Abstract
From the standpoints of environmental protection and nickel recycling, the development of an effective treatment method for spent electroless nickel plating baths is very important. We have been studying the recovery of nickel from the spent baths by continuous multistage solvent extraction and stripping process. High-extraction and stripping efficiencies of nickel using a mixer-settler were obtained. In this study, the continuous stripping data were quantitatively analyzed on the basis of the interfacial stripping rate equation considering the hydrodynamic properties in the mixer. The interfacial stripping rate constant of 7.3 x 10-10 m4/(s mol) was obtained. Finally, an engineering model was established for simulating the stripping efficiency of nickel during a multistage operation.
