| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently and easily recover a metal, for example, copper from waste water, for example, a waste etching acid. SOLUTION: The reactive species which react cathodically at the potential nobler than the cathodic deposition potential of the metal to be recovered in a solution having the reactive species reacting cathodically at the potential nobler than the cathodic deposition potential of the metal to be recovered are changed to the form that the reactive species do not react electrochemically as a hydroxide or chelate matter, by which the metal to be recovered is cathodically deposited in the form of maintaining ionicity and reacting electrochemically.</p> |
