CA2033788A1 - Silver recovery from spent photographic solutions - Google Patents
Silver recovery from spent photographic solutionsInfo
- Publication number
- CA2033788A1 CA2033788A1 CA 2033788 CA2033788A CA2033788A1 CA 2033788 A1 CA2033788 A1 CA 2033788A1 CA 2033788 CA2033788 CA 2033788 CA 2033788 A CA2033788 A CA 2033788A CA 2033788 A1 CA2033788 A1 CA 2033788A1
- Authority
- CA
- Canada
- Prior art keywords
- fixer
- solution
- silver
- fixer solution
- spent photographic
- 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.)
- Granted
Links
- 229910052709 silver Inorganic materials 0.000 title abstract 4
- 239000004332 silver Substances 0.000 title abstract 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title 1
- 238000011084 recovery Methods 0.000 title 1
- 238000000034 method Methods 0.000 abstract 3
- 229910052946 acanthite Inorganic materials 0.000 abstract 2
- 238000004064 recycling Methods 0.000 abstract 2
- XUARKZBEFFVFRG-UHFFFAOYSA-N silver sulfide Chemical compound [S-2].[Ag+].[Ag+] XUARKZBEFFVFRG-UHFFFAOYSA-N 0.000 abstract 2
- 229940056910 silver sulfide Drugs 0.000 abstract 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- RWSOTUBLDIXVET-UHFFFAOYSA-M hydrosulfide Chemical compound [SH-] RWSOTUBLDIXVET-UHFFFAOYSA-M 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/395—Regeneration of photographic processing agents other than developers; Replenishers therefor
- G03C5/3952—Chemical, mechanical or thermal methods, e.g. oxidation, precipitation, centrifugation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G5/00—Compounds of silver
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Removal Of Specific Substances (AREA)
Abstract
A process is disclosed for recovering silver sulfide from a spent photographic fixer solution, which contains silver. The process is particularly suited for treating the fixer solution in a manner which enables recycling of the solution giving rise to considerable reduction in cost of fixer solution and reduced environmental pollution. The process comprises introducing a hydrosulfide reagent into the fixer solution, which contains silver, to precipitate silver sulfide while maintaining pH and thiosulfate levels in the fixer to allow for reuse. The precipitate is isolated from the fixer solution to remove silver thereby and hence enable recycling of the fixer solution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2033788 CA2033788C (en) | 1991-01-08 | 1991-01-08 | Silver recovery from spent photographic solutions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2033788 CA2033788C (en) | 1991-01-08 | 1991-01-08 | Silver recovery from spent photographic solutions |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2033788A1 true CA2033788A1 (en) | 1992-07-09 |
CA2033788C CA2033788C (en) | 1996-12-10 |
Family
ID=4146778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2033788 Expired - Fee Related CA2033788C (en) | 1991-01-08 | 1991-01-08 | Silver recovery from spent photographic solutions |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2033788C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5884116A (en) * | 1996-06-07 | 1999-03-16 | Eastman Kodak Company | Photographic processing apparatus |
-
1991
- 1991-01-08 CA CA 2033788 patent/CA2033788C/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5884116A (en) * | 1996-06-07 | 1999-03-16 | Eastman Kodak Company | Photographic processing apparatus |
Also Published As
Publication number | Publication date |
---|---|
CA2033788C (en) | 1996-12-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |