 14.9kg of silver nitrate; and (3) adding sodium bicarbonate into the waste liquid generated in the concentration process for neutralization, and carrying out next treatment together with the liquid phase obtained by centrifugation in the step (1).
(3) And (3) adding supersaturated sodium chloride into the waste liquid treated in the step (2), reacting with free silver ions to form silver chloride, separating out, centrifuging at the rotating speed of 8000rpm, performing solid-liquid separation, collecting solid-phase silver chloride, dispersing and stirring the solid-phase silver chloride with purified water for 1h, centrifuging at the rotating speed of 8000rpm, repeatedly washing and centrifuging for 3 times, performing solid-liquid separation, and collecting the purified silver chloride. Soaking the purified silver chloride in ammonia water with the volume 3 times that of the silver chloride, stirring for 30min, carrying out suction filtration to collect a liquid phase, washing the solid phase for 2 times by using a mixed solution of the ammonia water and ammonium carbonate (the mass ratio of the ammonium carbonate is 5 wt%), mixing the obtained washing solution with the liquid phase, adding hydrazine hydrate (the added molar amount is 2 times of the silver ions in the solution), mixing and stirring for 2h, and collecting 4.7kg of simple substance silver. And (4) carrying out next treatment on the washing liquid and the waste liquid generated in the operation and the liquid phase obtained by centrifugation.
(4) Adding sodium hydroxide into the waste liquid treated in the step (3) to adjust the pH value to 7-9, then, putting the waste liquid into a negative pressure distiller to perform multistage distillation, collecting about 270L of acetone under the conditions of a vacuum degree of-0.095 MPa and a temperature of 35 ℃, collecting water under the conditions of a vacuum degree of-0.095 MPa and a temperature of 70 ℃, collecting about 297L of propylene glycol under the conditions of a vacuum degree of-0.095 MPa and a temperature of 130 ℃, and performing outward treatment on generated solid residues.
(5) Degrading COD (chemical oxygen demand) contained in the water containing a small amount of organic matters and inorganic salts collected in the step (4) through a biological membrane, and collecting generated solid residues for external treatment; and (4) removing electrolytes from the water from which the COD is removed through an RO membrane and an EDI membrane group to obtain purified water, and conveying the concentrated water treated by the RO membrane into the distiller in the step (4) to perform distillation treatment with the waste liquid to be treated.
The outsourcing treatment cost of the waste liquid in the existing factory is 6000 yuan/1000 kg, the waste liquid treated by the treatment method can collect high-purity silver nitrate, simple substance silver, acetone and propylene glycol, wherein the market price of the silver nitrate is about 6000 yuan/kg, the silver is about 6500 yuan/kg, the acetone is about 11 yuan/L, the propylene glycol is about 10 yuan/L, all recovered products are sold according to the discount of 6 yuan, and the generated economic benefits are shown in the following table 1:
TABLE 1 treatment of waste liquid from the process and the cost of the outsourcing
From the above table, the method for recycling the silver nanowire production waste liquid provided by the invention can save the outlay cost, also can generate considerable economic benefit, and can obtain about 7 ten thousand yuan per ton of waste liquid without calculating the depreciation of equipment.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitutions or changes made by the person skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A method for resourcefully treating silver nanowire production waste liquid, wherein the production waste liquid mainly comprises water, simple substance silver, silver ions, polyhydric alcohol, a low-boiling-point solvent, inorganic salt and PVP, and is characterized by comprising the following steps:
(1) adding sodium borohydride into the waste liquid, centrifugally separating a solid phase from a liquid phase, and collecting solid-phase silver;
(2) adding supersaturated sodium chloride into the liquid phase obtained in the step (1), centrifugally separating a solid phase and a liquid phase, and collecting solid-phase silver chloride;
(3) and (3) adding sodium hydroxide into the liquid phase obtained in the step (2) to adjust the pH value to 7-9, then entering a multistage distillation system, controlling the temperature and the vacuum degree, and distilling sequentially to obtain a low-boiling-point solvent, water and polyol.
2. The method for recycling waste liquid from silver nanowire production according to claim 1, wherein in the step (1) and the step (2), the rotation speed of the centrifugation is more than 4000 rpm.
3. The method for recycling waste liquid from silver nanowire production according to claim 2, wherein in the step (1), the rotation speed of the centrifugation is more than 5000 rpm.
4. The method for recycling waste liquid from silver nanowire production according to claim 1, wherein the step (1) further comprises washing the collected solid-phase silver with purified water, centrifuging to obtain purified solid-phase silver, dissolving the purified solid-phase silver in a nitric acid solution, concentrating and crystallizing to obtain silver nitrate, and treating the generated waste liquid and the liquid phase obtained in the step (1) in the step (2); the purity of the silver nitrate is more than 97%.
5. The method for recycling silver nanowire production waste liquid as claimed in claim 4, wherein the volume ratio of the nitric acid solution to the solid phase silver is 2-3:1, and the concentration of the nitric acid is 15-25%. .
6. The method for recycling silver nanowire production waste liquid according to claim 1, wherein the step (2) further comprises washing the collected solid-phase silver chloride with purified water, centrifuging to obtain purified solid-phase silver chloride, then soaking the purified solid-phase silver chloride in ammonia water, performing suction filtration and separation to obtain a first liquid phase and a solid phase, washing the solid phase with a mixed solution of ammonia water and ammonium carbonate to obtain a second liquid phase, adding hydrazine hydrate into the first liquid phase and the second liquid phase to reduce to obtain elemental silver, and treating the generated waste liquid and the liquid phase obtained by centrifuging in the step (2) in the step (3); the purity of the simple substance silver is more than 97%.
7. The method for recycling the waste liquid of silver nanowire production according to claim 6, wherein the volume ratio of the ammonia water used for impregnating the solid phase silver chloride to the solid phase silver chloride is 2-3: 1; the mass ratio of ammonium carbonate in the mixed solution is 5-20 wt%; the molar ratio of the added hydrazine hydrate to the silver ions in the liquid phase is 2-3: 1.
8. The method for recycling the waste liquid from the production of silver nanowires as claimed in claim 1, wherein in the step (3), the vacuum degree of the distillation system is-0.099 to-0.095 MPa, and when the temperature of the distillation system is 20-40 ℃, the low-boiling-point solvent is collected; collecting water when the temperature of the distillation system is 60-80 ℃; when the temperature of the distillation system is 120 ℃ and 140 ℃, collecting the polyol.
9. The method for resource treatment of waste liquid from silver nanowire production according to claim 1, wherein the step (3) further comprises performing COD degradation treatment on the collected water, removing electrolytes from the liquid with COD removed by RO membrane and EDI membrane group to obtain purified water for reuse, and delivering the concentrated water generated by RO membrane treatment to a distillation system for recycling treatment.
10. The method for recycling the waste liquid from the production of silver nanowires of claim 9, wherein the COD degradation treatment is one or more of a biochemical treatment method, a redox method, an ion exchange membrane method, an electrolytic method and the like.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102071319A (en) * | 2010-12-16 | 2011-05-25 | 惠州市奥美特环境科技有限公司 | Method for preparing high-purity silver from silver-containing waste liquid |
| US20140033870A1 (en) * | 2012-08-01 | 2014-02-06 | Chung Shan Institute Of Science And Technology | Method for separating metal nanoparticles from colloidal metal solution |
| CN107058757A (en) * | 2017-03-24 | 2017-08-18 | 金川集团股份有限公司 | A kind of production method of the separation of Silver from silver-containing liquid waste |
| CN111057864A (en) * | 2019-12-25 | 2020-04-24 | 苏州希图环保科技有限公司 | Process for recovering silver from waste liquid of photosensitive material |
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| CN102071319A (en) * | 2010-12-16 | 2011-05-25 | 惠州市奥美特环境科技有限公司 | Method for preparing high-purity silver from silver-containing waste liquid |
| US20140033870A1 (en) * | 2012-08-01 | 2014-02-06 | Chung Shan Institute Of Science And Technology | Method for separating metal nanoparticles from colloidal metal solution |
| CN107058757A (en) * | 2017-03-24 | 2017-08-18 | 金川集团股份有限公司 | A kind of production method of the separation of Silver from silver-containing liquid waste |
| CN111057864A (en) * | 2019-12-25 | 2020-04-24 | 苏州希图环保科技有限公司 | Process for recovering silver from waste liquid of photosensitive material |
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| 章道昆: "多种废液、废料中回收银", 《云南冶金》 * |
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