METHOD FOR COLLECTION OF VALUABLE METAL FROM ITO SCRAP

摘要

A method for collecting a valuable metal from an indium-tin oxide (ITO) scrap, characterized by collecting metal indium by the electrolysis of the ITO scrap; a method comprising conducting the electrolysis of the ITO scrap in an electrolytic bath partitioned by a septum or an ion exchange membrane, removing an anolyte temporarily, removing tin from the anolyte by a neutralization technique or a substitution technique, placing a solution produced by the removal of tin into the cathode side again, conducting the electrolysis of the solution, and collecting metal indium selectively; or a method for collecting a valuable metal from an ITO scrap, comprising preparing a solution containing In and Sn in an ITO-electrolyzing bath, removing Sn from the solution, and collecting In in the collecting bath. It becomes possible to provide a method for collecting metal indium at high efficiency from an ITO sputtering target or an ITO scrap (e.g., a ITO waste) produced during the production of the ITO sputtering target.