Recovery of Copper(II) and Nickel(II) from Plating Wastewater by Solvent Extraction

The solvent extraction technology was applied to recover Cu(2+) and Ni(2+) from plating wastewater. Lix984N was chosen as the extractant due to its good extraction performance. The influence parameters were examined. The results show that the separation of Cu(2+) and Ni(2+) from sulphate medium can be realized by adjusting pH value with the help of Lix984N. For extracting Cu(2+) and Ni(2+), the optimal pH values are 4 and 10.5, and the maximal extraction percentages are 92.9% and 93.0%, respectively. With recovered Cu(2+) and Ni(2+) stripped in 170 g.L(-1) and 200 g.L(-1) H(2)SO(4) medium, the stripping percentages of Cu(2+) and Ni(2+) are 92.9% and 93.0%, respectively. This method is simple and can be used to recover Cu(2+) and Ni(2+) from plating wastewater. And a flow sheet for separation of Cu(2+) and Ni(2+) is presented.