Search International and National Patent Collections

1. (WO2014192581) METHOD AND DEVICE FOR TREATING IODINE-CONTAINING ETCHING SOLUTION WHICH CONTAINS Au

Pub. No.:    WO/2014/192581    International Application No.:    PCT/JP2014/063275
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Wed May 21 01:59:59 CEST 2014
IPC: C23F 1/46
C25C 1/00
C25C 1/20
Applicants: ASAHIPRETEC CORPORATION
アサヒプリテック株式会社
Inventors: FURUKATA, Chie
古堅 千絵
KOKUBO, Hironobu
小久保 広宣
Title: METHOD AND DEVICE FOR TREATING IODINE-CONTAINING ETCHING SOLUTION WHICH CONTAINS Au
Abstract:
The purpose of the present invention is to establish a technique which enables the collection of Au from a used iodine-containing etching solution with a high collection rate and also enables the restoring of the concentration of iodine (I3-) in the etching solution to recover the etching ability of the etching solution. A method for treating a iodine-containing etching solution that contains Au, which comprises electrolyzing the etching solution to collect Au from the etching solution and restore the concentration of iodine (I3-), wherein the electrolysis is carried out while keeping the cathode potential at -0.7 V or more (wherein the reference potential is a potential of a reference electrode Ag/AgCl) and the anode potential at +1.0 V or less (wherein the reference potential is a potential of a reference electrode Ag/AgCl).