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I found this article, but it was not helpful. The $\ce{In2O3}$ is probably amorphous. $\ce{HNO3}$ and $\ce{HCl}$ do not work. Any ideas?

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In case your question is about the recovery of indium from ITO, the following might be helpful:

In Recovery of indium from indium tin oxide by solvent extraction, published in Hydrometallurgy, 2011, 107, 56-61 (DOI), the abstract seems to suggest that $\ce{H2SO4}$ is more suitable than $\ce{HNO3}$. Furthermore, a solvent extraction scheme for indium, using di-(2-ethylhexyl)phosphoric acid (DEHPA) is proposed.

In Recovery of indium from used indium–tin oxide (ITO) targets, published in Hydrometallurgy, 2011, 105, 207-212 (DOI), the authors agree on using $\ce{H2SO4}$ (at 90 °C) and decrease the ymount of tin in solution by sulfide precipitation.

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  • $\begingroup$ Thak you a lot! I will try it. $\endgroup$ May 13, 2015 at 10:24
  • $\begingroup$ there will be definitely problem with the steel substrate, H2SO4 will attack it as well $\endgroup$ May 13, 2015 at 10:49
  • $\begingroup$ @JaroslavKotowski My pleasure! Is there a chance to use find an autoclave with at teflon inlay? In any case, good luck with the experiments! $\endgroup$ May 13, 2015 at 13:56

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