METHOD FOR SCRUBBING AN AMINE TYPE EXTRACTANT AFTER STRIPPING

摘要

The method for scrubbing an amine type extractant after stripping to be able to regenerate the same so that the amine type extractant can be repeatedly reused as it is in the extraction stage in the solvent extraction process, when an amine type extractant is regenerated by scrubbing an amine type extractant (A) containing an iron and a zinc chloro complex ion obtained by back extracting a cobalt with a hydrochloric acid aqueous solution from the amine type extractant after extracting a cobalt. The method is characterized by comprising the procedures of the following (1) to (3). (1) an amine type extractant (B) is obtained by adding an aqueous solution containing a sulfite ion to an amine type extractant (A) and stirring the mixture and reducing a ferric (III) chloro complex ion to divalent. (2) an amine type extractant (C) is obtained by adding an aqueous solution containing an oxidizing agent to the amine type extractant (B) and stirring the mixture and oxidizing a sulfite ion to sulfate ion. (3) an amine type extractant removed an iron and a zinc is obtained by adding an aqueous solution containing a chloride ion to the amine type extractant (C) and stirring the mixture and replacing a sulfate ion with chloride ion.