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