| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method by which an activation treatment can be performed by the addition of hydrochloric acid without using large-scale equipment while keeping an organic phase in each stage of an extraction stage to always an activated state, further, and the occurrence of clads can be suppressed even when a trace amount of solid component is incorporated in the extraction starting liquid in a solvent extraction stage for metal using an extraction starting liquid composed of a metal chloride aqueous solution and an organic solvent containing an amine based extraction agent. <P>SOLUTION: In an extraction stage composing a solvent extraction process, the organic solvent is fed as it is without performing activation treatment. Besides, the extraction starting liquid is fed after the addition of hydrochloric acid so as to satisfy the following requirement (1) or (2): the requirement (1) wherein, the concentration of free salt acid in the extraction starting liquid after the addition of the hydrochloric acid is 0.5 to 5 g/L, and the requirement (2) wherein, the pH of the extraction starting liquid after the addition of the hydrochloric acid is -0.5 to 0.5. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
