METHOD FOR RECOVERING INDIUM

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently recovering indium from high purity indium oxide-containing scrap generated at the time of producing an ITO sputtering target or after its use. SOLUTION: This method for recovering indium includes a stage in which ITO indium-containing scrap is dissolved with hydrochloric acid to form an indium chloride solution, a stage in which a sodium hydroxide aqueous solution is added to the indium chloride solution to remove tin contained in the scrap as tin hydroxide and a stage in which indium is substituted with zinc and recovered from the remaining solution freed of the tin hydroxide.