CN101086036A - Process for recovering silver from waste fixer solution - Google Patents
Process for recovering silver from waste fixer solution Download PDFInfo
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- CN101086036A CN101086036A CNA2007100216985A CN200710021698A CN101086036A CN 101086036 A CN101086036 A CN 101086036A CN A2007100216985 A CNA2007100216985 A CN A2007100216985A CN 200710021698 A CN200710021698 A CN 200710021698A CN 101086036 A CN101086036 A CN 101086036A
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- silver
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- waste fixer
- fixer solution
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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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Abstract
This invention discloses a process of recovering silver from waste fixing solution. It comprises following steps: adding the hydrolysate into waste fixing solution firstly, then adding enough strong alkali, stewing for stratification, filtering, washing the silver-containing residue repeatedly, and melting. The volume ratio of finxing solution and hydrolysate is 1: 0.1- 0.5; said hydrolysate is the mixing solution of sugar and oxalic acid, the weight ratio of water, sugar and oxalic acid is 100: 25-40: 3-10. Compared with existing technology, this invention is characterized by mild reaction condition, high silver recovery rate, and the purity of recovery silver can reach 99% after smelted.
Description
Technical field:
The invention belongs to the technology that reclaims silver in the waste fixer solution that from photo studio, color photo enlargement shop, hospital, printing house, is produced, belong to the technology that from waste fixer solution, reclaims silver with hydrolysis method especially.
Background technology:
Every liter of silver that contains the 3-11 gram in the waste fixer solution, raising along with international silver price, therefore the recovery of silver is also just more and more important in the waste fixer solution, silver in the waste fixer solution extracts with sodium sulphite and saltpetre earlier usually at present, smelt again, its principle is that thiosulfate ion is decomposed into sulphur and sulfur dioxide gas under the effect of acid, silver ions then is combined into silver sulfide with sulphur and precipitates, and then with the silver sulfide desulfurization, the saltpetre that uses in sweetening process is the main raw material of making explosive, and silver sulfide and saltpetre heating afterreaction produce a large amount of sulfurous gas white smoke, and violent burning is easy to generate blast.
Summary of the invention:
Technical problem to be solved by this invention provides a kind of technology that reclaims silver from waste fixer solution of reaction conditions gentleness.
The technical scheme of technical solution problem of the present invention is: a kind of technology that reclaims silver from waste fixer solution, add hydrolyzed solution at waste fixer solution earlier, the highly basic that adds capacity again, standing demix, filter, silver-colored wash heat is washed for several times, can smelt, the volume ratio of waste fixer solution and hydrolyzed solution is 1: 0.1-0.5;
Described hydrolyzed solution is the mixing solutions that contains sugar and oxalic acid, water: sugar: the weight ratio of oxalic acid is 100: 25-40: 3-10.
After preferably the hydrolyzed solution for preparing being heated to 60-100 ℃, cool to room temperature again is to increase the reductibility of hydrolyzed solution.
Described sugar is Portugal's glucose, white sugar, brown sugar.
Preferred sugar is white sugar.
Described highly basic is sodium hydroxide, potassium hydroxide.
Add the alkaline purpose and be to make silver-colored slag precipitation to separate out, as long as its add-on is for no longer separate out precipitation, when adding excessive highly basic, silver-colored slag sedimentation speed is accelerated, but whole silver is reclaimed not influence of technology.
The present invention utilizes sugar and oxalic acid generation reductibility in the hydrolyzed solution, rapidly precipitation is separated out and produced to the silver ions in the waste fixer solution under the alkaline effect, and the silver-colored slag that is settled out can directly be smelt silver ingot after cleaning.
The present invention compared with prior art, the reaction conditions gentleness, the rate of recovery height of silver, the silver after the recovery are after melting, its purity can reach 99%.
Description of drawings:
Fig. 1 is the schema of this technology.
Embodiment:
Non-limiting examples is as follows:
Embodiment 1:
Get 1 liter of waste fixer solution that contains 3.4 gram silver through silver-colored detection paper, add 0.1 liter of hydrolyzed solution, add the sodium hydroxide of 100 grams again, at this moment the color of waste fixer solution can become black by oyster white, leaves standstill 5-10 minute, the water of black can be divided into two-layer, can outwell the top not argentiferous water of that layer, also can directly pour into and filter out silver-colored slag in the filter cloth bag, then several times silver-colored slag water repetitive scrubbing, filtration can obtain silver-colored mud, utilizes prior art to smelt in silver-colored mud and gets final product.
Described hydrolyzed solution is the mixing solutions of water, glucose, oxalic acid, water: glucose: the weight ratio of oxalic acid is 100: 25: 3.
Silver mud weight is 3.2 grams, and the purity of smelting the silver that is 99.5%.
Embodiment 2:
Get 1 liter of waste fixer solution that contains 5.2 gram silver through silver-colored detection paper, add 0.25 liter of hydrolyzed solution, add the potassium hydroxide of 120 grams again, at this moment the color of waste fixer solution can become black by oyster white, leaves standstill 5-10 minute, the water of black can be divided into two-layer, can outwell the top not argentiferous water of that layer, also can directly pour into and filter out silver-colored slag in the filter cloth bag, then several times silver-colored slag water repetitive scrubbing, filtration can obtain silver-colored mud, utilizes prior art to smelt in silver-colored mud and gets final product.
Described hydrolyzed solution is the mixing solutions of water, white sugar, oxalic acid, water: white sugar: the weight ratio of oxalic acid is 100: 35: 7.
Silver mud weight is 5.1 grams, and the purity of smelting the silver that is 99.6%.
Embodiment 3:
Get 1 liter of waste fixer solution that contains 11 gram silver through silver-colored detection paper, add 0.5 liter of hydrolyzed solution, add the sodium hydroxide of 1 50 grams again, at this moment the color of waste fixer solution can become black by oyster white, leaves standstill 20 minutes, the water of black can be divided into two-layer, can outwell the top not argentiferous water of that layer, also can directly pour into and filter out silver-colored slag in the filter cloth bag, then several times silver-colored slag water repetitive scrubbing, filtration can obtain silver-colored mud, utilizes prior art to smelt in silver-colored mud and gets final product.
Described hydrolyzed solution is the mixing solutions of water, brown sugar, oxalic acid, water: brown sugar: the weight ratio of oxalic acid is 100: 40: 10.
Silver mud weight is 10.7 grams, and the purity of smelting the silver that is 99.7%.
Embodiment 4:
Remove before hydrolyzed solution uses and earlier hydrolyzed solution is heated to 60 ℃, be cooled to outside the room temperature again, all the other are identical with embodiment 2.
Silver mud weight is 5.16 grams, and the purity of smelting the silver that is 99.8%.
Embodiment 5:
Remove before hydrolyzed solution uses and earlier hydrolyzed solution is heated to 90 ℃, be cooled to outside the room temperature again, all the other are identical with embodiment 2.
Silver mud weight is 5.16 grams, and the purity of smelting the silver that is 99.7%.
Claims (5)
1, a kind of technology that reclaims silver from waste fixer solution is characterized in that: add hydrolyzed solution at waste fixer solution earlier, add the highly basic of capacity again, standing demix filters, and silver-colored wash heat is washed for several times, can smelt, the volume ratio of waste fixer solution and hydrolyzed solution is 1: 0.1-0.5;
Described hydrolyzed solution is the mixing solutions that contains sugar and oxalic acid, water: sugar: the weight ratio of oxalic acid is 100: 25-40: 3-10.
2, a kind of technology that reclaims silver from waste fixer solution according to claim 1 is characterized in that: after the hydrolyzed solution for preparing is heated to 60-100 ℃, and cool to room temperature again.
3, a kind of technology that reclaims silver from waste fixer solution according to claim 1, it is characterized in that: described sugar is Portugal's glucose, white sugar, brown sugar.
4, a kind of technology that reclaims silver from waste fixer solution according to claim 3, it is characterized in that: described sugar is white sugar.
5, a kind of technology that reclaims silver from waste fixer solution according to claim 1, it is characterized in that: described highly basic is sodium hydroxide, potassium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100216985A CN100467633C (en) | 2007-04-19 | 2007-04-19 | Process for recovering silver from waste fixer solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100216985A CN100467633C (en) | 2007-04-19 | 2007-04-19 | Process for recovering silver from waste fixer solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101086036A true CN101086036A (en) | 2007-12-12 |
| CN100467633C CN100467633C (en) | 2009-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100216985A Expired - Fee Related CN100467633C (en) | 2007-04-19 | 2007-04-19 | Process for recovering silver from waste fixer solution |
Country Status (1)
| Country | Link |
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| CN (1) | CN100467633C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352441A (en) * | 2011-10-21 | 2012-02-15 | 太原工业学院 | Method for recycling silver from waste fixer |
| CN102392137A (en) * | 2011-11-28 | 2012-03-28 | 太原工业学院 | Method for recovering silver from waste fixer by using acid as precipitant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1121989A (en) * | 1955-01-31 | 1956-08-29 | Leonar Werke Ag | Process for obtaining photographic images |
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2007
- 2007-04-19 CN CNB2007100216985A patent/CN100467633C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352441A (en) * | 2011-10-21 | 2012-02-15 | 太原工业学院 | Method for recycling silver from waste fixer |
| CN102392137A (en) * | 2011-11-28 | 2012-03-28 | 太原工业学院 | Method for recovering silver from waste fixer by using acid as precipitant |
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| Publication number | Publication date |
|---|---|
| CN100467633C (en) | 2009-03-11 |
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Granted publication date: 20090311 Termination date: 20110419 |