METHOD FOR RECOVERING HIGH PURITY INDIUM

摘要

The present invention relates to a method for recovering indium, comprising a first electrolysis of removing tin through a dry reduction to an indium-tin alloy under the atmosphere of inert gas from the indium scrap such as ITO waste target; a second electrolysis for highly purifying indium; and vacuum refining in which inflowed zinc is removed when electrolyzing. The present invention provides a method for recovering high-purity indium, comprising a reduction step where scraps containing indium oxide are reduced into alloy; molten salt- electrolyzing step where the alloy is used as an anode and InCl and ZnCl as electrolyte; and vacuum refining step where the refined indium melts obtained from the molten salt-electrolyzing step is treated in a vacuum cell to remove impurities having high vapor pressure. Since the recovering process of the present invention is only consisted of three different types of a simple dry process of recovering-electrolysis-vacuum refining, there is an advantage that it produces no waste water and 95% of recovery yield of indium can be attained with high productivity and low cost.