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the present invention is thus directed to a process for recovering substantially pure silver from silver-bearing scrap material which comprises immersing an anode of said scrap material and a cathode of a corrosion-resistant material in an electrolyte comprising an aqueous solution of silver sulfamate, a glutamic acid compound selected from the group consisting of glutamic acid and …
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The contacting is carried out for a sufficient time to reduce the concentration of silver in the developer solution to a desired level. The method is used in the treatment of a photographic...
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A method for treating a polymetallic sulfide ore containing gold and/or silver, and further containing base metals selected from the group consisting of iron, aluminum, chromium, titanium, copper, zinc, lead, nickel, cobalt, mercury, tin, and mixtures thereof, is disclosed. The method comprises the steps of grinding the polymetallic sulfide ore to produce granules, oxidizing the …
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A process is described which improves the life of a silver recovery unit which employs finely divided iron and a minor amounts of a copper or cadmium salt therein by raising the pH of waste acidic photographic processing stream containing silver to be recovered. This pH increase may be accomplished using waste developer stream. An additional use of a chelating agent has been …
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US-4632701-A chemical patent summary. A process for the recovery of silver from a residue essentially free of elemental sulphur obtained by acidic pressure oxidation leaching or iron-containing sulphidic material which comprises forming a slurry of the residue with lime at a temperature of at least about 80 DEG C. to raise the pH of the slurry to at least about 9.
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European Patent Office Prior art keywords silver solution recovery element physical development silver recovery 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 - Lifetime
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WO1993000611A1 - Silver recovery element and process - Google Patents Silver recovery element and process Download PDF Info Publication number ... Priority to JP50169393A priority Critical patent/JP3174331B2/ja Priority to DE69223493T priority patent/DE69223493T2/de
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Silver-bearing manufactured organic products such as photographic film, photographic paper, printed circuit boards, etc., are loaded into a reduction zone of a retort and pyrolyzed by hot non-oxidizing gases produced by the burning of the carbon residue of previously pyrolyzed organic products in an adjacent oxidation zone in the same retort.
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US2934429A - Silver recovery process - Google Patents Silver recovery process Download PDF Info Publication number US2934429A ... Priority to US592503A priority Critical patent/US2934429A/en Application granted granted Critical
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My present invention relates to a process for recovering i.e. extracting high purity silver metal from copper-electrolysis anode sludge and, more particularly, to a hydrometallurgical process...
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Silver recovery process Download PDF Info Publication number US3649250A. ... Publication of US3649250A publication Critical patent/US3649250A/en Anticipated expiration legal-status Critical Status Expired - Lifetime …
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Definitions. the invention relates to an electrolytic silver refining process in which crude silver is anodically dissolved and refined silver is cathodically deposited and at the same time accompanying metals are selectively extracted from the spent electrolyte and separately cathodically deposited after having been transferred into an aqueous phase, and the …
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The present invention according provides a method of recovering silver from silver containing halide solutions, comprising the steps of:(a) providing an ion exchange column comprising a weak anion exchange resin; (b) introducing the silver containing halide solution to the ion exchange column to absorb silver in the weak anion exchange resin; (c) washing the loaded ion …
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The invention relates to a process for recovering silver metal from an ionic silver-bearing spent photographic solution; and in an especially preferred embodiment exploits reduction of silver …
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Silver recovery process Download PDF Info Publication number US3537986A. ... Publication of US3537986A publication Critical patent/US3537986A/en Anticipated expiration legal-status Critical Status Expired - Lifetime …
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the instant invention relates to an element and a process for recovering silver from a photographic developer solution containing silver ion. a silver recovery element comprising a support having a hydrophilic colloid layer containing physical development nuclei on …
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We found a silver plated dish 10.5 inche diameter that had a thick coating of silver plate. I made a video and dissolved the entire plate using 900ml of concentrated nitric acid. Then I filtered and precipitated the silver chloride …
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By utilizing FeCl 3 under basic (pH 8) conditions, it causes the colloidal silver and silver halides to coagulate and drop out, speeding up this silver recovery process. the Eastman-Kodak...
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WO1993000610A1 - Silver recovery process - Google Patents Silver recovery process Download PDF Info Publication number ... Priority to DE1992624359 priority patent/DE69224359T2/de Publication of WO1993000610A1 publication Critical patent/WO1993000610A1/en Links. Espacenet;
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A process is provided for recovering silver and plastics material from photographic film. For exposed film, film is shredded or chopped, subjected to bleach treatment, washed, and subjected to fixing treatment, the fixing solution being circulated in closed circuit through an electrolytic silver recovery plant in which silver is deposited on one or more cathodes.
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US5188662A - Silver recovery process - Google Patents Silver recovery process Download PDF Info Publication number ... Priority to US07/724,577 priority Critical patent/US5188662A/en Assigned to EASTMAN KODAK COMPANY A CORP. OF NJ reassignment EASTMAN ...
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The contacting is carried out for a time sufficient to reduce the silver concentration in the developer solution to a desired level. The process is useful for treating a seasoned or …
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A process for removing silver from a silver containing photoprocessing solution, comprising the steps of: a) mixing a mercapto-s-triazine, or a water soluble salt thereof, with the solution thereby causing formation of a mixture of i) precipitates and fines of silver mercapto-s-triazine and ii) the solution; b) mixing a copolymer flocculant with the mixture thereby causing flocculation and ...
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A process for removing silver from a silver containing photoprocessing solution, including the steps of:a) mixing a mercapto-s-triazine, or a water soluble salt thereof, with the solution thereby causing formation of a mixture of i) precipitates and fines of silver mercapto-s-triazine and ii) the solution;b) mixing a copolymer flocculant with the mixture thereby causing flocculation and ...
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Accurate In a chemical process for recovering the silver contained in sensitive materials, it is possible to extract a significant quantity of all the silver halides from the plastic support. The process involves emulsifying the silver product in a chemical solution by agitating the mixture to extract the silver halides. The silver mud is then filtered, dried and refined.
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A process as claimed in claim 7 wherein the amount of water added to precipitate the silver chloride is selected to optimise the following factors, low solution volume for filtration and distillation, low water which must be recovered by distillation, high recovery of silver chloride, negligible precipitation of other chlorides and acceptable ...
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Silver recovery element and process Download PDF Info Publication number US5210009A. ... Priority to US07/724,393 priority Critical patent/US5210009A/en Assigned to EASTMAN KODAK COMPANY A CORP. OF NEW JERSEY reassignment ...
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Recovery of silver and silver recycling is accomplished using various methods, including the Parkes process, cupellation, parting, slag fuming, and electrolysis (electrorefining and electrowinning). Silver is most often recovered from low …
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Hydrometallurgical process for the recovery of silver from copper electrolysis anode sludge JPH02294495A (en) * : : Dowa Mining Co Ltd: Purified solution for obtaining ultrahigh purity copper and electrolyzing method ... PATENT ABSTRACTS OF JAPAN vol. 015, no. 068 (C - 0807) 18 February 1991 () *
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the silver to be recovered may be present in different forms: as insoluble silver halide, a soluble silver thiosulfate complex, a silver ion, or elemental silver, depending upon the type of process and the stage at which it is recovered. Much has been accomplished in recovering silver from photographic processing solutions, and the recovery rate can go as high as 98% and above.
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