Title:
METHOD FOR RECOVERING AU FROM IODINE ETCHING WASTE LIQUID AND REGENERATING ETCHING SOLUTION
Document Type and Number:
WIPO Patent Application WO/2018/150811
Kind Code:
A1
Abstract:
A method for electrolytic recovery of Au from a used Au-containing iodine etching solution and regenerating said etching solution characterized in that: the electric potential of the negative electrode is set to be -0.75 V to -0.95 V (reference electrode: Ag/AgCl); and the ratio of the positive electrode current density to the negative electrode current density is set to be 3-50 (exclusive of 3). The present invention addresses the problem of providing a method (a method for recovering Au and regenerating said iodine etching solution) for stably and efficiently processing a used iodine etching liquid without performing strict pH control.
Inventors:
SATO KENGO (JP)
Application Number:
PCT/JP2018/001580
Publication Date:
August 23, 2018
Filing Date:
January 19, 2018
Export Citation:
Assignee:
MATSUDA SANGYO COMPANY LTD (JP)
International Classes:
C25C1/20; C23F1/46; C25C1/00
Domestic Patent References:
| WO2014192581A1 | 2014-12-04 |
Foreign References:
| JPS60177192A | 1985-09-11 | |||
| JPH01184281A | 1989-07-21 | |||
| JP2003105570A | 2003-04-09 |
Attorney, Agent or Firm:
OGOSHI Kazuteru et al. (JP)
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