METHOD FOR COLLECTION OF VALUABLE METAL FROM ITO SCRAP

摘要

Disclosed is a method for collecting a valuable metal from an indium-tin oxide (ITO) scrap, characterized by conducting the electrolysis of the ITO scrap in an pH-adjusted electrolyte solution to collect indium or tin in the form of an oxide. Also disclosed is a method for collecting a valuable metal from an ITO scrap, which comprises conducting the electrolysis of the ITO scrap in an electrolytic bath partitioned by a septum or an ion exchange membrane to precipitate tin hydroxide, removing an anolyte temporarily, causing the precipitation of indium contained in the anolyte in the form of a hydroxide, and collecting the hydroxide. In these methods, indium or tin may be collected in the form of an oxide by roasting the precipitate containing indium or tin. It becomes possible to provide a method for collecting 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.