EP0596549A1 - Procédé et appareillage pour la récupération d'argent à partir des solutions photographiques en contenant - Google Patents

Procédé et appareillage pour la récupération d'argent à partir des solutions photographiques en contenant Download PDF

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Publication number
EP0596549A1
EP0596549A1 EP93202671A EP93202671A EP0596549A1 EP 0596549 A1 EP0596549 A1 EP 0596549A1 EP 93202671 A EP93202671 A EP 93202671A EP 93202671 A EP93202671 A EP 93202671A EP 0596549 A1 EP0596549 A1 EP 0596549A1
Authority
EP
European Patent Office
Prior art keywords
effluent
tank
solution
precipitate
triazine
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.)
Withdrawn
Application number
EP93202671A
Other languages
German (de)
English (en)
Inventor
Andrew James c/o KODAK LIMITED Sewell
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.)
Kodak Ltd
Eastman Kodak Co
Original Assignee
Kodak Ltd
Eastman Kodak Co
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 Kodak Ltd, Eastman Kodak Co filed Critical Kodak Ltd
Publication of EP0596549A1 publication Critical patent/EP0596549A1/fr
Withdrawn legal-status Critical Current

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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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
    • G03D3/02—Details of liquid circulation
    • G03D3/06—Liquid supply; Liquid circulation outside tanks
    • G03D3/065—Liquid supply; Liquid circulation outside tanks replenishment or recovery apparatus

Definitions

  • This invention relates to a method and apparatus for silver recovery from photographic processing solutions or effluent or overflow solutions therefrom.
  • the present invention has as its object a machine which is able to recover silver from photographic processing or effluent solutions efficiently and automatically without operator intervention.
  • an apparatus for the treatment of photographic effluent solutions comprising a tank for holding a solution of trimercapto-s-triazine or a water-soluble salt thereof; at least one effluent tank for holding overflow from a post-development photographic processing solution; a reaction and precipitate-conditioning vessel; means for determining when the or each effluent tank is filled to a predetermined extent; means for delivering the contents of an effluent tank and an appropriate amount of the trimercapto-s-triazine solution to the reaction and precipitate-conditioning vessel; and means for separating the insoluble silver compound from the treated solution after precipitation of an insoluble silver compound.
  • the post development processing solutions may, for example, be bleach and/or bleach-fix and/or fixer and/or stabiliser solutions and/or wash waters.
  • the present invention also provides a method of treating silver-containing photographic effluent solutions contained in an effluent tank which comprises reacting a batch of the effluent solution with an appropriate amount of a solution of trimercapto-s-triazine or a water-soluble salt thereof, precipitating an insoluble silver compound thereby, allowing the precipitate to be conditioned by holding it for sufficient time in the conditioning tank and separating the solid and liquid phases in an apparatus as described above.
  • the process is preferably triggered in response to a signal from an effluent tank level determining means indicating that the next batch of predetermined volume is ready to be processed.
  • the apparatus is controlled by a microprocessor.
  • the advantage of the present invention is that it allows easy automated silver recovery at a level of silver of 2ppm silver or below in the solution, little operator involvement and minimal power consumption.
  • trimercapto-s-triazine compound may be an alkali metal salt thereof, for example the trisodium or tripotassium salt.
  • trimercapto-s-triazine will include both the compound itself and salts thereof. These compounds are available from DEGUSSA.
  • the amount of trimercapto-s-triazine used will be based on the volume of solution to be treated and its origin (ie whether from a film or paper process) as its silver content will be known with sufficient accuracy. In this case it is convenient to have two effluent tanks, one from a film processor and the other from a paper processor. A third tank containing overflow from the stabiliser can also be used. In one embodiment of the present invention known volumes from each of the effluent tanks may be combined for silver recovery.
  • the silver content of the effluent can be determined by known means, for example by measuring its pAg with an suitable electrode.
  • TMT trisodium salt of tricmercapto- s-triazine
  • reaction and precipitate-conditioning vessel may be replaced by separate reaction and precipitate-conditioning vessels. This allows each vessel to be optimised for its purpose.
  • the vessel where the precipitation takes place is preferably fitted with a stirrer.
  • the effluent tank(s) are preferably fed from a larger collection tank fed by overflow from the processing tanks. This allows the effluent tank(s) to be filled with a fixed volume of liquid as soon as they are emptied. It is preferred in such a case that means are provided for transferring a predetermined volume of effluent from the collection tank to an effluent tank which is sufficient to substantially completely fill it. The effluent tank(s) will then be able to deliver the next batch of effluent of known volume as soon as the reaction vessel is free to process it.
  • the collection tank may have a volume of 15-20 litres, while the smaller tanks may have a volume of 0.2 to 3 litres, preferably 0.5 to 1.5 litres.
  • the contents of the sedimentation tank is transferred to a filter to separate the liquid and solid phases prior to disposal and silver recovery.
  • the liquid phase may optionally undergo further treatment or be reused in a processing solution.
  • liquid phase If the liquid phase is to be processed further it could be passed to an apparatus as described in PCT Specification EP92/01583 where it could be combined with developer effluent.
  • the present apparatus may also be designed on a larger scale to deal with effluent from a photofinishing laboratory.
  • the tank holding trimercapto-s-triazine solution (1) and effluent tanks (2) are arranged to deliver their contents flowing under gravity via valves (3) into combined reaction and precipitate-conditioning vessel (4) in which a stirrer (5) is provided.
  • the effluent tanks will contain overflow from the film fixer, paper fixer and wash water.
  • Each tank (2) can be fed from a different source whose average silver content is known, hence the amount of trimercapto-s-triazine can be calculated.
  • Tank (4) can have a volume in the range 10-20 litres, preferably 12-15 litres.
  • the residence time in tank (4) will be approaching 2 days.
  • the residence time can vary from from 1-5 hours, preferably 2-3 hours but has no upper limit.
  • the conditioning tank (4) contents will be separated.
  • microprocessor controlled the calculation is made by the system software and, when required, the pump (6) will be activated thus transferring the contents of tank (4) into the filter bag (7).
  • the preferred filter bags have mesh apertures of 0.2 to 2 I .Lm, preferably 0.5 to 1.0 am. The separation may take place under the influence of gravity over a period of several hours. After several cycles the filter bag will be changed and the separated solid sent for silver recovery by a refiner.
  • the apparatus will remove silver leaving no more than 2 ppm silver in the liquid phase.
  • tanks (1) and (2) carry out the same functions as above, as do pump (6), filter bag (7) and outlet (8).
  • a separate reaction vessel (9) is provided together with a recirculating pump (10) which is active during the precipitation step.
  • the fully reacted mixture will then pass to conditioning tank (4) so that the small particles will dissolve and reprecipitate on the larger grains. Separation of the solid and liquid phases will be carried out as described above in relation to Figure 1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Removal Of Specific Substances (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
EP93202671A 1992-09-17 1993-09-15 Procédé et appareillage pour la récupération d'argent à partir des solutions photographiques en contenant Withdrawn EP0596549A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9219675 1992-09-17
GB929219675A GB9219675D0 (en) 1992-09-17 1992-09-17 Method and apparatus for silver recovery from photographic processing solutions

Publications (1)

Publication Number Publication Date
EP0596549A1 true EP0596549A1 (fr) 1994-05-11

Family

ID=10722070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93202671A Withdrawn EP0596549A1 (fr) 1992-09-17 1993-09-15 Procédé et appareillage pour la récupération d'argent à partir des solutions photographiques en contenant

Country Status (4)

Country Link
EP (1) EP0596549A1 (fr)
JP (1) JPH06190377A (fr)
CA (1) CA2105416A1 (fr)
GB (1) GB9219675D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761276A2 (fr) * 1995-09-02 1997-03-12 Kodak Limited Appareil de séparation d'effluent en phase solide et liquide
US5728295A (en) * 1996-04-19 1998-03-17 Fuji Hunt Photographic Chemicals, Inc. Apparatus for removing metal ions and/or complexes containing metal ions from a solution

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2149546A1 (fr) * 1971-08-18 1973-03-30 Sankyo Kasei Kk
GB1411985A (en) * 1972-10-18 1975-10-29 Ilford Ltd Silver recovery process
FR2534900A1 (fr) * 1982-10-20 1984-04-27 Rehman Process Eng Procede de traitement des solutions de travail des industries photochimiques
EP0424820A1 (fr) * 1989-10-20 1991-05-02 Fuji Photo Film Co., Ltd. Remplissage d'une solution de traitement
WO1993002391A1 (fr) * 1991-07-20 1993-02-04 Kodak Limited Traitement des produits photographiques uses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2149546A1 (fr) * 1971-08-18 1973-03-30 Sankyo Kasei Kk
GB1411985A (en) * 1972-10-18 1975-10-29 Ilford Ltd Silver recovery process
FR2534900A1 (fr) * 1982-10-20 1984-04-27 Rehman Process Eng Procede de traitement des solutions de travail des industries photochimiques
EP0424820A1 (fr) * 1989-10-20 1991-05-02 Fuji Photo Film Co., Ltd. Remplissage d'une solution de traitement
WO1993002391A1 (fr) * 1991-07-20 1993-02-04 Kodak Limited Traitement des produits photographiques uses

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761276A2 (fr) * 1995-09-02 1997-03-12 Kodak Limited Appareil de séparation d'effluent en phase solide et liquide
EP0761276A3 (fr) * 1995-09-02 1998-01-28 Kodak Limited Appareil de séparation d'effluent en phase solide et liquide
US5728295A (en) * 1996-04-19 1998-03-17 Fuji Hunt Photographic Chemicals, Inc. Apparatus for removing metal ions and/or complexes containing metal ions from a solution
US5993668A (en) * 1996-04-19 1999-11-30 Fuji Hunt Photographic Chemicals, Inc. Method for removing metal ions and/or complexes containing metal ions from a solution

Also Published As

Publication number Publication date
JPH06190377A (ja) 1994-07-12
CA2105416A1 (fr) 1994-03-18
GB9219675D0 (en) 1992-10-28

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