| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a solvent extraction method capable of enhancing the copper extraction rate when repeatedly using an extraction agent in an extraction process after back extraction, and also lowering a copper concentration in extraction residual liquid at the most so as to lower the load on copper removal thereafter, by selectively extracting cuprous ions from a chloride aqueous solution after reduction with the extraction agent containing tributyl phosphate, then reducing at the most the residual copper concentration in the extraction agent formed by back extraction, when separating copper and iron by a solvent extraction method in copper hydrometallurgy method. <P>SOLUTION: A regenerated extraction agent is obtained by selectively extracting cuprous ions from the chloride aqueous solution after reduction, then bringing the extraction agent formed by back extraction into contact with an aqueous solution containing chloride ions to be used as a regeneration starting liquid. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
