GB916438A - A high current density silver recovery unit - Google Patents

A high current density silver recovery unit

Info

Publication number
GB916438A
GB916438A GB2824760A GB2824760A GB916438A GB 916438 A GB916438 A GB 916438A GB 2824760 A GB2824760 A GB 2824760A GB 2824760 A GB2824760 A GB 2824760A GB 916438 A GB916438 A GB 916438A
Authority
GB
United Kingdom
Prior art keywords
cathode
silver
anode
cell
fixing solutions
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
Application number
GB2824760A
Inventor
Duncan Campbell Britton
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
Original Assignee
Kodak Ltd
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 filed Critical Kodak Ltd
Priority to GB2824760A priority Critical patent/GB916438A/en
Publication of GB916438A publication Critical patent/GB916438A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

916,438. Regenerating photographic fixing solutions. KODAK Ltd. Aug. 10, 1961 [Aug. 15, 1960], No. 28247/60. Class 41. An electrolytic cell for the recovery of silver from used photographic fixing solutions, at high current densities, comprises a cylindrical anode, an outer concentric cathode of flexible metal sheet constrained to form a cylinder and tangential inlet and outlet orifices communicating with the annular space between the electrodes. Fixing solutions containing soluble thiosulphates, particularly of sodium and ammonium together, and complex compounds of silver are treated electrolytically at current densities up to 25 amps. per sq. ft. to regenerate the fixing solutions and recover the silver. The cell consists of a cylindrical case 1, detachable end-caps 2 and 3 and a central core 9 fabricated from a chemically-resistant electrically insulating material. A removable thin polished stainless steel sheet 4, constrained in a cylindrical shape against case 1 constitutes the cathode; the anode 10, 11 consists of a split sheet cylinder of titanium plated with platinum on its convex surface, supported against core 9 by a circumferentially wound thin nylon cord 13. The electrolyte is injected tangentially into the annular space between the anode and the cathode via tube 14 so that the rate of flow across the cathode surface is high, due to the helical path described by the solution in moving through the cell to discharge via tube 15, thus preventing the formation of silver sulphide. Silver deposited on the cathode separates from the unrolled non-constrained stainless steel sheet in a friable form. The cell may be made of polymethyl methacrylate using polished stainless steel sheet as cathode and a rolled cylinder of 26 S.W.G. titanium sheet as anode, plated externally with 0.0001 inch platinum.
GB2824760A 1960-08-15 1960-08-15 A high current density silver recovery unit Expired GB916438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2824760A GB916438A (en) 1960-08-15 1960-08-15 A high current density silver recovery unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2824760A GB916438A (en) 1960-08-15 1960-08-15 A high current density silver recovery unit

Publications (1)

Publication Number Publication Date
GB916438A true GB916438A (en) 1963-01-23

Family

ID=10272659

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2824760A Expired GB916438A (en) 1960-08-15 1960-08-15 A high current density silver recovery unit

Country Status (1)

Country Link
GB (1) GB916438A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959110A (en) * 1973-04-12 1976-05-25 Hydrospace Industries, Inc. Apparatus for silver recovery
US3985634A (en) * 1975-01-27 1976-10-12 Larson Kay R Electrolytic silver recovery apparatus
US4018658A (en) * 1974-12-26 1977-04-19 Merlin Industries, Inc. Electroplating of recoverable silver from photographic solutions and cell with current control means therefor
US4175026A (en) * 1976-07-16 1979-11-20 Litton Industrial Products, Inc. Electrolytic apparatus for recovering metal from solutions
US4302317A (en) * 1976-04-05 1981-11-24 Mock Karl J Means for recovering a precious metal from an electrolyte solution containing ions of said metal
GB2125825A (en) * 1982-08-16 1984-03-14 Metelec Co The Metal recovery
US5102522A (en) * 1990-12-10 1992-04-07 James Rivers Metal recovery apparatus
US5529672A (en) * 1991-02-14 1996-06-25 Material Research Pty. Ltd. Mineral recovery apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959110A (en) * 1973-04-12 1976-05-25 Hydrospace Industries, Inc. Apparatus for silver recovery
US4018658A (en) * 1974-12-26 1977-04-19 Merlin Industries, Inc. Electroplating of recoverable silver from photographic solutions and cell with current control means therefor
US3985634A (en) * 1975-01-27 1976-10-12 Larson Kay R Electrolytic silver recovery apparatus
US4302317A (en) * 1976-04-05 1981-11-24 Mock Karl J Means for recovering a precious metal from an electrolyte solution containing ions of said metal
US4175026A (en) * 1976-07-16 1979-11-20 Litton Industrial Products, Inc. Electrolytic apparatus for recovering metal from solutions
GB2125825A (en) * 1982-08-16 1984-03-14 Metelec Co The Metal recovery
US5102522A (en) * 1990-12-10 1992-04-07 James Rivers Metal recovery apparatus
US5529672A (en) * 1991-02-14 1996-06-25 Material Research Pty. Ltd. Mineral recovery apparatus

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