Process for recovery of indium from ITO scraps and metallurgic microstructures Academic Article uri icon

abstract

  • Indium (In) can be recycled economically from used indium tin oxide (ITO) target or ITO etching solution. This study offers an efficient and simple method for recovery of pure indium from used materials using hydrometallurgical and hot immersion processes. The hydrometallurgical method (displacement) can be used to obtain indium metal from ITO waste liquid, and a slag-making process during hot immersion is proposed to purify sponge indium above 99%. The effects of replacement agents and temperatures for replacement solution are discussed using microstructure measurements for illustration. Magnesium (Mg) has the lowest oxidation potential and can be easily removed by using either oxidization or vaporization. In contrast, tin needs to be detached from an indium plate before sponge indium can form. 2009 Elsevier B.V. All rights reserved.

published proceedings

  • MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS

author list (cited authors)

  • Hsieh, S., Chen, C., & Say, W. C.

citation count

  • 71

complete list of authors

  • Hsieh, Sheng-Jen||Chen, Chien-Chon||Say, Wen C

publication date

  • February 2009