| 摘要 |
PURPOSE: To adsorb ruthenium on active carbon even if the content thereof is slight and to easily and inexpensively separate and recover the ruthenium from a soln. contg. the ruthenium held in an anion state by bringing the soln. into contact with the active carbon. CONSTITUTION: The ruthenium included in the soln., such as leaching liquid of nickel ore, is held in the anion state. Holding of this anion state is executed by setting the pH of the soln. and the oxidation reduction potential of a silver/ silver chloride electrode level to oxidation reduction potential of >=1.0V at >=pH3 or oxidation reduction potential of >=0.5V at >=pH2. The soln. of this state is brought into contact with the active carbon at ordinary temp. or by heating. As a result, the ruthenium in the soln. is nearly completely adsorbed on the active carbon and is recovered from the soln. even if the content thereof is an extremely slight level of aboutμg/l.
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