Method for collection of valuable metal from ITO scrap

Details Method for collection of valuable metal from ITO scrap Method for collection of valuable metal from ITO scrap

2011-08-23

2011-08-23

Mayes, Melvin (Department: 1732)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iva metal

C205S544000, C205S564000, C423S089000, C423S111000, C423S115000

Reexamination Certificate

active

08003065

ABSTRACT:
Proposed is a method for collecting valuable metal from an ITO scrap including the steps of subjecting the ITO scrap to electrolysis in pH-adjusted electrolyte, and collecting indium or tin as oxides. Additionally proposed is a method for collecting valuable metal from an ITO scrap including the steps of subjecting the ITO scrap to electrolysis in an electrolytic bath partitioned with a diaphragm or an ion-exchange membrane to precipitate hydroxide of tin, thereafter extracting anolyte temporarily, and precipitating and collecting indium contained in the anolyte as hydroxide. With the methods for collecting valuable metal from an ITO scrap described above, indium or tin may be collected as oxides by roasting the precipitate containing indium or tin. Consequently, provided is a method for efficiently collecting indium from an ITO scrap of an indium-tin oxide (ITO) sputtering target or an ITO scrap such as ITO mill ends arisen during the manufacture of such ITO sputtering target.

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