| abstract |
According to the present invention, it becomes possible to collect ruthenium or a ruthenium compound, which is expensive, with high efficiency even from an aqueous solution containing a water-soluble salt, a lower alcohol, an organic acid or the like by adding at least one specific inorganic adsorbent to an aqueous solution containing ruthenium or the ruthenium compound, dissolving the entire or a portion of the inorganic adsorbent under acidic conditions, and adding an alkali to the solution to adjust the pH value of the solution to an alkaline pH value of 7 or more to thereby adsorb the ruthenium compound onto the inorganic adsorbent while precipitating the inorganic adsorbent. |