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| RELATIONSHIP BETWEEN SALTING-OUT EFFECT AND EXTRACTION MECHANISM DURING SOLVENT EXTRACTION OF TRANSITION METALS BY AMINES |
| YU Shuqiu; CHEN Jiayong (CHEN Chia-yung) (Institute of Chemical Metallurgy; Academia Sinica; Beijing) (Manuscript received 28 June; 1983) |
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Cite this article:
YU Shuqiu; CHEN Jiayong (CHEN Chia-yung) (Institute of Chemical Metallurgy; Academia Sinica; Beijing) (Manuscript received 28 June; 1983). RELATIONSHIP BETWEEN SALTING-OUT EFFECT AND EXTRACTION MECHANISM DURING SOLVENT EXTRACTION OF TRANSITION METALS BY AMINES. Acta Metall Sin, 1984, 20(6): 448-457.
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Abstract The effect of the presence of inorganic salts in aqueous phase on solvent extraction of metals by an extractant could be different during extraction with different mechanisms. The salting-out effect of the extraction of W(Ⅵ), MoⅥ),V(Ⅴ) and Cr(Ⅵ) by amines under anion-exchange and solvation mechanisms respectively was studied. During solvation extraction of oxyacids of transition metals by amines, hydrophilic complexes were formed first between them. The formation of these complexes depends greatly on the activity of water molecules in the aqueous phase. The addition of inorganic salts to the aqueous phase will decrease the activity of water molecules and thus decrease the extraction of metals into the organic phase. However, during extraction of metals by amine salts with anion-exchange mechanism, the presence of inorganic salts will diminish or prevent the formation of hydrophilic complexes in the simultaneous side reaction and thus increase the percent of metals extracted by the main anion-exchange reaction. Therefore, the extraction of transition metals by amines can be increased or decreased by the addition, of inorganic salts to the aqueous phase with anion-exchange and solvation extraction mechanisms respectively. Some new viewpoints about salting-out effect in solvent extraction were proposed.
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Received: 18 June 1984
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