Chemical Dissolution of Iridium Powder Using Alkali Fusion Followed by High-Temperature Leaching

초록

The dissolution of iridium has been investigated with an alkali fusion treatment with Na2O2 followed by leaching in HCl solution. Alkali fusion with Na2O2 allows Ir to be easily oxidized to IrO2, which is transformed to a high oxidation state through the binding of Na-Ir-O at 600 degrees C for 4 h. From the fused mixture, with molar ratio of 1 : 2.0 (1r : Na2O2), 1r can be leached completely at 130 degrees C using an HCl solution with a concentration above 3 M. Moreover, the leaching with 3 M HCl at 130 degrees C can dissolve Ir from the mixture that was fused at 600 degrees C, regardless of molar ratio of Na2O2. 1r can also be completely dissolved at 70 degrees C or less when the fused mixture has a 1 : 2.0 ratio. [doi:10.2320/matertrans.M2011202]

키워드