1. Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, 100190 Beijing, China
3. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 - Box 2450, 3001 Leuven, Belgium