Extraction and separation of nickel(II) using bis(2,4,4-trimethylpentyl) dithiophosphinic acid (Cyanex 301) and its recovery from spent catalyst and electroplating bath residue

The paper embodies the details on the extraction behaviour of Ni(II) along with Cr(III), Fe(III), Mn(II), Co(II), Cu(II) and Zn(II) from sulfuric acid media employing Cyanex 301-toluene system. The effect of various parameter s like concentration of acid, metal ion and extractant and nature of diluen t on the extraction of Ni(II) has been studied. On the basis of the distrib ution data the extracting species has been proposed. The recycling capacity of the extractant has been assessed. Some binary and ternary separations h ave also been achieved. The practical utility of the extractant has been de monstrated by recovering Ni(II) from spent catalyst and electroplating bath residue.