HIGH-PURITY INDIUM, AND PRODUCTION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a method for producing high-purity In having 6N5 or higher purity at a low production cost by a wet method by using low-purity 4N In as a raw material.SOLUTION: The method for producing high-purity In comprises the steps of: using 4N(99.99%) In as an anode and sandblasted Ti plate as a cathode; and performing electrolytic refining in an electrolytic solution, to which sodium oxalate, NaCl and SrCOare added, to obtain high-purity In having 6N5(99.99995%) or higher purity as electrodeposited In on the cathode.SELECTED DRAWING: Figure 1