Title:
A silver recovery method
Document Type and Number:
Japanese Patent JP6159297
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To recover silver from a substrate coated with silver or a silver alloy at low costs while reducing the load on the environment.SOLUTION: A silver recovery method includes a dissolving removal step of adding a solution containing iron (III) nitrate to a substrate coated with silver or a silver-based alloy to dissolve silver or the silver-based alloy, a silver chloride formation step of adding hydrochloric acid to the solution dissolved with silver or the silver alloy to form precipitation of silver chloride and an iron nitrate regeneration step of oxidizing divalent iron ion contained in the solution after the dissolution removal step to trivalent iron ion. In the dissolution removal step, the concentrations of iron ions are kept so that the concentration of Fein the solution containing iron (III) nitrate after the addition of the substrate 1.5 times the concentration of Fe, and the solution containing iron (III) nitrate produced in the iron nitrate regeneration step is used in the dissolution removal step.
Inventors:
Naoko Kikuta
Satoshi Asano
Toshiro Tan
Satoshi Asano
Toshiro Tan
Application Number:
JP2014128675A
Publication Date:
July 05, 2017
Filing Date:
June 23, 2014
Export Citation:
Assignee:
Sumitomo Metal Mining Co., Ltd.
Oguchi Electronics Co., Ltd.
Oguchi Electronics Co., Ltd.
International Classes:
C22B11/00; B09B3/00; C22B3/04; C22B3/44; C22B7/00
Domestic Patent References:
| JP2159324A |
Attorney, Agent or Firm:
Akira Koike
Seiji Iga
Seiji Iga
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