Distribution and spectrophotometric studies were conducted in order to characterize and identify the nickel and cobalt complexes extracted by LIX63 (H2Ox). The extraction of these metals was found to proceed by a varied and complicated process. Nickel is initially extracted as Ni(HOx)2 which subsequently converts to Ni(HOx) (H2Ox) 2 + . The equilibrium position between these two complexes depends upon the pH of the adjacent aqueous phase. Formation of Ni(HOx)2 is favored at pH > 4.5 and conversion to Ni(HOx) (H2Ox) 2 + is favored at lower pH. These two extractable species may fit into a reaction scheme that also involves the complexes Ni(HOx)2(H2Ox) and Ni(H2Ox) 3 2+ . The extraction of cobalt by LIX63 first forms Co(HOx)2 which apparently slowly oxidizes to Co(HOx)2(H2Ox)+.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry