SOLVENT EXTRACTION OF Ni(ll) WITH THE ACTIVE COMPONENT OF LIX 54

ABSTRACT

The solvent extraction of Ni(II) with the active component of the commercial extractant Lix 54 in different synergic mixtures, using tri-n-octylphosphine oxide (TOPO), tri-n-laurylamine (TLA), di-(2-ethylhexyl)phosphoric acid (HDEHP), tributylphosphate (TBP) and 4-methylpyridine as synergic reagents is compared in this work, the highest synergic effects corresponding to the presence of TOPO and 4-methylpyridine. For this reason, the extraction of Ni(ll) from a 1.0 mol.dnr³ KN0₃media by the mixture of the active component of Lix 54 and 4-methylpyridine has been extensively studied in this work. The results have been treated both graphically and numerically in order to find a suitable chemical model of the species responsible for the extraction as well as their extraction constants.