| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of leaching desired noble metals from a sample containing a plurality of noble metals. <P>SOLUTION: In the method of leaching noble metals consisting of at least two stages, halogenated oxoacids respectively different in oxidation stages are used, or halogenated oxoacid of the same type is used in the two stages, and the concentration thereof is changed. Namely, the method consists of a first stage where a sample containing a plurality of noble metals is leached with a leach liquor mainly consisting of the alkali metal salt of hypohalous acid or halous acid and the alkali metal salt of the acid of the halogen, and a second stage where solid which has not been dissolved in the first stage is leached with a leach liquor mainly consisting of the alkali metal salt of halogen acid or perhalogen acid and the acid of the halogen. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
