CN1037916C - Method for recovering silver from waste liquor containing silver chloride - Google Patents
Method for recovering silver from waste liquor containing silver chloride Download PDFInfo
- Publication number
- CN1037916C CN1037916C CN95107479A CN95107479A CN1037916C CN 1037916 C CN1037916 C CN 1037916C CN 95107479 A CN95107479 A CN 95107479A CN 95107479 A CN95107479 A CN 95107479A CN 1037916 C CN1037916 C CN 1037916C
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- CN
- China
- Prior art keywords
- silver
- silver chloride
- waste liquid
- waste liquor
- ammoniacal liquor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
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- Removal Of Specific Substances (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The present invention relates to a method for recovering silver from the waste liquor of silver chloride, which comprises the following steps: an alkali solution is added into the waste liquor of silver chloride, and the solution is regulated to be alkaline and filtered; subsequently, ascorbic acid solid or a water solution is added; and after conversion, the product, namely silver, is obtained by filtering and washing silver precipitates. The method has the advantages of easy obtainment of raw materials, low cost, simple manufacturing process, high yield (more than 98%) and easy popularization and use. The method not only recovers valuable silver, but also solves environment pollution.
Description
The present invention relates to a kind of method that from the silver chloride waste liquid, reclaims silver.
At present, the silver chloride waste liquid that will produce during many chemical experiment units (comprising medicine inspecting institute) often will test is discarded, and major part is poured water drain into, not only causes the loss of silver, and pollutes to environment.Causing the depleted reason is that waste liquid quantity is few, and silver chloride itself is more stable, and treatment process is loaded down with trivial details, though the method that adopts zinc to extract silver from silver chloride is arranged, this method complexity must be removed unnecessary zinc, the high inadequately shortcoming of the rate of recovery.Therefore, be necessary to provide a kind of technology is easy, raw material the is easy to get high recovery method of the rate of recovery.
The object of the invention provides a kind of method that reclaims silver from the silver chloride waste liquid, and this method is easy, raw material is easy to get, rate of recovery height.
For achieving the above object, the present invention is by the following technical solutions: recovery method is to add alkaline solution in the silver chloride waste liquid, transfers to solution and is alkalescence, filters, add the xitix solid or the aqueous solution subsequently, transform the silver-colored throw out in back after filtration, washing obtains product silver.
Alkaline solution can be an ammoniacal liquor, and its concentration can be 17%, perhaps the ammoniacal liquor after the dilution, ammoniacal liquor for example: water=1: 1, dilution back ammoniacal liquor ratio is easier to control, and xitix can be with solid or its aqueous solution, concentration of aqueous solution is between 10-30%, generally about 20%.
Advantage of the present invention: adopt to become more readily available and cheap raw material, for example: alkaline solution adopts ammoniacal liquor, aqueous sodium hydroxide solution, reductive agent adopts xitix, whole technology is simple, silver raising recovery rate is more than 98%, be easy to promote the use of, adopt this technology both to reclaim valuable argent, reduce environmental pollution again.
The present invention is further described below in conjunction with embodiment and accompanying drawing
Fig. 1: a kind of recovery silver process block diagram provided by the invention
Fig. 2: provided by the invention another reclaims the silver process block diagram
Among Fig. 1,1 contains the silver chloride waste liquid, adds ammoniacal liquor in waste liquid, and wherein the silver chloride dissolving 2, the solution filter 23, remove precipitation, add xitix in the filtrate, transform 4, promptly silver ion reduction becomes silver metal, through filtering 5, obtain the silver precipitation, through washing 6, obtain product silver.Wherein between the concentration of the aqueous ascorbic acid control 10-30%, generally adopt 20% concentration, its purity, yield are more than 98%.
Among Fig. 2,7 contain the silver chloride waste liquid, add 10% aqueous sodium hydroxide solution and transfer pH value to 10-11, solution is filtered 9, add xitix in the precipitation and do to transform 10, the concentration of xitix is controlled at 10-30%, generally about 20%, be warmed up to 50-100 ℃ during conversion, help conversion reaction, solution is filtered 11, throw out is a silver, at this moment silver nitride precipitation changes grey black promptly about 99% above silver chloride reduction Cheng Yin into from white, just obtains product silver through washing 12 again.
Claims (3)
1, a kind of method that from the silver chloride waste liquid, reclaims silver, it is characterized in that it comprises following step: in the silver chloride waste liquid, add ammoniacal liquor, transfer to solution and be alkalescence, filter, add the xitix solid or the aqueous solution subsequently, transform the silver-colored throw out in back after filtration, washing obtains product silver.
2, by the described a kind of method that from the silver chloride waste liquid, reclaims silver of claim 1, it is characterized in that the ammoniacal liquor of described ammoniacal liquor, its ammoniacal liquor: water=1: 1 for diluting.
3, by claim 1 or 2 described a kind of methods that from the silver chloride waste liquid, reclaim silver, it is characterized in that described aqueous ascorbic acid concentration is about 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95107479A CN1037916C (en) | 1995-07-14 | 1995-07-14 | Method for recovering silver from waste liquor containing silver chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95107479A CN1037916C (en) | 1995-07-14 | 1995-07-14 | Method for recovering silver from waste liquor containing silver chloride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1122836A CN1122836A (en) | 1996-05-22 |
| CN1037916C true CN1037916C (en) | 1998-04-01 |
Family
ID=5076332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95107479A Expired - Fee Related CN1037916C (en) | 1995-07-14 | 1995-07-14 | Method for recovering silver from waste liquor containing silver chloride |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1037916C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100393898C (en) * | 2003-09-24 | 2008-06-11 | 苏州大学 | Method of recovering silver for silver-containing waste liquid |
| JP5354041B2 (en) * | 2012-02-24 | 2013-11-27 | 住友金属鉱山株式会社 | Silver powder manufacturing method |
| CN106702166A (en) * | 2017-02-06 | 2017-05-24 | 温州中希电工合金有限公司 | Method for recycling silver in high oil-bearing sludge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1012212B (en) * | 1987-03-06 | 1991-03-27 | 莫斯科“生物物理仪器”科学制造公司 | Lubricating device for hydrodynamic bearing |
-
1995
- 1995-07-14 CN CN95107479A patent/CN1037916C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1012212B (en) * | 1987-03-06 | 1991-03-27 | 莫斯科“生物物理仪器”科学制造公司 | Lubricating device for hydrodynamic bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1122836A (en) | 1996-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Applicant after: Tibet Autonomous Region Drug Examination Office Applicant before: Tibet Tibetan medicine natural medicine research center |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: TIBET TIBETAN MEDICINE RESEARCH CENTER OF NATURAL MEDICINES TO: TIBET AUTONOMOUS REGION DRUG TESTING INSTITUTE |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |