| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a technique for selectively separating silver from a mixture of silver and other metals and also efficiently recovering this silver. SOLUTION: In this method for separating and recovering silver, a solution containing silver is brought into contact with an extractant obtained by mixing a hydantoin compound having a specified prescribed substitutional group and higher alcohol, and silver is selectively extracted into the extractant. In this technique, preferably, silver is extracted in such a manner that the value of pH in the solution containing silver is controlled to the range of 5 to 7 in particular. Moreover, by this method, the extractant selectively extracted silver is brought into contact with an aqueous solution of nitric acid, so that silver can efficiently be stripped.</p> |
