Abstract
A novel series of amido-functionalized amine reagents has been developed, which are designed for the extraction of anionic metal chloride complexes according to the following equation The new reagents were investigated for Zn(II), Co(II), and Fe(III) recovery in order to establish conditions under which the selectivity for base metals over Fe(III) could be achieved. They were found to be much stronger than the aliphatic amine benchmark extractant tris(2-ethylhexyl) amine (TEHA), giving good Zn(II) and Co(II) recovery from solutions with high enough pH to precipitate Fe(III). The new reagents also gave improved Zn(II) extraction from solutions with moderate to low chloride concentration so that the selectivity for Zn(II) over Fe(III) might be achieved at [Cl] < 1 M.
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