| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To collect high purity indium from an indium-containing substance such as the scrap of an ITO target, in a simple process. <P>SOLUTION: This collecting process comprises dissolving the indium-containing substance into hydrochloric acid; controlling the pH of the solution into a predetermined value between 0.5 and 4 by adding alkali, to precipitate and remove predetermined metal ions in the solution in a form of hydroxides; subsequently blowing hydrogen sulfide gas into the solution, to precipitate and remove metal ions harmful for electrolysis to be carried out in the next step in a form of sulfides; and then electrowinning indium metal by using the solution as an electrolytic solution. By the method, indium with purity of 99.999% or higher is collected from the scrap of the ITO target. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
