Three-stage batch extraction tests were performed on a multi-component sulphate solution containing equal amounts (1mol/m3) of Co (II), Ni (II), Zn (II), Cu (II) ions by using the Emulsion Liquid Membrane (ELM) technique. The mobile carrier 2-ethylhexyl phosphonic acid mono-2-ethylhexylester and polyamine surfactant were employed. Total contact time between emulsion and feed solution varied in the range 1.5 - 6 minutes for the extraction stages. The overall separation factors achieved in ELMs were: β Zn/Co =9, β Cu/Co = 1.9, and β Co/Ni = 42. These results are superior to the overall separation factors obtained from the corresponding multicomponent liquid-liquid extraction system. We found that the permeation rates of Co, Ni and Cu were interfacially controlled while Zn permeation was diffusion controlled. Further, we succeeded in demulsifying the emulsion membranes containing polyamine surfactant within 4 minutes by using an electric coalescer at 10 kilovolts and recovered the interior electrolyte at each stage. We have demonstrated that multistage separation of these metal ions from a multicomponent sulphate solution is practicable using recycled organic solution.
|Number of pages||13|
|Journal||Solvent Extraction Research and Development|
|Publication status||Published - Dec 1 1998|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)