CA2033788A1 - Silver recovery from spent photographic solutions - Google Patents

Silver recovery from spent photographic solutions

Info

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
Application number
CA 2033788
Other languages
French (fr)
Other versions
CA2033788C (en
Inventor
Wasyl Kunda
Thomas H. Etsell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Alberta
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA 2033788 priority Critical patent/CA2033788C/en
Publication of CA2033788A1 publication Critical patent/CA2033788A1/en
Application granted granted Critical
Publication of CA2033788C publication Critical patent/CA2033788C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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.
CA 2033788 1991-01-08 1991-01-08 Silver recovery from spent photographic solutions Expired - Fee Related CA2033788C (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5884116A (en) * 1996-06-07 1999-03-16 Eastman Kodak Company Photographic processing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
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